我要评论1、查看系统要求
docker 要求 centos 系统的内核版本高于 3.10 ,查看centos的内核版本。
uname -a
2、删除旧版本
yum remove docker docker-common docker-selinux docker-engine
3、安装需要的软件包
yum-util 提供yum-config-manager功能，另外两个是devicemapper驱动依赖的
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
4、设置docker yum源
# 使用官方源 sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo # 使用阿里源 sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo sudo sed -i 's+download.docker.com+mirrors.aliyun.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo
5、查看所有仓库中所有docker版本
可以查看所有仓库中所有docker版本,并选择特定的版本安装。
yum list docker-ce --showduplicates | sort -r
6、安装docker
sh
sudo yum install docker-ce
由于repo中默认只开启stable仓库，故这里安装的是最新稳18.03.0.ce-1.el7.centos。
如果要安装特定版本：
sudo yum install docker-ce-18.06.1.ce
7、启动
设置为开机启动
systemctl enable docker
启动
systemctl start docker
查看启动状态
systemctl status docker
如果出现异常
$ systemctl start docker a dependency job for docker.service failed. see 'journalctl -xe' for details.
查看报错信息
mar 03 11:19:47 master1 systemd[1]: starting containerd container runtime... -- subject: unit containerd.service has begun start-up -- defined-by: systemd -- support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- unit containerd.service has begun starting up. mar 03 11:19:47 master1 systemd[104332]: failed at step limits spawning /sbin/modprobe: operation not permitted -- subject: process /sbin/modprobe could not be executed -- defined-by: systemd -- support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- the process /sbin/modprobe could not be executed and failed. -- -- the error number returned by this process is 1. mar 03 11:19:47 master1 systemd[104335]: failed at step limits spawning /usr/bin/containerd: operation not permitted -- subject: process /usr/bin/containerd could not be executed -- defined-by: systemd -- support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- the process /usr/bin/containerd could not be executed and failed.
解决方案：
查看open files的值，修改/usr/lib/systemd/system/docker.service和/usr/lib/systemd/system/containerd.service（如下图），启动即可
$ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 23056 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 654350 pipe size (512 bytes, -p) 8 posix message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 23056 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
$ vim /usr/lib/systemd/system/docker.service ... # having non-zero limit*s causes performance problems due to accounting overhead # in the kernel. we recommend using cgroups to do container-local accounting. limitnofile=654349 # 注意这里 limitnproc=23057 limitcore=infinity # comment tasksmax if your systemd version does not supports it. ...
$ vim /usr/lib/systemd/system/containerd.service ... # having non-zero limit*s causes performance problems due to accounting overhead # in the kernel. we recommend using cgroups to do container-local accounting. limitnofile=654349 # 注意这里 limitnproc=23057 limitcore=infinity # comment tasksmax if your systemd version does not support it. ...
查看版本
docker version
8、修改数据目录
方式一
# 将下面的json拷贝纸docker启动目录
$ vim /etc/docker/daemon.json
{
"data-root": "/data/docker"
}方式二
查看docker当前信息
$ docker info client: context: default debug mode: false plugins: app: docker app (docker inc., v0.9.1-beta3) buildx: docker buildx (docker inc., v0.8.2-docker) scan: docker scan (docker inc., v0.17.0) server: containers: 40 running: 15 paused: 0 stopped: 25 images: 91 server version: 20.10.17 storage driver: overlay2 backing filesystem: extfs supports d_type: true native overlay diff: true userxattr: false logging driver: json-file cgroup driver: systemd cgroup version: 1 plugins: volume: local network: bridge host ipvlan macvlan null overlay log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog swarm: inactive runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc default runtime: runc init binary: docker-init containerd version: 10c12954828e7c7c9b6e0ea9b0c02b01407d3ae1 runc version: v1.1.2-0-ga916309f init version: de40ad0 security options: seccomp profile: default kernel version: 3.10.0-1160.71.1.el7.x86_64 operating system: centos linux 7 (core) ostype: linux architecture: x86_64 cpus: 16 total memory: 15.5gib name: master1 id: 3wqc:qctb:i5d4:2zwl:vbsh:6gwq:4w2g:btk2:xsey:pdxg:bqai:zb6d docker root dir: /data/docker # 这里是数据目录的位置，我因为已经更改过，原位置为/var/lib/docker debug mode: false registry: https://index.docker.io/v1/ labels: experimental: false insecure registries: 127.0.0.0/8 registry mirrors: https://x6u7jv2l.mirror.aliyuncs.com/ live restore enabled: false
9、停止docker服务
$ systemctl stop docker
10、修改docker服务启动文件
vi /usr/lib/systemd/system/docker.service execstart=/usr/bin/dockerd -h fd:// --containerd=/run/containerd/containerd.sock --graph=/data/docker
11、复制原有数据，若无数据，可跳过此步骤
$ cp -rf /var/lib/docker/* /data/docker/
12、重新加载配置文件并启动
$ systemctl daemon-reload $ systemctl start docker
最后执行步骤8，查看是否已启动
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