如何使用docker compose一键部署redis服务

mkdir /data/redis/  -p && cd /data/redis

version: '3'
services:
  redis:
    image: registry.cn-hangzhou.aliyuncs.com/xiaopangpang/redis:7.0.5
    container_name: redis
    restart: always
    environment:
      tz: asia/shanghai
      lang: en_us.utf-8
    ports:
      - "6379:6379"
    volumes:
      - "./redis/data:/data"
      - "./redis/config/redis.conf:/etc/redis/redis.conf"
    command: redis-server /etc/redis/redis.conf --requirepass 123456 --appendonly yes

# redis configuration file example.
#
# note that in order to read the configuration file, redis must be
# started with the file path as first argument:
#
# ./redis-server /path/to/redis.conf

# note on units: when memory size is needed, it is possible to specify
# it in the usual form of 1k 5gb 4m and so forth:
#
# 1k => 1000 bytes
# 1kb => 1024 bytes
# 1m => 1000000 bytes
# 1mb => 1024*1024 bytes
# 1g => 1000000000 bytes
# 1gb => 1024*1024*1024 bytes
#
# units are case insensitive so 1gb 1gb 1gb are all the same.

################################## includes ###################################

# include one or more other config files here.  this is useful if you
# have a standard template that goes to all redis servers but also need
# to customize a few per-server settings.  include files can include
# other files, so use this wisely.
#
# note that option "include" won't be rewritten by command "config rewrite"
# from admin or redis sentinel. since redis always uses the last processed
# line as value of a configuration directive, you'd better put includes
# at the beginning of this file to avoid overwriting config change at runtime.
#
# if instead you are interested in using includes to override configuration
# options, it is better to use include as the last line.
#
# included paths may contain wildcards. all files matching the wildcards will
# be included in alphabetical order.
# note that if an include path contains a wildcards but no files match it when
# the server is started, the include statement will be ignored and no error will
# be emitted.  it is safe, therefore, to include wildcard files from empty
# directories.
#
# include /path/to/local.conf
# include /path/to/other.conf
# include /path/to/fragments/*.conf
#

################################## modules #####################################

# load modules at startup. if the server is not able to load modules
# it will abort. it is possible to use multiple loadmodule directives.
#
# loadmodule /path/to/my_module.so
# loadmodule /path/to/other_module.so

################################## network #####################################

# by default, if no "bind" configuration directive is specified, redis listens
# for connections from all available network interfaces on the host machine.
# it is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more ip addresses.
# each address can be prefixed by "-", which means that redis will not fail to
# start if the address is not available. being not available only refers to
# addresses that does not correspond to any network interface. addresses that
# are already in use will always fail, and unsupported protocols will always be
# silently skipped.
#
# examples:
#
# bind 192.168.1.100 10.0.0.1     # listens on two specific ipv4 addresses
# bind 127.0.0.1 ::1              # listens on loopback ipv4 and ipv6
# bind * -::*                     # like the default, all available interfaces
#
# ~~~ warning ~~~ if the computer running redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. so by default we uncomment the
# following bind directive, that will force redis to listen only on the
# ipv4 and ipv6 (if available) loopback interface addresses (this means redis
# will only be able to accept client connections from the same host that it is
# running on).
#
# if you are sure you want your instance to listen to all the interfaces
# comment out the following line.
#
# you will also need to set a password unless you explicitly disable protected
# mode.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# 注释允许外部访问redis
# bind 127.0.0.1 -::1

# by default, outgoing connections (from replica to master, from sentinel to
# instances, cluster bus, etc.) are not bound to a specific local address. in
# most cases, this means the operating system will handle that based on routing
# and the interface through which the connection goes out.
#
# using bind-source-addr it is possible to configure a specific address to bind
# to, which may also affect how the connection gets routed.
#
# example:
#
# bind-source-addr 10.0.0.1

# protected mode is a layer of security protection, in order to avoid that
# redis instances left open on the internet are accessed and exploited.
#
# when protected mode is on and the default user has no password, the server
# only accepts local connections from the ipv4 address (127.0.0.1), ipv6 address
# (::1) or unix domain sockets.
#
# by default protected mode is enabled. you should disable it only if
# you are sure you want clients from other hosts to connect to redis
# even if no authentication is configured.
protected-mode yes

# redis uses default hardened security configuration directives to reduce the
# attack surface on innocent users. therefore, several sensitive configuration
# directives are immutable, and some potentially-dangerous commands are blocked.
#
# configuration directives that control files that redis writes to (e.g., 'dir'
# and 'dbfilename') and that aren't usually modified during runtime
# are protected by making them immutable.
#
# commands that can increase the attack surface of redis and that aren't usually
# called by users are blocked by default.
#
# these can be exposed to either all connections or just local ones by setting
# each of the configs listed below to either of these values:
#
# no    - block for any connection (remain immutable)
# yes   - allow for any connection (no protection)
# local - allow only for local connections. ones originating from the
#         ipv4 address (127.0.0.1), ipv6 address (::1) or unix domain sockets.
#
# enable-protected-configs no
# enable-debug-command no
# enable-module-command no

# accept connections on the specified port, default is 6379 (iana #815344).
# if port 0 is specified redis will not listen on a tcp socket.
port 6379

# tcp listen() backlog.
#
# in high requests-per-second environments you need a high backlog in order
# to avoid slow clients connection issues. note that the linux kernel
# will silently truncate it to the value of /proc/sys/net/core/somaxconn so
# make sure to raise both the value of somaxconn and tcp_max_syn_backlog
# in order to get the desired effect.
tcp-backlog 511

# unix socket.
#
# specify the path for the unix socket that will be used to listen for
# incoming connections. there is no default, so redis will not listen
# on a unix socket when not specified.
#
# unixsocket /run/redis.sock
# unixsocketperm 700

# close the connection after a client is idle for n seconds (0 to disable)
timeout 0

# tcp keepalive.
#
# if non-zero, use so_keepalive to send tcp acks to clients in absence
# of communication. this is useful for two reasons:
#
# 1) detect dead peers.
# 2) force network equipment in the middle to consider the connection to be
#    alive.
#
# on linux, the specified value (in seconds) is the period used to send acks.
# note that to close the connection the double of the time is needed.
# on other kernels the period depends on the kernel configuration.
#
# a reasonable value for this option is 300 seconds, which is the new
# redis default starting with redis 3.2.1.
tcp-keepalive 300

# apply os-specific mechanism to mark the listening socket with the specified
# id, to support advanced routing and filtering capabilities.
#
# on linux, the id represents a connection mark.
# on freebsd, the id represents a socket cookie id.
# on openbsd, the id represents a route table id.
#
# the default value is 0, which implies no marking is required.
# socket-mark-id 0

################################# tls/ssl #####################################

# by default, tls/ssl is disabled. to enable it, the "tls-port" configuration
# directive can be used to define tls-listening ports. to enable tls on the
# default port, use:
#
# port 0
# tls-port 6379

# configure a x.509 certificate and private key to use for authenticating the
# server to connected clients, masters or cluster peers.  these files should be
# pem formatted.
#
# tls-cert-file redis.crt
# tls-key-file redis.key
#
# if the key file is encrypted using a passphrase, it can be included here
# as well.
#
# tls-key-file-pass secret

# normally redis uses the same certificate for both server functions (accepting
# connections) and client functions (replicating from a master, establishing
# cluster bus connections, etc.).
#
# sometimes certificates are issued with attributes that designate them as
# client-only or server-only certificates. in that case it may be desired to use
# different certificates for incoming (server) and outgoing (client)
# connections. to do that, use the following directives:
#
# tls-client-cert-file client.crt
# tls-client-key-file client.key
#
# if the key file is encrypted using a passphrase, it can be included here
# as well.
#
# tls-client-key-file-pass secret

# configure a dh parameters file to enable diffie-hellman (dh) key exchange,
# required by older versions of openssl (<3.0). newer versions do not require
# this configuration and recommend against it.
#
# tls-dh-params-file redis.dh

# configure a ca certificate(s) bundle or directory to authenticate tls/ssl
# clients and peers.  redis requires an explicit configuration of at least one
# of these, and will not implicitly use the system wide configuration.
#
# tls-ca-cert-file ca.crt
# tls-ca-cert-dir /etc/ssl/certs

# by default, clients (including replica servers) on a tls port are required
# to authenticate using valid client side certificates.
#
# if "no" is specified, client certificates are not required and not accepted.
# if "optional" is specified, client certificates are accepted and must be
# valid if provided, but are not required.
#
# tls-auth-clients no
# tls-auth-clients optional

# by default, a redis replica does not attempt to establish a tls connection
# with its master.
#
# use the following directive to enable tls on replication links.
#
# tls-replication yes

# by default, the redis cluster bus uses a plain tcp connection. to enable
# tls for the bus protocol, use the following directive:
#
# tls-cluster yes

# by default, only tlsv1.2 and tlsv1.3 are enabled and it is highly recommended
# that older formally deprecated versions are kept disabled to reduce the attack surface.
# you can explicitly specify tls versions to support.
# allowed values are case insensitive and include "tlsv1", "tlsv1.1", "tlsv1.2",
# "tlsv1.3" (openssl >= 1.1.1) or any combination.
# to enable only tlsv1.2 and tlsv1.3, use:
#
# tls-protocols "tlsv1.2 tlsv1.3"

# configure allowed ciphers.  see the ciphers(1ssl) manpage for more information
# about the syntax of this string.
#
# note: this configuration applies only to <= tlsv1.2.
#
# tls-ciphers default:!medium

# configure allowed tlsv1.3 ciphersuites.  see the ciphers(1ssl) manpage for more
# information about the syntax of this string, and specifically for tlsv1.3
# ciphersuites.
#
# tls-ciphersuites tls_chacha20_poly1305_sha256

# when choosing a cipher, use the server's preference instead of the client
# preference. by default, the server follows the client's preference.
#
# tls-prefer-server-ciphers yes

# by default, tls session caching is enabled to allow faster and less expensive
# reconnections by clients that support it. use the following directive to disable
# caching.
#
# tls-session-caching no

# change the default number of tls sessions cached. a zero value sets the cache
# to unlimited size. the default size is 20480.
#
# tls-session-cache-size 5000

# change the default timeout of cached tls sessions. the default timeout is 300
# seconds.
#
# tls-session-cache-timeout 60

################################# general #####################################

# by default redis does not run as a daemon. use 'yes' if you need it.
# note that redis will write a pid file in /var/run/redis.pid when daemonized.
# when redis is supervised by upstart or systemd, this parameter has no impact.
daemonize no

# if you run redis from upstart or systemd, redis can interact with your
# supervision tree. options:
#   supervised no      - no supervision interaction
#   supervised upstart - signal upstart by putting redis into sigstop mode
#                        requires "expect stop" in your upstart job config
#   supervised systemd - signal systemd by writing ready=1 to $notify_socket
#                        on startup, and updating redis status on a regular
#                        basis.
#   supervised auto    - detect upstart or systemd method based on
#                        upstart_job or notify_socket environment variables
# note: these supervision methods only signal "process is ready."
#       they do not enable continuous pings back to your supervisor.
#
# the default is "no". to run under upstart/systemd, you can simply uncomment
# the line below:
#
# supervised auto

# if a pid file is specified, redis writes it where specified at startup
# and removes it at exit.
#
# when the server runs non daemonized, no pid file is created if none is
# specified in the configuration. when the server is daemonized, the pid file
# is used even if not specified, defaulting to "/var/run/redis.pid".
#
# creating a pid file is best effort: if redis is not able to create it
# nothing bad happens, the server will start and run normally.
#
# note that on modern linux systems "/run/redis.pid" is more conforming
# and should be used instead.
pidfile /var/run/redis_6379.pid

# specify the server verbosity level.
# this can be one of:
# debug (a lot of information, useful for development/testing)
# verbose (many rarely useful info, but not a mess like the debug level)
# notice (moderately verbose, what you want in production probably)
# warning (only very important / critical messages are logged)
loglevel notice

# specify the log file name. also the empty string can be used to force
# redis to log on the standard output. note that if you use standard
# output for logging but daemonize, logs will be sent to /dev/null
logfile ""

# to enable logging to the system logger, just set 'syslog-enabled' to yes,
# and optionally update the other syslog parameters to suit your needs.
# syslog-enabled no

# specify the syslog identity.
# syslog-ident redis

# specify the syslog facility. must be user or between local0-local7.
# syslog-facility local0

# to disable the built in crash log, which will possibly produce cleaner core
# dumps when they are needed, uncomment the following:
#
# crash-log-enabled no

# to disable the fast memory check that's run as part of the crash log, which
# will possibly let redis terminate sooner, uncomment the following:
#
# crash-memcheck-enabled no

# set the number of databases. the default database is db 0, you can select
# a different one on a per-connection basis using select <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 16

# by default redis shows an ascii art logo only when started to log to the
# standard output and if the standard output is a tty and syslog logging is
# disabled. basically this means that normally a logo is displayed only in
# interactive sessions.
#
# however it is possible to force the pre-4.0 behavior and always show a
# ascii art logo in startup logs by setting the following option to yes.
always-show-logo no

# by default, redis modifies the process title (as seen in 'top' and 'ps') to
# provide some runtime information. it is possible to disable this and leave
# the process name as executed by setting the following to no.
set-proc-title yes

# when changing the process title, redis uses the following template to construct
# the modified title.
#
# template variables are specified in curly brackets. the following variables are
# supported:
#
# {title}           name of process as executed if parent, or type of child process.
# {listen-addr}     bind address or '*' followed by tcp or tls port listening on, or
#                   unix socket if only that's available.
# {server-mode}     special mode, i.e. "[sentinel]" or "[cluster]".
# {port}            tcp port listening on, or 0.
# {tls-port}        tls port listening on, or 0.
# {unixsocket}      unix domain socket listening on, or "".
# {config-file}     name of configuration file used.
#
proc-title-template "{title} {listen-addr} {server-mode}"

################################ snapshotting  ################################

# save the db to disk.
#
# save <seconds> <changes> [<seconds> <changes> ...]
#
# redis will save the db if the given number of seconds elapsed and it
# surpassed the given number of write operations against the db.
#
# snapshotting can be completely disabled with a single empty string argument
# as in following example:
#
# save ""
#
# unless specified otherwise, by default redis will save the db:
#   * after 3600 seconds (an hour) if at least 1 change was performed
#   * after 300 seconds (5 minutes) if at least 100 changes were performed
#   * after 60 seconds if at least 10000 changes were performed
#
# you can set these explicitly by uncommenting the following line.
#
# save 3600 1 300 100 60 10000

# by default redis will stop accepting writes if rdb snapshots are enabled
# (at least one save point) and the latest background save failed.
# this will make the user aware (in a hard way) that data is not persisting
# on disk properly, otherwise chances are that no one will notice and some
# disaster will happen.
#
# if the background saving process will start working again redis will
# automatically allow writes again.
#
# however if you have setup your proper monitoring of the redis server
# and persistence, you may want to disable this feature so that redis will
# continue to work as usual even if there are problems with disk,
# permissions, and so forth.
stop-writes-on-bgsave-error yes

# compress string objects using lzf when dump .rdb databases?
# by default compression is enabled as it's almost always a win.
# if you want to save some cpu in the saving child set it to 'no' but
# the dataset will likely be bigger if you have compressible values or keys.
rdbcompression yes

# since version 5 of rdb a crc64 checksum is placed at the end of the file.
# this makes the format more resistant to corruption but there is a performance
# hit to pay (around 10%) when saving and loading rdb files, so you can disable it
# for maximum performances.
#
# rdb files created with checksum disabled have a checksum of zero that will
# tell the loading code to skip the check.
rdbchecksum yes

# enables or disables full sanitization checks for ziplist and listpack etc when
# loading an rdb or restore payload. this reduces the chances of a assertion or
# crash later on while processing commands.
# options:
#   no         - never perform full sanitization
#   yes        - always perform full sanitization
#   clients    - perform full sanitization only for user connections.
#                excludes: rdb files, restore commands received from the master
#                connection, and client connections which have the
#                skip-sanitize-payload acl flag.
# the default should be 'clients' but since it currently affects cluster
# resharding via migrate, it is temporarily set to 'no' by default.
#
# sanitize-dump-payload no

# the filename where to dump the db
dbfilename dump.rdb

# remove rdb files used by replication in instances without persistence
# enabled. by default this option is disabled, however there are environments
# where for regulations or other security concerns, rdb files persisted on
# disk by masters in order to feed replicas, or stored on disk by replicas
# in order to load them for the initial synchronization, should be deleted
# asap. note that this option only works in instances that have both aof
# and rdb persistence disabled, otherwise is completely ignored.
#
# an alternative (and sometimes better) way to obtain the same effect is
# to use diskless replication on both master and replicas instances. however
# in the case of replicas, diskless is not always an option.
rdb-del-sync-files no

# the working directory.
#
# the db will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
#
# the append only file will also be created inside this directory.
#
# note that you must specify a directory here, not a file name.
dir ./

################################# replication #################################

# master-replica replication. use replicaof to make a redis instance a copy of
# another redis server. a few things to understand asap about redis replication.
#
#   +------------------+      +---------------+
#   |      master      | ---> |    replica    |
#   | (receive writes) |      |  (exact copy) |
#   +------------------+      +---------------+
#
# 1) redis replication is asynchronous, but you can configure a master to
#    stop accepting writes if it appears to be not connected with at least
#    a given number of replicas.
# 2) redis replicas are able to perform a partial resynchronization with the
#    master if the replication link is lost for a relatively small amount of
#    time. you may want to configure the replication backlog size (see the next
#    sections of this file) with a sensible value depending on your needs.
# 3) replication is automatic and does not need user intervention. after a
#    network partition replicas automatically try to reconnect to masters
#    and resynchronize with them.
#
# replicaof <masterip> <masterport>

# if the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the replica to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the replica request.
#
# masterauth <master-password>
#
# however this is not enough if you are using redis acls (for redis version
# 6 or greater), and the default user is not capable of running the psync
# command and/or other commands needed for replication. in this case it's
# better to configure a special user to use with replication, and specify the
# masteruser configuration as such:
#
# masteruser <username>
#
# when masteruser is specified, the replica will authenticate against its
# master using the new auth form: auth <username> <password>.

# when a replica loses its connection with the master, or when the replication
# is still in progress, the replica can act in two different ways:
#
# 1) if replica-serve-stale-data is set to 'yes' (the default) the replica will
#    still reply to client requests, possibly with out of date data, or the
#    data set may just be empty if this is the first synchronization.
#
# 2) if replica-serve-stale-data is set to 'no' the replica will reply with error
#    "masterdown link with master is down and replica-serve-stale-data is set to 'no'"
#    to all data access commands, excluding commands such as:
#    info, replicaof, auth, shutdown, replconf, role, config, subscribe,
#    unsubscribe, psubscribe, punsubscribe, publish, pubsub, command, post,
#    host and latency.
#
replica-serve-stale-data yes

# you can configure a replica instance to accept writes or not. writing against
# a replica instance may be useful to store some ephemeral data (because data
# written on a replica will be easily deleted after resync with the master) but
# may also cause problems if clients are writing to it because of a
# misconfiguration.
#
# since redis 2.6 by default replicas are read-only.
#
# note: read only replicas are not designed to be exposed to untrusted clients
# on the internet. it's just a protection layer against misuse of the instance.
# still a read only replica exports by default all the administrative commands
# such as config, debug, and so forth. to a limited extent you can improve
# security of read only replicas using 'rename-command' to shadow all the
# administrative / dangerous commands.
replica-read-only yes

# replication sync strategy: disk or socket.
#
# new replicas and reconnecting replicas that are not able to continue the
# replication process just receiving differences, need to do what is called a
# "full synchronization". an rdb file is transmitted from the master to the
# replicas.
#
# the transmission can happen in two different ways:
#
# 1) disk-backed: the redis master creates a new process that writes the rdb
#                 file on disk. later the file is transferred by the parent
#                 process to the replicas incrementally.
# 2) diskless: the redis master creates a new process that directly writes the
#              rdb file to replica sockets, without touching the disk at all.
#
# with disk-backed replication, while the rdb file is generated, more replicas
# can be queued and served with the rdb file as soon as the current child
# producing the rdb file finishes its work. with diskless replication instead
# once the transfer starts, new replicas arriving will be queued and a new
# transfer will start when the current one terminates.
#
# when diskless replication is used, the master waits a configurable amount of
# time (in seconds) before starting the transfer in the hope that multiple
# replicas will arrive and the transfer can be parallelized.
#
# with slow disks and fast (large bandwidth) networks, diskless replication
# works better.
repl-diskless-sync yes

# when diskless replication is enabled, it is possible to configure the delay
# the server waits in order to spawn the child that transfers the rdb via socket
# to the replicas.
#
# this is important since once the transfer starts, it is not possible to serve
# new replicas arriving, that will be queued for the next rdb transfer, so the
# server waits a delay in order to let more replicas arrive.
#
# the delay is specified in seconds, and by default is 5 seconds. to disable
# it entirely just set it to 0 seconds and the transfer will start asap.
repl-diskless-sync-delay 5

# when diskless replication is enabled with a delay, it is possible to let
# the replication start before the maximum delay is reached if the maximum
# number of replicas expected have connected. default of 0 means that the
# maximum is not defined and redis will wait the full delay.
repl-diskless-sync-max-replicas 0

# -----------------------------------------------------------------------------
# warning: rdb diskless load is experimental. since in this setup the replica
# does not immediately store an rdb on disk, it may cause data loss during
# failovers. rdb diskless load + redis modules not handling i/o reads may also
# cause redis to abort in case of i/o errors during the initial synchronization
# stage with the master. use only if you know what you are doing.
# -----------------------------------------------------------------------------
#
# replica can load the rdb it reads from the replication link directly from the
# socket, or store the rdb to a file and read that file after it was completely
# received from the master.
#
# in many cases the disk is slower than the network, and storing and loading
# the rdb file may increase replication time (and even increase the master's
# copy on write memory and replica buffers).
# however, parsing the rdb file directly from the socket may mean that we have
# to flush the contents of the current database before the full rdb was
# received. for this reason we have the following options:
#
# "disabled"    - don't use diskless load (store the rdb file to the disk first)
# "on-empty-db" - use diskless load only when it is completely safe.
# "swapdb"      - keep current db contents in ram while parsing the data directly
#                 from the socket. replicas in this mode can keep serving current
#                 data set while replication is in progress, except for cases where
#                 they can't recognize master as having a data set from same
#                 replication history.
#                 note that this requires sufficient memory, if you don't have it,
#                 you risk an oom kill.
repl-diskless-load disabled

# master send pings to its replicas in a predefined interval. it's possible to
# change this interval with the repl_ping_replica_period option. the default
# value is 10 seconds.
#
# repl-ping-replica-period 10

# the following option sets the replication timeout for:
#
# 1) bulk transfer i/o during sync, from the point of view of replica.
# 2) master timeout from the point of view of replicas (data, pings).
# 3) replica timeout from the point of view of masters (replconf ack pings).
#
# it is important to make sure that this value is greater than the value
# specified for repl-ping-replica-period otherwise a timeout will be detected
# every time there is low traffic between the master and the replica. the default
# value is 60 seconds.
#
# repl-timeout 60

# disable tcp_nodelay on the replica socket after sync?
#
# if you select "yes" redis will use a smaller number of tcp packets and
# less bandwidth to send data to replicas. but this can add a delay for
# the data to appear on the replica side, up to 40 milliseconds with
# linux kernels using a default configuration.
#
# if you select "no" the delay for data to appear on the replica side will
# be reduced but more bandwidth will be used for replication.
#
# by default we optimize for low latency, but in very high traffic conditions
# or when the master and replicas are many hops away, turning this to "yes" may
# be a good idea.
repl-disable-tcp-nodelay no

# set the replication backlog size. the backlog is a buffer that accumulates
# replica data when replicas are disconnected for some time, so that when a
# replica wants to reconnect again, often a full resync is not needed, but a
# partial resync is enough, just passing the portion of data the replica
# missed while disconnected.
#
# the bigger the replication backlog, the longer the replica can endure the
# disconnect and later be able to perform a partial resynchronization.
#
# the backlog is only allocated if there is at least one replica connected.
#
# repl-backlog-size 1mb

# after a master has no connected replicas for some time, the backlog will be
# freed. the following option configures the amount of seconds that need to
# elapse, starting from the time the last replica disconnected, for the backlog
# buffer to be freed.
#
# note that replicas never free the backlog for timeout, since they may be
# promoted to masters later, and should be able to correctly "partially
# resynchronize" with other replicas: hence they should always accumulate backlog.
#
# a value of 0 means to never release the backlog.
#
# repl-backlog-ttl 3600

# the replica priority is an integer number published by redis in the info
# output. it is used by redis sentinel in order to select a replica to promote
# into a master if the master is no longer working correctly.
#
# a replica with a low priority number is considered better for promotion, so
# for instance if there are three replicas with priority 10, 100, 25 sentinel
# will pick the one with priority 10, that is the lowest.
#
# however a special priority of 0 marks the replica as not able to perform the
# role of master, so a replica with priority of 0 will never be selected by
# redis sentinel for promotion.
#
# by default the priority is 100.
replica-priority 100

# the propagation error behavior controls how redis will behave when it is
# unable to handle a command being processed in the replication stream from a master
# or processed while reading from an aof file. errors that occur during propagation
# are unexpected, and can cause data inconsistency. however, there are edge cases
# in earlier versions of redis where it was possible for the server to replicate or persist
# commands that would fail on future versions. for this reason the default behavior
# is to ignore such errors and continue processing commands.
#
# if an application wants to ensure there is no data divergence, this configuration
# should be set to 'panic' instead. the value can also be set to 'panic-on-replicas'
# to only panic when a replica encounters an error on the replication stream. one of
# these two panic values will become the default value in the future once there are
# sufficient safety mechanisms in place to prevent false positive crashes.
#
# propagation-error-behavior ignore

# replica ignore disk write errors controls the behavior of a replica when it is
# unable to persist a write command received from its master to disk. by default,
# this configuration is set to 'no' and will crash the replica in this condition.
# it is not recommended to change this default, however in order to be compatible
# with older versions of redis this config can be toggled to 'yes' which will just
# log a warning and execute the write command it got from the master.
#
# replica-ignore-disk-write-errors no

# -----------------------------------------------------------------------------
# by default, redis sentinel includes all replicas in its reports. a replica
# can be excluded from redis sentinel's announcements. an unannounced replica
# will be ignored by the 'sentinel replicas <master>' command and won't be
# exposed to redis sentinel's clients.
#
# this option does not change the behavior of replica-priority. even with
# replica-announced set to 'no', the replica can be promoted to master. to
# prevent this behavior, set replica-priority to 0.
#
# replica-announced yes

# it is possible for a master to stop accepting writes if there are less than
# n replicas connected, having a lag less or equal than m seconds.
#
# the n replicas need to be in "online" state.
#
# the lag in seconds, that must be <= the specified value, is calculated from
# the last ping received from the replica, that is usually sent every second.
#
# this option does not guarantee that n replicas will accept the write, but
# will limit the window of exposure for lost writes in case not enough replicas
# are available, to the specified number of seconds.
#
# for example to require at least 3 replicas with a lag <= 10 seconds use:
#
# min-replicas-to-write 3
# min-replicas-max-lag 10
#
# setting one or the other to 0 disables the feature.
#
# by default min-replicas-to-write is set to 0 (feature disabled) and
# min-replicas-max-lag is set to 10.

# a redis master is able to list the address and port of the attached
# replicas in different ways. for example the "info replication" section
# offers this information, which is used, among other tools, by
# redis sentinel in order to discover replica instances.
# another place where this info is available is in the output of the
# "role" command of a master.
#
# the listed ip address and port normally reported by a replica is
# obtained in the following way:
#
#   ip: the address is auto detected by checking the peer address
#   of the socket used by the replica to connect with the master.
#
#   port: the port is communicated by the replica during the replication
#   handshake, and is normally the port that the replica is using to
#   listen for connections.
#
# however when port forwarding or network address translation (nat) is
# used, the replica may actually be reachable via different ip and port
# pairs. the following two options can be used by a replica in order to
# report to its master a specific set of ip and port, so that both info
# and role will report those values.
#
# there is no need to use both the options if you need to override just
# the port or the ip address.
#
# replica-announce-ip 5.5.5.5
# replica-announce-port 1234

############################### keys tracking #################################

# redis implements server assisted support for client side caching of values.
# this is implemented using an invalidation table that remembers, using
# a radix key indexed by key name, what clients have which keys. in turn
# this is used in order to send invalidation messages to clients. please
# check this page to understand more about the feature:
#
#   https://redis.io/topics/client-side-caching
#
# when tracking is enabled for a client, all the read only queries are assumed
# to be cached: this will force redis to store information in the invalidation
# table. when keys are modified, such information is flushed away, and
# invalidation messages are sent to the clients. however if the workload is
# heavily dominated by reads, redis could use more and more memory in order
# to track the keys fetched by many clients.
#
# for this reason it is possible to configure a maximum fill value for the
# invalidation table. by default it is set to 1m of keys, and once this limit
# is reached, redis will start to evict keys in the invalidation table
# even if they were not modified, just to reclaim memory: this will in turn
# force the clients to invalidate the cached values. basically the table
# maximum size is a trade off between the memory you want to spend server
# side to track information about who cached what, and the ability of clients
# to retain cached objects in memory.
#
# if you set the value to 0, it means there are no limits, and redis will
# retain as many keys as needed in the invalidation table.
# in the "stats" info section, you can find information about the number of
# keys in the invalidation table at every given moment.
#
# note: when key tracking is used in broadcasting mode, no memory is used
# in the server side so this setting is useless.
#
# tracking-table-max-keys 1000000

################################## security ###################################

# warning: since redis is pretty fast, an outside user can try up to
# 1 million passwords per second against a modern box. this means that you
# should use very strong passwords, otherwise they will be very easy to break.
# note that because the password is really a shared secret between the client
# and the server, and should not be memorized by any human, the password
# can be easily a long string from /dev/urandom or whatever, so by using a
# long and unguessable password no brute force attack will be possible.

# redis acl users are defined in the following format:
#
#   user <username> ... acl rules ...
#
# for example:
#
#   user worker +@list +@connection ~jobs:* on >ffa9203c493aa99
#
# the special username "default" is used for new connections. if this user
# has the "nopass" rule, then new connections will be immediately authenticated
# as the "default" user without the need of any password provided via the
# auth command. otherwise if the "default" user is not flagged with "nopass"
# the connections will start in not authenticated state, and will require
# auth (or the hello command auth option) in order to be authenticated and
# start to work.
#
# the acl rules that describe what a user can do are the following:
#
#  on           enable the user: it is possible to authenticate as this user.
#  off          disable the user: it's no longer possible to authenticate
#               with this user, however the already authenticated connections
#               will still work.
#  skip-sanitize-payload    restore dump-payload sanitization is skipped.
#  sanitize-payload         restore dump-payload is sanitized (default).
#  +<command>   allow the execution of that command.
#               may be used with `|` for allowing subcommands (e.g "+config|get")
#  -<command>   disallow the execution of that command.
#               may be used with `|` for blocking subcommands (e.g "-config|set")
#  +@<category> allow the execution of all the commands in such category
#               with valid categories are like @admin, @set, @sortedset, ...
#               and so forth, see the full list in the server.c file where
#               the redis command table is described and defined.
#               the special category @all means all the commands, but currently
#               present in the server, and that will be loaded in the future
#               via modules.
#  +<command>|first-arg  allow a specific first argument of an otherwise
#                        disabled command. it is only supported on commands with
#                        no sub-commands, and is not allowed as negative form
#                        like -select|1, only additive starting with "+". this
#                        feature is deprecated and may be removed in the future.
#  allcommands  alias for +@all. note that it implies the ability to execute
#               all the future commands loaded via the modules system.
#  nocommands   alias for -@all.
#  ~<pattern>   add a pattern of keys that can be mentioned as part of
#               commands. for instance ~* allows all the keys. the pattern
#               is a glob-style pattern like the one of keys.
#               it is possible to specify multiple patterns.
# %r~<pattern>  add key read pattern that specifies which keys can be read 
#               from.
# %w~<pattern>  add key write pattern that specifies which keys can be
#               written to. 
#  allkeys      alias for ~*
#  resetkeys    flush the list of allowed keys patterns.
#  &<pattern>   add a glob-style pattern of pub/sub channels that can be
#               accessed by the user. it is possible to specify multiple channel
#               patterns.
#  allchannels  alias for &*
#  resetchannels            flush the list of allowed channel patterns.
#  ><password>  add this password to the list of valid password for the user.
#               for example >mypass will add "mypass" to the list.
#               this directive clears the "nopass" flag (see later).
#  <<password>  remove this password from the list of valid passwords.
#  nopass       all the set passwords of the user are removed, and the user
#               is flagged as requiring no password: it means that every
#               password will work against this user. if this directive is
#               used for the default user, every new connection will be
#               immediately authenticated with the default user without
#               any explicit auth command required. note that the "resetpass"
#               directive will clear this condition.
#  resetpass    flush the list of allowed passwords. moreover removes the
#               "nopass" status. after "resetpass" the user has no associated
#               passwords and there is no way to authenticate without adding
#               some password (or setting it as "nopass" later).
#  reset        performs the following actions: resetpass, resetkeys, off,
#               -@all. the user returns to the same state it has immediately
#               after its creation.
# (<options>)   create a new selector with the options specified within the
#               parentheses and attach it to the user. each option should be 
#               space separated. the first character must be ( and the last 
#               character must be ).
# clearselectors            remove all of the currently attached selectors. 
#                           note this does not change the "root" user permissions,
#                           which are the permissions directly applied onto the
#                           user (outside the parentheses).
#
# acl rules can be specified in any order: for instance you can start with
# passwords, then flags, or key patterns. however note that the additive
# and subtractive rules will change meaning depending on the ordering.
# for instance see the following example:
#
#   user alice on +@all -debug ~* >somepassword
#
# this will allow "alice" to use all the commands with the exception of the
# debug command, since +@all added all the commands to the set of the commands
# alice can use, and later debug was removed. however if we invert the order
# of two acl rules the result will be different:
#
#   user alice on -debug +@all ~* >somepassword
#
# now debug was removed when alice had yet no commands in the set of allowed
# commands, later all the commands are added, so the user will be able to
# execute everything.
#
# basically acl rules are processed left-to-right.
#
# the following is a list of command categories and their meanings:
# * keyspace - writing or reading from keys, databases, or their metadata 
#     in a type agnostic way. includes del, restore, dump, rename, exists, dbsize,
#     keys, expire, ttl, flushall, etc. commands that may modify the keyspace,
#     key or metadata will also have `write` category. commands that only read
#     the keyspace, key or metadata will have the `read` category.
# * read - reading from keys (values or metadata). note that commands that don't
#     interact with keys, will not have either `read` or `write`.
# * write - writing to keys (values or metadata)
# * admin - administrative commands. normal applications will never need to use
#     these. includes replicaof, config, debug, save, monitor, acl, shutdown, etc.
# * dangerous - potentially dangerous (each should be considered with care for
#     various reasons). this includes flushall, migrate, restore, sort, keys,
#     client, debug, info, config, save, replicaof, etc.
# * connection - commands affecting the connection or other connections.
#     this includes auth, select, command, client, echo, ping, etc.
# * blocking - potentially blocking the connection until released by another
#     command.
# * fast - fast o(1) commands. may loop on the number of arguments, but not the
#     number of elements in the key.
# * slow - all commands that are not fast.
# * pubsub - publish / subscribe related
# * transaction - watch / multi / exec related commands.
# * scripting - scripting related.
# * set - data type: sets related.
# * sortedset - data type: zsets related.
# * list - data type: lists related.
# * hash - data type: hashes related.
# * string - data type: strings related.
# * bitmap - data type: bitmaps related.
# * hyperloglog - data type: hyperloglog related.
# * geo - data type: geo related.
# * stream - data type: streams related.
#
# for more information about acl configuration please refer to
# the redis web site at https://redis.io/topics/acl

# acl log
#
# the acl log tracks failed commands and authentication events associated
# with acls. the acl log is useful to troubleshoot failed commands blocked
# by acls. the acl log is stored in memory. you can reclaim memory with
# acl log reset. define the maximum entry length of the acl log below.
acllog-max-len 128

# using an external acl file
#
# instead of configuring users here in this file, it is possible to use
# a stand-alone file just listing users. the two methods cannot be mixed:
# if you configure users here and at the same time you activate the external
# acl file, the server will refuse to start.
#
# the format of the external acl user file is exactly the same as the
# format that is used inside redis.conf to describe users.
#
# aclfile /etc/redis/users.acl

# important note: starting with redis 6 "requirepass" is just a compatibility
# layer on top of the new acl system. the option effect will be just setting
# the password for the default user. clients will still authenticate using
# auth <password> as usually, or more explicitly with auth default <password>
# if they follow the new protocol: both will work.
#
# the requirepass is not compatible with aclfile option and the acl load
# command, these will cause requirepass to be ignored.
#
# requirepass foobared

# new users are initialized with restrictive permissions by default, via the
# equivalent of this acl rule 'off resetkeys -@all'. starting with redis 6.2, it
# is possible to manage access to pub/sub channels with acl rules as well. the
# default pub/sub channels permission if new users is controlled by the
# acl-pubsub-default configuration directive, which accepts one of these values:
#
# allchannels: grants access to all pub/sub channels
# resetchannels: revokes access to all pub/sub channels
#
# from redis 7.0, acl-pubsub-default defaults to 'resetchannels' permission.
#
# acl-pubsub-default resetchannels

# command renaming (deprecated).
#
# ------------------------------------------------------------------------
# warning: avoid using this option if possible. instead use acls to remove
# commands from the default user, and put them only in some admin user you
# create for administrative purposes.
# ------------------------------------------------------------------------
#
# it is possible to change the name of dangerous commands in a shared
# environment. for instance the config command may be renamed into something
# hard to guess so that it will still be available for internal-use tools
# but not available for general clients.
#
# example:
#
# rename-command config b840fc02d524045429941cc15f59e41cb7be6c52
#
# it is also possible to completely kill a command by renaming it into
# an empty string:
#
# rename-command config ""
#
# please note that changing the name of commands that are logged into the
# aof file or transmitted to replicas may cause problems.

################################### clients ####################################

# set the max number of connected clients at the same time. by default
# this limit is set to 10000 clients, however if the redis server is not
# able to configure the process file limit to allow for the specified limit
# the max number of allowed clients is set to the current file limit
# minus 32 (as redis reserves a few file descriptors for internal uses).
#
# once the limit is reached redis will close all the new connections sending
# an error 'max number of clients reached'.
#
# important: when redis cluster is used, the max number of connections is also
# shared with the cluster bus: every node in the cluster will use two
# connections, one incoming and another outgoing. it is important to size the
# limit accordingly in case of very large clusters.
#
# maxclients 10000

############################## memory management ################################

# set a memory usage limit to the specified amount of bytes.
# when the memory limit is reached redis will try to remove keys
# according to the eviction policy selected (see maxmemory-policy).
#
# if redis can't remove keys according to the policy, or if the policy is
# set to 'noeviction', redis will start to reply with errors to commands
# that would use more memory, like set, lpush, and so on, and will continue
# to reply to read-only commands like get.
#
# this option is usually useful when using redis as an lru or lfu cache, or to
# set a hard memory limit for an instance (using the 'noeviction' policy).
#
# warning: if you have replicas attached to an instance with maxmemory on,
# the size of the output buffers needed to feed the replicas are subtracted
# from the used memory count, so that network problems / resyncs will
# not trigger a loop where keys are evicted, and in turn the output
# buffer of replicas is full with dels of keys evicted triggering the deletion
# of more keys, and so forth until the database is completely emptied.
#
# in short... if you have replicas attached it is suggested that you set a lower
# limit for maxmemory so that there is some free ram on the system for replica
# output buffers (but this is not needed if the policy is 'noeviction').
#
# maxmemory <bytes>

# maxmemory policy: how redis will select what to remove when maxmemory
# is reached. you can select one from the following behaviors:
#
# volatile-lru -> evict using approximated lru, only keys with an expire set.
# allkeys-lru -> evict any key using approximated lru.
# volatile-lfu -> evict using approximated lfu, only keys with an expire set.
# allkeys-lfu -> evict any key using approximated lfu.
# volatile-random -> remove a random key having an expire set.
# allkeys-random -> remove a random key, any key.
# volatile-ttl -> remove the key with the nearest expire time (minor ttl)
# noeviction -> don't evict anything, just return an error on write operations.
#
# lru means least recently used
# lfu means least frequently used
#
# both lru, lfu and volatile-ttl are implemented using approximated
# randomized algorithms.
#
# note: with any of the above policies, when there are no suitable keys for
# eviction, redis will return an error on write operations that require
# more memory. these are usually commands that create new keys, add data or
# modify existing keys. a few examples are: set, incr, hset, lpush, sunionstore,
# sort (due to the store argument), and exec (if the transaction includes any
# command that requires memory).
#
# the default is:
#
# maxmemory-policy noeviction

# lru, lfu and minimal ttl algorithms are not precise algorithms but approximated
# algorithms (in order to save memory), so you can tune it for speed or
# accuracy. by default redis will check five keys and pick the one that was
# used least recently, you can change the sample size using the following
# configuration directive.
#
# the default of 5 produces good enough results. 10 approximates very closely
# true lru but costs more cpu. 3 is faster but not very accurate.
#
# maxmemory-samples 5

# eviction processing is designed to function well with the default setting.
# if there is an unusually large amount of write traffic, this value may need to
# be increased.  decreasing this value may reduce latency at the risk of
# eviction processing effectiveness
#   0 = minimum latency, 10 = default, 100 = process without regard to latency
#
# maxmemory-eviction-tenacity 10

# starting from redis 5, by default a replica will ignore its maxmemory setting
# (unless it is promoted to master after a failover or manually). it means
# that the eviction of keys will be just handled by the master, sending the
# del commands to the replica as keys evict in the master side.
#
# this behavior ensures that masters and replicas stay consistent, and is usually
# what you want, however if your replica is writable, or you want the replica
# to have a different memory setting, and you are sure all the writes performed
# to the replica are idempotent, then you may change this default (but be sure
# to understand what you are doing).
#
# note that since the replica by default does not evict, it may end using more
# memory than the one set via maxmemory (there are certain buffers that may
# be larger on the replica, or data structures may sometimes take more memory
# and so forth). so make sure you monitor your replicas and make sure they
# have enough memory to never hit a real out-of-memory condition before the
# master hits the configured maxmemory setting.
#
# replica-ignore-maxmemory yes

# redis reclaims expired keys in two ways: upon access when those keys are
# found to be expired, and also in background, in what is called the
# "active expire key". the key space is slowly and interactively scanned
# looking for expired keys to reclaim, so that it is possible to free memory
# of keys that are expired and will never be accessed again in a short time.
#
# the default effort of the expire cycle will try to avoid having more than
# ten percent of expired keys still in memory, and will try to avoid consuming
# more than 25% of total memory and to add latency to the system. however
# it is possible to increase the expire "effort" that is normally set to
# "1", to a greater value, up to the value "10". at its maximum value the
# system will use more cpu, longer cycles (and technically may introduce
# more latency), and will tolerate less already expired keys still present
# in the system. it's a tradeoff between memory, cpu and latency.
#
# active-expire-effort 1

############################# lazy freeing ####################################

# redis has two primitives to delete keys. one is called del and is a blocking
# deletion of the object. it means that the server stops processing new commands
# in order to reclaim all the memory associated with an object in a synchronous
# way. if the key deleted is associated with a small object, the time needed
# in order to execute the del command is very small and comparable to most other
# o(1) or o(log_n) commands in redis. however if the key is associated with an
# aggregated value containing millions of elements, the server can block for
# a long time (even seconds) in order to complete the operation.
#
# for the above reasons redis also offers non blocking deletion primitives
# such as unlink (non blocking del) and the async option of flushall and
# flushdb commands, in order to reclaim memory in background. those commands
# are executed in constant time. another thread will incrementally free the
# object in the background as fast as possible.
#
# del, unlink and async option of flushall and flushdb are user-controlled.
# it's up to the design of the application to understand when it is a good
# idea to use one or the other. however the redis server sometimes has to
# delete keys or flush the whole database as a side effect of other operations.
# specifically redis deletes objects independently of a user call in the
# following scenarios:
#
# 1) on eviction, because of the maxmemory and maxmemory policy configurations,
#    in order to make room for new data, without going over the specified
#    memory limit.
# 2) because of expire: when a key with an associated time to live (see the
#    expire command) must be deleted from memory.
# 3) because of a side effect of a command that stores data on a key that may
#    already exist. for example the rename command may delete the old key
#    content when it is replaced with another one. similarly sunionstore
#    or sort with store option may delete existing keys. the set command
#    itself removes any old content of the specified key in order to replace
#    it with the specified string.
# 4) during replication, when a replica performs a full resynchronization with
#    its master, the content of the whole database is removed in order to
#    load the rdb file just transferred.
#
# in all the above cases the default is to delete objects in a blocking way,
# like if del was called. however you can configure each case specifically
# in order to instead release memory in a non-blocking way like if unlink
# was called, using the following configuration directives.

lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush no

# it is also possible, for the case when to replace the user code del calls
# with unlink calls is not easy, to modify the default behavior of the del
# command to act exactly like unlink, using the following configuration
# directive:

lazyfree-lazy-user-del no

# flushdb, flushall, script flush and function flush support both asynchronous and synchronous
# deletion, which can be controlled by passing the [sync|async] flags into the
# commands. when neither flag is passed, this directive will be used to determine
# if the data should be deleted asynchronously.

lazyfree-lazy-user-flush no

################################ threaded i/o #################################

# redis is mostly single threaded, however there are certain threaded
# operations such as unlink, slow i/o accesses and other things that are
# performed on side threads.
#
# now it is also possible to handle redis clients socket reads and writes
# in different i/o threads. since especially writing is so slow, normally
# redis users use pipelining in order to speed up the redis performances per
# core, and spawn multiple instances in order to scale more. using i/o
# threads it is possible to easily speedup two times redis without resorting
# to pipelining nor sharding of the instance.
#
# by default threading is disabled, we suggest enabling it only in machines
# that have at least 4 or more cores, leaving at least one spare core.
# using more than 8 threads is unlikely to help much. we also recommend using
# threaded i/o only if you actually have performance problems, with redis
# instances being able to use a quite big percentage of cpu time, otherwise
# there is no point in using this feature.
#
# so for instance if you have a four cores boxes, try to use 2 or 3 i/o
# threads, if you have a 8 cores, try to use 6 threads. in order to
# enable i/o threads use the following configuration directive:
#
# io-threads 4
#
# setting io-threads to 1 will just use the main thread as usual.
# when i/o threads are enabled, we only use threads for writes, that is
# to thread the write(2) syscall and transfer the client buffers to the
# socket. however it is also possible to enable threading of reads and
# protocol parsing using the following configuration directive, by setting
# it to yes:
#
# io-threads-do-reads no
#
# usually threading reads doesn't help much.
#
# note 1: this configuration directive cannot be changed at runtime via
# config set. also, this feature currently does not work when ssl is
# enabled.
#
# note 2: if you want to test the redis speedup using redis-benchmark, make
# sure you also run the benchmark itself in threaded mode, using the
# --threads option to match the number of redis threads, otherwise you'll not
# be able to notice the improvements.

############################ kernel oom control ##############################

# on linux, it is possible to hint the kernel oom killer on what processes
# should be killed first when out of memory.
#
# enabling this feature makes redis actively control the oom_score_adj value
# for all its processes, depending on their role. the default scores will
# attempt to have background child processes killed before all others, and
# replicas killed before masters.
#
# redis supports these options:
#
# no:       don't make changes to oom-score-adj (default).
# yes:      alias to "relative" see below.
# absolute: values in oom-score-adj-values are written as is to the kernel.
# relative: values are used relative to the initial value of oom_score_adj when
#           the server starts and are then clamped to a range of -1000 to 1000.
#           because typically the initial value is 0, they will often match the
#           absolute values.
oom-score-adj no

# when oom-score-adj is used, this directive controls the specific values used
# for master, replica and background child processes. values range -2000 to
# 2000 (higher means more likely to be killed).
#
# unprivileged processes (not root, and without cap_sys_resource capabilities)
# can freely increase their value, but not decrease it below its initial
# settings. this means that setting oom-score-adj to "relative" and setting the
# oom-score-adj-values to positive values will always succeed.
oom-score-adj-values 0 200 800


#################### kernel transparent hugepage control ######################

# usually the kernel transparent huge pages control is set to "madvise" or
# or "never" by default (/sys/kernel/mm/transparent_hugepage/enabled), in which
# case this config has no effect. on systems in which it is set to "always",
# redis will attempt to disable it specifically for the redis process in order
# to avoid latency problems specifically with fork(2) and cow.
# if for some reason you prefer to keep it enabled, you can set this config to
# "no" and the kernel global to "always".

disable-thp yes

############################## append only mode ###############################

# by default redis asynchronously dumps the dataset on disk. this mode is
# good enough in many applications, but an issue with the redis process or
# a power outage may result into a few minutes of writes lost (depending on
# the configured save points).
#
# the append only file is an alternative persistence mode that provides
# much better durability. for instance using the default data fsync policy
# (see later in the config file) redis can lose just one second of writes in a
# dramatic event like a server power outage, or a single write if something
# wrong with the redis process itself happens, but the operating system is
# still running correctly.
#
# aof and rdb persistence can be enabled at the same time without problems.
# if the aof is enabled on startup redis will load the aof, that is the file
# with the better durability guarantees.
#
# please check https://redis.io/topics/persistence for more information.

appendonly no

# the base name of the append only file.
#
# redis 7 and newer use a set of append-only files to persist the dataset
# and changes applied to it. there are two basic types of files in use:
#
# - base files, which are a snapshot representing the complete state of the
#   dataset at the time the file was created. base files can be either in
#   the form of rdb (binary serialized) or aof (textual commands).
# - incremental files, which contain additional commands that were applied
#   to the dataset following the previous file.
#
# in addition, manifest files are used to track the files and the order in
# which they were created and should be applied.
#
# append-only file names are created by redis following a specific pattern.
# the file name's prefix is based on the 'appendfilename' configuration
# parameter, followed by additional information about the sequence and type.
#
# for example, if appendfilename is set to appendonly.aof, the following file
# names could be derived:
#
# - appendonly.aof.1.base.rdb as a base file.
# - appendonly.aof.1.incr.aof, appendonly.aof.2.incr.aof as incremental files.
# - appendonly.aof.manifest as a manifest file.

appendfilename "appendonly.aof"

# for convenience, redis stores all persistent append-only files in a dedicated
# directory. the name of the directory is determined by the appenddirname
# configuration parameter.

appenddirname "appendonlydir"

# the fsync() call tells the operating system to actually write data on disk
# instead of waiting for more data in the output buffer. some os will really flush
# data on disk, some other os will just try to do it asap.
#
# redis supports three different modes:
#
# no: don't fsync, just let the os flush the data when it wants. faster.
# always: fsync after every write to the append only log. slow, safest.
# everysec: fsync only one time every second. compromise.
#
# the default is "everysec", as that's usually the right compromise between
# speed and data safety. it's up to you to understand if you can relax this to
# "no" that will let the operating system flush the output buffer when
# it wants, for better performances (but if you can live with the idea of
# some data loss consider the default persistence mode that's snapshotting),
# or on the contrary, use "always" that's very slow but a bit safer than
# everysec.
#
# more details please check the following article:
# http://antirez.com/post/redis-persistence-demystified.html
#
# if unsure, use "everysec".

# appendfsync always
appendfsync everysec
# appendfsync no

# when the aof fsync policy is set to always or everysec, and a background
# saving process (a background save or aof log background rewriting) is
# performing a lot of i/o against the disk, in some linux configurations
# redis may block too long on the fsync() call. note that there is no fix for
# this currently, as even performing fsync in a different thread will block
# our synchronous write(2) call.
#
# in order to mitigate this problem it's possible to use the following option
# that will prevent fsync() from being called in the main process while a
# bgsave or bgrewriteaof is in progress.
#
# this means that while another child is saving, the durability of redis is
# the same as "appendfsync no". in practical terms, this means that it is
# possible to lose up to 30 seconds of log in the worst scenario (with the
# default linux settings).
#
# if you have latency problems turn this to "yes". otherwise leave it as
# "no" that is the safest pick from the point of view of durability.

no-appendfsync-on-rewrite no

# automatic rewrite of the append only file.
# redis is able to automatically rewrite the log file implicitly calling
# bgrewriteaof when the aof log size grows by the specified percentage.
#
# this is how it works: redis remembers the size of the aof file after the
# latest rewrite (if no rewrite has happened since the restart, the size of
# the aof at startup is used).
#
# this base size is compared to the current size. if the current size is
# bigger than the specified percentage, the rewrite is triggered. also
# you need to specify a minimal size for the aof file to be rewritten, this
# is useful to avoid rewriting the aof file even if the percentage increase
# is reached but it is still pretty small.
#
# specify a percentage of zero in order to disable the automatic aof
# rewrite feature.

auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb

# an aof file may be found to be truncated at the end during the redis
# startup process, when the aof data gets loaded back into memory.
# this may happen when the system where redis is running
# crashes, especially when an ext4 filesystem is mounted without the
# data=ordered option (however this can't happen when redis itself
# crashes or aborts but the operating system still works correctly).
#
# redis can either exit with an error when this happens, or load as much
# data as possible (the default now) and start if the aof file is found
# to be truncated at the end. the following option controls this behavior.
#
# if aof-load-truncated is set to yes, a truncated aof file is loaded and
# the redis server starts emitting a log to inform the user of the event.
# otherwise if the option is set to no, the server aborts with an error
# and refuses to start. when the option is set to no, the user requires
# to fix the aof file using the "redis-check-aof" utility before to restart
# the server.
#
# note that if the aof file will be found to be corrupted in the middle
# the server will still exit with an error. this option only applies when
# redis will try to read more data from the aof file but not enough bytes
# will be found.
aof-load-truncated yes

# redis can create append-only base files in either rdb or aof formats. using
# the rdb format is always faster and more efficient, and disabling it is only
# supported for backward compatibility purposes.
aof-use-rdb-preamble yes

# redis supports recording timestamp annotations in the aof to support restoring
# the data from a specific point-in-time. however, using this capability changes
# the aof format in a way that may not be compatible with existing aof parsers.
aof-timestamp-enabled no

################################ shutdown #####################################

# maximum time to wait for replicas when shutting down, in seconds.
#
# during shut down, a grace period allows any lagging replicas to catch up with
# the latest replication offset before the master exists. this period can
# prevent data loss, especially for deployments without configured disk backups.
#
# the 'shutdown-timeout' value is the grace period's duration in seconds. it is
# only applicable when the instance has replicas. to disable the feature, set
# the value to 0.
#
# shutdown-timeout 10

# when redis receives a sigint or sigterm, shutdown is initiated and by default
# an rdb snapshot is written to disk in a blocking operation if save points are configured.
# the options used on signaled shutdown can include the following values:
# default:  saves rdb snapshot only if save points are configured.
#           waits for lagging replicas to catch up.
# save:     forces a db saving operation even if no save points are configured.
# nosave:   prevents db saving operation even if one or more save points are configured.
# now:      skips waiting for lagging replicas.
# force:    ignores any errors that would normally prevent the server from exiting.
#
# any combination of values is allowed as long as "save" and "nosave" are not set simultaneously.
# example: "nosave force now"
#
# shutdown-on-sigint default
# shutdown-on-sigterm default

################ non-deterministic long blocking commands #####################

# maximum time in milliseconds for eval scripts, functions and in some cases
# modules' commands before redis can start processing or rejecting other clients.
#
# if the maximum execution time is reached redis will start to reply to most
# commands with a busy error.
#
# in this state redis will only allow a handful of commands to be executed.
# for instance, script kill, function kill, shutdown nosave and possibly some
# module specific 'allow-busy' commands.
#
# script kill and function kill will only be able to stop a script that did not
# yet call any write commands, so shutdown nosave may be the only way to stop
# the server in the case a write command was already issued by the script when
# the user doesn't want to wait for the natural termination of the script.
#
# the default is 5 seconds. it is possible to set it to 0 or a negative value
# to disable this mechanism (uninterrupted execution). note that in the past
# this config had a different name, which is now an alias, so both of these do
# the same:
# lua-time-limit 5000
# busy-reply-threshold 5000

################################ redis cluster  ###############################

# normal redis instances can't be part of a redis cluster; only nodes that are
# started as cluster nodes can. in order to start a redis instance as a
# cluster node enable the cluster support uncommenting the following:
#
# cluster-enabled yes

# every cluster node has a cluster configuration file. this file is not
# intended to be edited by hand. it is created and updated by redis nodes.
# every redis cluster node requires a different cluster configuration file.
# make sure that instances running in the same system do not have
# overlapping cluster configuration file names.
#
# cluster-config-file nodes-6379.conf

# cluster node timeout is the amount of milliseconds a node must be unreachable
# for it to be considered in failure state.
# most other internal time limits are a multiple of the node timeout.
#
# cluster-node-timeout 15000

# the cluster port is the port that the cluster bus will listen for inbound connections on. when set 
# to the default value, 0, it will be bound to the command port + 10000. setting this value requires 
# you to specify the cluster bus port when executing cluster meet.
# cluster-port 0

# a replica of a failing master will avoid to start a failover if its data
# looks too old.
#
# there is no simple way for a replica to actually have an exact measure of
# its "data age", so the following two checks are performed:
#
# 1) if there are multiple replicas able to failover, they exchange messages
#    in order to try to give an advantage to the replica with the best
#    replication offset (more data from the master processed).
#    replicas will try to get their rank by offset, and apply to the start
#    of the failover a delay proportional to their rank.
#
# 2) every single replica computes the time of the last interaction with
#    its master. this can be the last ping or command received (if the master
#    is still in the "connected" state), or the time that elapsed since the
#    disconnection with the master (if the replication link is currently down).
#    if the last interaction is too old, the replica will not try to failover
#    at all.
#
# the point "2" can be tuned by user. specifically a replica will not perform
# the failover if, since the last interaction with the master, the time
# elapsed is greater than:
#
#   (node-timeout * cluster-replica-validity-factor) + repl-ping-replica-period
#
# so for example if node-timeout is 30 seconds, and the cluster-replica-validity-factor
# is 10, and assuming a default repl-ping-replica-period of 10 seconds, the
# replica will not try to failover if it was not able to talk with the master
# for longer than 310 seconds.
#
# a large cluster-replica-validity-factor may allow replicas with too old data to failover
# a master, while a too small value may prevent the cluster from being able to
# elect a replica at all.
#
# for maximum availability, it is possible to set the cluster-replica-validity-factor
# to a value of 0, which means, that replicas will always try to failover the
# master regardless of the last time they interacted with the master.
# (however they'll always try to apply a delay proportional to their
# offset rank).
#
# zero is the only value able to guarantee that when all the partitions heal
# the cluster will always be able to continue.
#
# cluster-replica-validity-factor 10

# cluster replicas are able to migrate to orphaned masters, that are masters
# that are left without working replicas. this improves the cluster ability
# to resist to failures as otherwise an orphaned master can't be failed over
# in case of failure if it has no working replicas.
#
# replicas migrate to orphaned masters only if there are still at least a
# given number of other working replicas for their old master. this number
# is the "migration barrier". a migration barrier of 1 means that a replica
# will migrate only if there is at least 1 other working replica for its master
# and so forth. it usually reflects the number of replicas you want for every
# master in your cluster.
#
# default is 1 (replicas migrate only if their masters remain with at least
# one replica). to disable migration just set it to a very large value or
# set cluster-allow-replica-migration to 'no'.
# a value of 0 can be set but is useful only for debugging and dangerous
# in production.
#
# cluster-migration-barrier 1

# turning off this option allows to use less automatic cluster configuration.
# it both disables migration to orphaned masters and migration from masters
# that became empty.
#
# default is 'yes' (allow automatic migrations).
#
# cluster-allow-replica-migration yes

# by default redis cluster nodes stop accepting queries if they detect there
# is at least a hash slot uncovered (no available node is serving it).
# this way if the cluster is partially down (for example a range of hash slots
# are no longer covered) all the cluster becomes, eventually, unavailable.
# it automatically returns available as soon as all the slots are covered again.
#
# however sometimes you want the subset of the cluster which is working,
# to continue to accept queries for the part of the key space that is still
# covered. in order to do so, just set the cluster-require-full-coverage
# option to no.
#
# cluster-require-full-coverage yes

# this option, when set to yes, prevents replicas from trying to failover its
# master during master failures. however the replica can still perform a
# manual failover, if forced to do so.
#
# this is useful in different scenarios, especially in the case of multiple
# data center operations, where we want one side to never be promoted if not
# in the case of a total dc failure.
#
# cluster-replica-no-failover no

# this option, when set to yes, allows nodes to serve read traffic while the
# cluster is in a down state, as long as it believes it owns the slots.
#
# this is useful for two cases.  the first case is for when an application
# doesn't require consistency of data during node failures or network partitions.
# one example of this is a cache, where as long as the node has the data it
# should be able to serve it.
#
# the second use case is for configurations that don't meet the recommended
# three shards but want to enable cluster mode and scale later. a
# master outage in a 1 or 2 shard configuration causes a read/write outage to the
# entire cluster without this option set, with it set there is only a write outage.
# without a quorum of masters, slot ownership will not change automatically.
#
# cluster-allow-reads-when-down no

# this option, when set to yes, allows nodes to serve pubsub shard traffic while
# the cluster is in a down state, as long as it believes it owns the slots.
#
# this is useful if the application would like to use the pubsub feature even when
# the cluster global stable state is not ok. if the application wants to make sure only
# one shard is serving a given channel, this feature should be kept as yes.
#
# cluster-allow-pubsubshard-when-down yes

# cluster link send buffer limit is the limit on the memory usage of an individual
# cluster bus link's send buffer in bytes. cluster links would be freed if they exceed
# this limit. this is to primarily prevent send buffers from growing unbounded on links
# toward slow peers (e.g. pubsub messages being piled up).
# this limit is disabled by default. enable this limit when 'mem_cluster_links' info field
# and/or 'send-buffer-allocated' entries in the 'cluster links` command output continuously increase.
# minimum limit of 1gb is recommended so that cluster link buffer can fit in at least a single
# pubsub message by default. (client-query-buffer-limit default value is 1gb)
#
# cluster-link-sendbuf-limit 0
 
# clusters can configure their announced hostname using this config. this is a common use case for 
# applications that need to use tls server name indication (sni) or dealing with dns based
# routing. by default this value is only shown as additional metadata in the cluster slots
# command, but can be changed using 'cluster-preferred-endpoint-type' config. this value is 
# communicated along the clusterbus to all nodes, setting it to an empty string will remove 
# the hostname and also propagate the removal.
#
# cluster-announce-hostname ""

# clusters can advertise how clients should connect to them using either their ip address,
# a user defined hostname, or by declaring they have no endpoint. which endpoint is
# shown as the preferred endpoint is set by using the cluster-preferred-endpoint-type
# config with values 'ip', 'hostname', or 'unknown-endpoint'. this value controls how
# the endpoint returned for moved/asking requests as well as the first field of cluster slots. 
# if the preferred endpoint type is set to hostname, but no announced hostname is set, a '?' 
# will be returned instead.
#
# when a cluster advertises itself as having an unknown endpoint, it's indicating that
# the server doesn't know how clients can reach the cluster. this can happen in certain 
# networking situations where there are multiple possible routes to the node, and the 
# server doesn't know which one the client took. in this case, the server is expecting
# the client to reach out on the same endpoint it used for making the last request, but use
# the port provided in the response.
#
# cluster-preferred-endpoint-type ip

# in order to setup your cluster make sure to read the documentation
# available at https://redis.io web site.

########################## cluster docker/nat support  ########################

# in certain deployments, redis cluster nodes address discovery fails, because
# addresses are nat-ted or because ports are forwarded (the typical case is
# docker and other containers).
#
# in order to make redis cluster working in such environments, a static
# configuration where each node knows its public address is needed. the
# following four options are used for this scope, and are:
#
# * cluster-announce-ip
# * cluster-announce-port
# * cluster-announce-tls-port
# * cluster-announce-bus-port
#
# each instructs the node about its address, client ports (for connections
# without and with tls) and cluster message bus port. the information is then
# published in the header of the bus packets so that other nodes will be able to
# correctly map the address of the node publishing the information.
#
# if cluster-tls is set to yes and cluster-announce-tls-port is omitted or set
# to zero, then cluster-announce-port refers to the tls port. note also that
# cluster-announce-tls-port has no effect if cluster-tls is set to no.
#
# if the above options are not used, the normal redis cluster auto-detection
# will be used instead.
#
# note that when remapped, the bus port may not be at the fixed offset of
# clients port + 10000, so you can specify any port and bus-port depending
# on how they get remapped. if the bus-port is not set, a fixed offset of
# 10000 will be used as usual.
#
# example:
#
# cluster-announce-ip 10.1.1.5
# cluster-announce-tls-port 6379
# cluster-announce-port 0
# cluster-announce-bus-port 6380

################################## slow log ###################################

# the redis slow log is a system to log queries that exceeded a specified
# execution time. the execution time does not include the i/o operations
# like talking with the client, sending the reply and so forth,
# but just the time needed to actually execute the command (this is the only
# stage of command execution where the thread is blocked and can not serve
# other requests in the meantime).
#
# you can configure the slow log with two parameters: one tells redis
# what is the execution time, in microseconds, to exceed in order for the
# command to get logged, and the other parameter is the length of the
# slow log. when a new command is logged the oldest one is removed from the
# queue of logged commands.

# the following time is expressed in microseconds, so 1000000 is equivalent
# to one second. note that a negative number disables the slow log, while
# a value of zero forces the logging of every command.
slowlog-log-slower-than 10000

# there is no limit to this length. just be aware that it will consume memory.
# you can reclaim memory used by the slow log with slowlog reset.
slowlog-max-len 128

################################ latency monitor ##############################

# the redis latency monitoring subsystem samples different operations
# at runtime in order to collect data related to possible sources of
# latency of a redis instance.
#
# via the latency command this information is available to the user that can
# print graphs and obtain reports.
#
# the system only logs operations that were performed in a time equal or
# greater than the amount of milliseconds specified via the
# latency-monitor-threshold configuration directive. when its value is set
# to zero, the latency monitor is turned off.
#
# by default latency monitoring is disabled since it is mostly not needed
# if you don't have latency issues, and collecting data has a performance
# impact, that while very small, can be measured under big load. latency
# monitoring can easily be enabled at runtime using the command
# "config set latency-monitor-threshold <milliseconds>" if needed.
latency-monitor-threshold 0

################################ latency tracking ##############################

# the redis extended latency monitoring tracks the per command latencies and enables
# exporting the percentile distribution via the info latencystats command,
# and cumulative latency distributions (histograms) via the latency command.
#
# by default, the extended latency monitoring is enabled since the overhead
# of keeping track of the command latency is very small.
# latency-tracking yes

# by default the exported latency percentiles via the info latencystats command
# are the p50, p99, and p999.
# latency-tracking-info-percentiles 50 99 99.9

############################# event notification ##############################

# redis can notify pub/sub clients about events happening in the key space.
# this feature is documented at https://redis.io/topics/notifications
#
# for instance if keyspace events notification is enabled, and a client
# performs a del operation on key "foo" stored in the database 0, two
# messages will be published via pub/sub:
#
# publish __keyspace@0__:foo del
# publish __keyevent@0__:del foo
#
# it is possible to select the events that redis will notify among a set
# of classes. every class is identified by a single character:
#
#  k     keyspace events, published with __keyspace@<db>__ prefix.
#  e     keyevent events, published with __keyevent@<db>__ prefix.
#  g     generic commands (non-type specific) like del, expire, rename, ...
#  $     string commands
#  l     list commands
#  s     set commands
#  h     hash commands
#  z     sorted set commands
#  x     expired events (events generated every time a key expires)
#  e     evicted events (events generated when a key is evicted for maxmemory)
#  n     new key events (note: not included in the 'a' class)
#  t     stream commands
#  d     module key type events
#  m     key-miss events (note: it is not included in the 'a' class)
#  a     alias for g$lshzxetd, so that the "ake" string means all the events
#        (except key-miss events which are excluded from 'a' due to their
#         unique nature).
#
#  the "notify-keyspace-events" takes as argument a string that is composed
#  of zero or multiple characters. the empty string means that notifications
#  are disabled.
#
#  example: to enable list and generic events, from the point of view of the
#           event name, use:
#
#  notify-keyspace-events elg
#
#  example 2: to get the stream of the expired keys subscribing to channel
#             name __keyevent@0__:expired use:
#
#  notify-keyspace-events ex
#
#  by default all notifications are disabled because most users don't need
#  this feature and the feature has some overhead. note that if you don't
#  specify at least one of k or e, no events will be delivered.
notify-keyspace-events ""

############################### advanced config ###############################

# hashes are encoded using a memory efficient data structure when they have a
# small number of entries, and the biggest entry does not exceed a given
# threshold. these thresholds can be configured using the following directives.
hash-max-listpack-entries 512
hash-max-listpack-value 64

# lists are also encoded in a special way to save a lot of space.
# the number of entries allowed per internal list node can be specified
# as a fixed maximum size or a maximum number of elements.
# for a fixed maximum size, use -5 through -1, meaning:
# -5: max size: 64 kb  <-- not recommended for normal workloads
# -4: max size: 32 kb  <-- not recommended
# -3: max size: 16 kb  <-- probably not recommended
# -2: max size: 8 kb   <-- good
# -1: max size: 4 kb   <-- good
# positive numbers mean store up to _exactly_ that number of elements
# per list node.
# the highest performing option is usually -2 (8 kb size) or -1 (4 kb size),
# but if your use case is unique, adjust the settings as necessary.
list-max-listpack-size -2

# lists may also be compressed.
# compress depth is the number of quicklist ziplist nodes from *each* side of
# the list to *exclude* from compression.  the head and tail of the list
# are always uncompressed for fast push/pop operations.  settings are:
# 0: disable all list compression
# 1: depth 1 means "don't start compressing until after 1 node into the list,
#    going from either the head or tail"
#    so: [head]->node->node->...->node->[tail]
#    [head], [tail] will always be uncompressed; inner nodes will compress.
# 2: [head]->[next]->node->node->...->node->[prev]->[tail]
#    2 here means: don't compress head or head->next or tail->prev or tail,
#    but compress all nodes between them.
# 3: [head]->[next]->[next]->node->node->...->node->[prev]->[prev]->[tail]
# etc.
list-compress-depth 0

# sets have a special encoding in just one case: when a set is composed
# of just strings that happen to be integers in radix 10 in the range
# of 64 bit signed integers.
# the following configuration setting sets the limit in the size of the
# set in order to use this special memory saving encoding.
set-max-intset-entries 512

# similarly to hashes and lists, sorted sets are also specially encoded in
# order to save a lot of space. this encoding is only used when the length and
# elements of a sorted set are below the following limits:
zset-max-listpack-entries 128
zset-max-listpack-value 64

# hyperloglog sparse representation bytes limit. the limit includes the
# 16 bytes header. when an hyperloglog using the sparse representation crosses
# this limit, it is converted into the dense representation.
#
# a value greater than 16000 is totally useless, since at that point the
# dense representation is more memory efficient.
#
# the suggested value is ~ 3000 in order to have the benefits of
# the space efficient encoding without slowing down too much pfadd,
# which is o(n) with the sparse encoding. the value can be raised to
# ~ 10000 when cpu is not a concern, but space is, and the data set is
# composed of many hyperloglogs with cardinality in the 0 - 15000 range.
hll-sparse-max-bytes 3000

# streams macro node max size / items. the stream data structure is a radix
# tree of big nodes that encode multiple items inside. using this configuration
# it is possible to configure how big a single node can be in bytes, and the
# maximum number of items it may contain before switching to a new node when
# appending new stream entries. if any of the following settings are set to
# zero, the limit is ignored, so for instance it is possible to set just a
# max entries limit by setting max-bytes to 0 and max-entries to the desired
# value.
stream-node-max-bytes 4096
stream-node-max-entries 100

# active rehashing uses 1 millisecond every 100 milliseconds of cpu time in
# order to help rehashing the main redis hash table (the one mapping top-level
# keys to values). the hash table implementation redis uses (see dict.c)
# performs a lazy rehashing: the more operation you run into a hash table
# that is rehashing, the more rehashing "steps" are performed, so if the
# server is idle the rehashing is never complete and some more memory is used
# by the hash table.
#
# the default is to use this millisecond 10 times every second in order to
# actively rehash the main dictionaries, freeing memory when possible.
#
# if unsure:
# use "activerehashing no" if you have hard latency requirements and it is
# not a good thing in your environment that redis can reply from time to time
# to queries with 2 milliseconds delay.
#
# use "activerehashing yes" if you don't have such hard requirements but
# want to free memory asap when possible.
activerehashing yes

# the client output buffer limits can be used to force disconnection of clients
# that are not reading data from the server fast enough for some reason (a
# common reason is that a pub/sub client can't consume messages as fast as the
# publisher can produce them).
#
# the limit can be set differently for the three different classes of clients:
#
# normal -> normal clients including monitor clients
# replica -> replica clients
# pubsub -> clients subscribed to at least one pubsub channel or pattern
#
# the syntax of every client-output-buffer-limit directive is the following:
#
# client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
#
# a client is immediately disconnected once the hard limit is reached, or if
# the soft limit is reached and remains reached for the specified number of
# seconds (continuously).
# so for instance if the hard limit is 32 megabytes and the soft limit is
# 16 megabytes / 10 seconds, the client will get disconnected immediately
# if the size of the output buffers reach 32 megabytes, but will also get
# disconnected if the client reaches 16 megabytes and continuously overcomes
# the limit for 10 seconds.
#
# by default normal clients are not limited because they don't receive data
# without asking (in a push way), but just after a request, so only
# asynchronous clients may create a scenario where data is requested faster
# than it can read.
#
# instead there is a default limit for pubsub and replica clients, since
# subscribers and replicas receive data in a push fashion.
#
# note that it doesn't make sense to set the replica clients output buffer
# limit lower than the repl-backlog-size config (partial sync will succeed
# and then replica will get disconnected).
# such a configuration is ignored (the size of repl-backlog-size will be used).
# this doesn't have memory consumption implications since the replica client
# will share the backlog buffers memory.
#
# both the hard or the soft limit can be disabled by setting them to zero.
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60

# client query buffers accumulate new commands. they are limited to a fixed
# amount by default in order to avoid that a protocol desynchronization (for
# instance due to a bug in the client) will lead to unbound memory usage in
# the query buffer. however you can configure it here if you have very special
# needs, such us huge multi/exec requests or alike.
#
# client-query-buffer-limit 1gb

# in some scenarios client connections can hog up memory leading to oom
# errors or data eviction. to avoid this we can cap the accumulated memory
# used by all client connections (all pubsub and normal clients). once we
# reach that limit connections will be dropped by the server freeing up
# memory. the server will attempt to drop the connections using the most 
# memory first. we call this mechanism "client eviction".
#
# client eviction is configured using the maxmemory-clients setting as follows:
# 0 - client eviction is disabled (default)
#
# a memory value can be used for the client eviction threshold,
# for example:
# maxmemory-clients 1g
#
# a percentage value (between 1% and 100%) means the client eviction threshold
# is based on a percentage of the maxmemory setting. for example to set client
# eviction at 5% of maxmemory:
# maxmemory-clients 5%

# in the redis protocol, bulk requests, that are, elements representing single
# strings, are normally limited to 512 mb. however you can change this limit
# here, but must be 1mb or greater
#
# proto-max-bulk-len 512mb

# redis calls an internal function to perform many background tasks, like
# closing connections of clients in timeout, purging expired keys that are
# never requested, and so forth.
#
# not all tasks are performed with the same frequency, but redis checks for
# tasks to perform according to the specified "hz" value.
#
# by default "hz" is set to 10. raising the value will use more cpu when
# redis is idle, but at the same time will make redis more responsive when
# there are many keys expiring at the same time, and timeouts may be
# handled with more precision.
#
# the range is between 1 and 500, however a value over 100 is usually not
# a good idea. most users should use the default of 10 and raise this up to
# 100 only in environments where very low latency is required.
hz 10

# normally it is useful to have an hz value which is proportional to the
# number of clients connected. this is useful in order, for instance, to
# avoid too many clients are processed for each background task invocation
# in order to avoid latency spikes.
#
# since the default hz value by default is conservatively set to 10, redis
# offers, and enables by default, the ability to use an adaptive hz value
# which will temporarily raise when there are many connected clients.
#
# when dynamic hz is enabled, the actual configured hz will be used
# as a baseline, but multiples of the configured hz value will be actually
# used as needed once more clients are connected. in this way an idle
# instance will use very little cpu time while a busy instance will be
# more responsive.
dynamic-hz yes

# when a child rewrites the aof file, if the following option is enabled
# the file will be fsync-ed every 4 mb of data generated. this is useful
# in order to commit the file to the disk more incrementally and avoid
# big latency spikes.
aof-rewrite-incremental-fsync yes

# when redis saves rdb file, if the following option is enabled
# the file will be fsync-ed every 4 mb of data generated. this is useful
# in order to commit the file to the disk more incrementally and avoid
# big latency spikes.
rdb-save-incremental-fsync yes

# redis lfu eviction (see maxmemory setting) can be tuned. however it is a good
# idea to start with the default settings and only change them after investigating
# how to improve the performances and how the keys lfu change over time, which
# is possible to inspect via the object freq command.
#
# there are two tunable parameters in the redis lfu implementation: the
# counter logarithm factor and the counter decay time. it is important to
# understand what the two parameters mean before changing them.
#
# the lfu counter is just 8 bits per key, it's maximum value is 255, so redis
# uses a probabilistic increment with logarithmic behavior. given the value
# of the old counter, when a key is accessed, the counter is incremented in
# this way:
#
# 1. a random number r between 0 and 1 is extracted.
# 2. a probability p is calculated as 1/(old_value*lfu_log_factor+1).
# 3. the counter is incremented only if r < p.
#
# the default lfu-log-factor is 10. this is a table of how the frequency
# counter changes with a different number of accesses with different
# logarithmic factors:
#
# +--------+------------+------------+------------+------------+------------+
# | factor | 100 hits   | 1000 hits  | 100k hits  | 1m hits    | 10m hits   |
# +--------+------------+------------+------------+------------+------------+
# | 0      | 104        | 255        | 255        | 255        | 255        |
# +--------+------------+------------+------------+------------+------------+
# | 1      | 18         | 49         | 255        | 255        | 255        |
# +--------+------------+------------+------------+------------+------------+
# | 10     | 10         | 18         | 142        | 255        | 255        |
# +--------+------------+------------+------------+------------+------------+
# | 100    | 8          | 11         | 49         | 143        | 255        |
# +--------+------------+------------+------------+------------+------------+
#
# note: the above table was obtained by running the following commands:
#
#   redis-benchmark -n 1000000 incr foo
#   redis-cli object freq foo
#
# note 2: the counter initial value is 5 in order to give new objects a chance
# to accumulate hits.
#
# the counter decay time is the time, in minutes, that must elapse in order
# for the key counter to be divided by two (or decremented if it has a value
# less <= 10).
#
# the default value for the lfu-decay-time is 1. a special value of 0 means to
# decay the counter every time it happens to be scanned.
#
# lfu-log-factor 10
# lfu-decay-time 1

########################### active defragmentation #######################
#
# what is active defragmentation?
# -------------------------------
#
# active (online) defragmentation allows a redis server to compact the
# spaces left between small allocations and deallocations of data in memory,
# thus allowing to reclaim back memory.
#
# fragmentation is a natural process that happens with every allocator (but
# less so with jemalloc, fortunately) and certain workloads. normally a server
# restart is needed in order to lower the fragmentation, or at least to flush
# away all the data and create it again. however thanks to this feature
# implemented by oran agra for redis 4.0 this process can happen at runtime
# in a "hot" way, while the server is running.
#
# basically when the fragmentation is over a certain level (see the
# configuration options below) redis will start to create new copies of the
# values in contiguous memory regions by exploiting certain specific jemalloc
# features (in order to understand if an allocation is causing fragmentation
# and to allocate it in a better place), and at the same time, will release the
# old copies of the data. this process, repeated incrementally for all the keys
# will cause the fragmentation to drop back to normal values.
#
# important things to understand:
#
# 1. this feature is disabled by default, and only works if you compiled redis
#    to use the copy of jemalloc we ship with the source code of redis.
#    this is the default with linux builds.
#
# 2. you never need to enable this feature if you don't have fragmentation
#    issues.
#
# 3. once you experience fragmentation, you can enable this feature when
#    needed with the command "config set activedefrag yes".
#
# the configuration parameters are able to fine tune the behavior of the
# defragmentation process. if you are not sure about what they mean it is
# a good idea to leave the defaults untouched.

# active defragmentation is disabled by default
# activedefrag no

# minimum amount of fragmentation waste to start active defrag
# active-defrag-ignore-bytes 100mb

# minimum percentage of fragmentation to start active defrag
# active-defrag-threshold-lower 10

# maximum percentage of fragmentation at which we use maximum effort
# active-defrag-threshold-upper 100

# minimal effort for defrag in cpu percentage, to be used when the lower
# threshold is reached
# active-defrag-cycle-min 1

# maximal effort for defrag in cpu percentage, to be used when the upper
# threshold is reached
# active-defrag-cycle-max 25

# maximum number of set/hash/zset/list fields that will be processed from
# the main dictionary scan
# active-defrag-max-scan-fields 1000

# jemalloc background thread for purging will be enabled by default
jemalloc-bg-thread yes

# it is possible to pin different threads and processes of redis to specific
# cpus in your system, in order to maximize the performances of the server.
# this is useful both in order to pin different redis threads in different
# cpus, but also in order to make sure that multiple redis instances running
# in the same host will be pinned to different cpus.
#
# normally you can do this using the "taskset" command, however it is also
# possible to this via redis configuration directly, both in linux and freebsd.
#
# you can pin the server/io threads, bio threads, aof rewrite child process, and
# the bgsave child process. the syntax to specify the cpu list is the same as
# the taskset command:
#
# set redis server/io threads to cpu affinity 0,2,4,6:
# server_cpulist 0-7:2
#
# set bio threads to cpu affinity 1,3:
# bio_cpulist 1,3
#
# set aof rewrite child process to cpu affinity 8,9,10,11:
# aof_rewrite_cpulist 8-11
#
# set bgsave child process to cpu affinity 1,10,11
# bgsave_cpulist 1,10-11

# in some cases redis will emit warnings and even refuse to start if it detects
# that the system is in bad state, it is possible to suppress these warnings
# by setting the following config which takes a space delimited list of warnings
# to suppress
#
# ignore-warnings arm64-cow-bug

tree /data/redis/

docker compose up -d

docker compose exec redis /bin/bash

redis-cli -a 123456