我要评论redis cluster采用无中心结构，每个节点保存数据和整个集群状态,每个节点都和其他所有节点连接。
redis cluster提供了一种运行redis安装的方法，在该安装中，数据会 在多个redis节点之间自动分片。redis cluster 在分区期间还提供了一定程度的可用性，这实际上是在某些节点出现故障或无法通信时继续操作的能力。但是，如果发生较大故障（例如，大多数主服务器不可用时），集群将停止运行。redis cluster自动分割在多个节点之间的数据集，一部分节点出现故障或无法与集群的其余部分通信时，继续运行的能力。
创建网卡
docker network create redis --subnet 172.28.0.0/16
redis配置
通过脚本创建6个 redis 配置
for port in $(seq 1 6); \
do \
mkdir -p ~/redis/node-${port}/conf
touch ~/redis/node-${port}/conf/redis.conf
cat << eof > ~/redis/node-${port}/conf/redis.conf
port 6379
bind 0.0.0.0
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
cluster-announce-ip 172.28.0.1${port}
cluster-announce-port 6379
cluster-announce-bus-port 16379
appendonly yes
eof
done运行容器
# 容器1 docker run -p 6371:6379 -p 16371:16379 --name redis-1 \ -v ~/redis/node-1/data:/data \ -v ~/redis/node-1/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.11 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器2 docker run -p 6372:6379 -p 16372:16379 --name redis-2 \ -v ~/redis/node-2/data:/data \ -v ~/redis/node-2/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.12 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器3 docker run -p 6373:6379 -p 16373:16379 --name redis-3 \ -v ~/redis/node-3/data:/data \ -v ~/redis/node-3/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.13 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器4 docker run -p 6374:6379 -p 16374:16379 --name redis-4 \ -v ~/redis/node-4/data:/data \ -v ~/redis/node-4/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.14 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器5 docker run -p 6375:6379 -p 16375:16379 --name redis-5 \ -v ~/redis/node-5/data:/data \ -v ~/redis/node-5/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.15 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf # 容器6 docker run -p 6376:6379 -p 16376:16379 --name redis-6 \ -v ~/redis/node-6/data:/data \ -v ~/redis/node-6/conf/redis.conf:/etc/redis/redis.conf \ -d --net redis --ip 172.28.0.16 redis:5.0.9-alpine3.11 redis-server /etc/redis/redis.conf
创建集群
# 进入容器 > docker exec -it redis-1 /bin/sh # 进入容器后，在容器中创建集群 > redis-cli --cluster create 172.28.0.11:6379 172.28.0.12:6379 172.28.0.13:6379 172.28.0.14:6379 172.28.0.15:6379 172.28.0.16:6379 --cluster-replicas 1 >>> performing hash slots allocation on 6 nodes... master[0] -> slots 0 - 5460 master[1] -> slots 5461 - 10922 master[2] -> slots 10923 - 16383 adding replica 172.28.0.15:6379 to 172.28.0.11:6379 adding replica 172.28.0.16:6379 to 172.28.0.12:6379 adding replica 172.28.0.14:6379 to 172.28.0.13:6379 m: cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379 slots:[0-5460] (5461 slots) master m: 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379 slots:[5461-10922] (5462 slots) master m: be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379 slots:[10923-16383] (5461 slots) master s: 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379 replicates be4034133574260765165beac5fd1edacb63a2bd s: 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379 replicates cfb09d104f563d5dea870437cf73fac266b69a30 s: edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379 replicates 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c can i set the above configuration? (type 'yes' to accept): yes >>> nodes configuration updated >>> assign a different config epoch to each node >>> sending cluster meet messages to join the cluster waiting for the cluster to join .... >>> performing cluster check (using node 172.28.0.11:6379) m: cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379 slots:[0-5460] (5461 slots) master 1 additional replica(s) s: 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379 slots: (0 slots) slave replicates cfb09d104f563d5dea870437cf73fac266b69a30 s: edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379 slots: (0 slots) slave replicates 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c m: be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379 slots:[10923-16383] (5461 slots) master 1 additional replica(s) m: 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379 slots:[5461-10922] (5462 slots) master 1 additional replica(s) s: 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379 slots: (0 slots) slave replicates be4034133574260765165beac5fd1edacb63a2bd [ok] all nodes agree about slots configuration. >>> check for open slots... >>> check slots coverage... [ok] all 16384 slots covered. # 启动redis集群客户端（-c表示集群） > redis-cli -c # 查看集群信息 > cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 cluster_size:3 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:235 cluster_stats_messages_pong_sent:225 cluster_stats_messages_sent:460 cluster_stats_messages_ping_received:220 cluster_stats_messages_pong_received:235 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:460 # 集群创建好之后，11，12，13为主节点，其余为从节点 > cluster nodes 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379@16379 slave cfb09d104f563d5dea870437cf73fac266b69a30 0 1596856234249 5 connected edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379@16379 slave 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 0 1596856234146 6 connected cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379@16379 myself,master - 0 1596856232000 1 connected 0-5460 be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379@16379 master - 0 1596856233000 3 connected 10923-16383 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379@16379 master - 0 1596856233000 2 connected 5461-10922 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379@16379 slave be4034133574260765165beac5fd1edacb63a2bd 0 1596856233230 4 connected
运行测试
添加redis缓存
会返回所添加的对应的节点，如这里返回的是12的节点
set name weijishu -> redirected to slot [5798] located at 172.28.0.12:6379 ok
停止容器
停止刚添加缓存的对应的redis节点
docker stop redis-2
当主节点断开之后，会自动将从节点切换为主节点，比如这里将16切换为了主节点
cluster nodes 96b4185cc40b532b144b2ac3e2fe7213e7c13a50 172.28.0.15:6379@16379 slave cfb09d104f563d5dea870437cf73fac266b69a30 0 1596856365279 5 connected edd2e12510d921be2193df5b461033fc0f465144 172.28.0.16:6379@16379 master - 0 1596856367324 7 connected 5461-10922 cfb09d104f563d5dea870437cf73fac266b69a30 172.28.0.11:6379@16379 myself,master - 0 1596856365000 1 connected 0-5460 be4034133574260765165beac5fd1edacb63a2bd 172.28.0.13:6379@16379 master - 0 1596856366814 3 connected 10923-16383 47d28c2cc92ce7fafbe09b14d521a35e56a2c02c 172.28.0.12:6379@16379 master,fail - 1596856348392 1596856346000 2 connected 74685c90c5aebdc8a035d288c962e22f98e994e8 172.28.0.14:6379@16379 slave be4034133574260765165beac5fd1edacb63a2bd 0 1596856366301 4 connected
获取缓存
如果能取到值，表示集群搭建成功，如下，从16这个节点中取到了值
get name -> redirected to slot [5798] located at 172.28.0.16:6379 "weijishu"
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