参考官方文档 https://docs.docker.com/install/linux/docker-ce/centos/

第一步, 卸载残留

sudo yum remove docker 
                  docker-client 
                  docker-client-latest 
                  docker-common 
                  docker-latest 
                  docker-latest-logrotate 
                  docker-logrotate 
                  docker-engine

第二步 ,设置仓库

先安装依赖包

sudo yum install -y yum-utils 
  device-mapper-persistent-data 
  lvm2


添加稳定仓库

sudo yum-config-manager 
    --add-repo 
    https://download.docker.com/linux/centos/docker-ce.repo

第三步 安装 docker

sudo yum install docker-ce docker-ce-cli containerd.io

安装过程中遇到错误

Error: Package: containerd.io-1.2.6-3.3.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2:2.74
Error: Package: 3:docker-ce-18.09.7-3.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2.9
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

从网上看有说使用阿里镜像直接装的,没能成功,主要是网不通

使用阿里云上的epel源

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum install epel-release
yum install container-selinux

我使用直接下载的方式进行安装

wget http://mirror.centos.org/centos/7/extras/x86_64/Packages/container-selinux-2.74-1.el7.noarch.rpm

安装依赖
yum install policycoreutils-python

安装 selinux
rpm -ivh container-selinux-2.74-1.el7.noarch.rpm

接着使用第三步安装成功

第四步 启动 docker

sudo systemctl start docker

安装完成后, 需要关心一个问题, 那就是默认的docker image会存放到 /var/lib/docker 目录, 而这个目录往往空间不大, 长期使用的话会导致磁盘满, 所以需要修改这个目录到空间大的磁盘

docker info 命令可以看到当前使用的目录

首先将docker停下来

systemctl stop docker

然后 在空间大的磁盘创建目录

mkdir /data/docker

mkdir /etc/systemd/system/docker.service.d

vi /etc/systemd/system/docker.service.d/devicemapper.conf

写入内容

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd  --graph=/data/docker

重启docker

systemctl daemon-reload
systemctl restart docker
systemctl enable docker

确定没问题后,删除原目录 rm -rf /var/lib/docker

我在设置这个目录的时候,遇到一台机器无法重启, 去掉这个配置就可以启来, 怀疑是文件 devicemapper.conf 内容写的不对,反复修改了一下, 后来又可以启动了. 猜测应该是文件里带不一些不可见的字符吧 

下面列出错误信息供参考, 解决问题的核心就是要 systemctl daemon-reload , 要把文件写对, 记得首先要把docker stop掉

Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.


使用journalctl -xe也没看出来问题


报错信息如下

-- The result is failed.
Jul 02 14:31:06 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 polkitd[828]: Unregistered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388, object path /org/freedesk
 ESC[
-- Subject: Unit docker.socket has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has begun starting up.
Jul 02 14:30:54 ignite2 systemd[1]: Listening on Docker Socket for the API.
-- Subject: Unit docker.socket has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has finished starting up.
-- 
-- The start-up result is done.
Jul 02 14:30:54 ignite2 systemd[1]: start request repeated too quickly for docker.service
Jul 02 14:30:54 ignite2 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is failed.
Jul 02 14:30:54 ignite2 systemd[1]: Unit docker.service entered failed state.
Jul 02 14:30:54 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 sudo[6219]:     root : TTY=pts/0 ; PWD=/etc/systemd/system/docker.service.d ; USER=root ; COMMAND=/bin/systemctl start docker
Jul 02 14:31:06 ignite2 sudo[6219]: pam_limits(sudo:session): unknown limit item 'noproc'
Jul 02 14:31:06 ignite2 sudo[6219]: pam_limits(sudo:session): unknown limit item 'noproc'
Jul 02 14:31:06 ignite2 polkitd[828]: Registered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388 [/usr/bin/pkttyagent --notif
Jul 02 14:31:06 ignite2 systemd[1]: start request repeated too quickly for docker.service
Jul 02 14:31:06 ignite2 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is failed.
Jul 02 14:31:06 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 polkitd[828]: Unregistered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388, object path /org/freedesk
 ESC[
-- Subject: Unit docker.socket has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has begun starting up.
Jul 02 14:30:54 ignite2 systemd[1]: Listening on Docker Socket for the API.
-- Subject: Unit docker.socket has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has finished starting up.
-- 
-- The start-up result is done.
Jul 02 14:30:54 ignite2 systemd[1]: start request repeated too quickly for docker.service
Jul 02 14:30:54 ignite2 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is failed.
Jul 02 14:30:54 ignite2 systemd[1]: Unit docker.service entered failed state.
Jul 02 14:30:54 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 sudo[6219]:     root : TTY=pts/0 ; PWD=/etc/systemd/system/docker.service.d ; USER=root ; COMMAND=/bin/systemctl start docker
Jul 02 14:31:06 ignite2 sudo[6219]: pam_limits(sudo:session): unknown limit item 'noproc'
Jul 02 14:31:06 ignite2 sudo[6219]: pam_limits(sudo:session): unknown limit item 'noproc'
Jul 02 14:31:06 ignite2 polkitd[828]: Registered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388 [/usr/bin/pkttyagent --notif
Jul 02 14:31:06 ignite2 systemd[1]: start request repeated too quickly for docker.service
Jul 02 14:31:06 ignite2 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is failed.
Jul 02 14:31:06 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 polkitd[828]: Unregistered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388, object path /org/freedesk
 ESC[
-- Subject: Unit docker.socket has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has begun starting up.
Jul 02 14:30:54 ignite2 systemd[1]: Listening on Docker Socket for the API.
-- Subject: Unit docker.socket has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.socket has finished starting up.
-- 
-- The start-up result is done.
Jul 02 14:30:54 ignite2 systemd[1]: start request repeated too quickly for docker.service
Jul 02 14:30:54 ignite2 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is failed.
Jul 02 14:30:54 ignite2 systemd[1]: Unit docker.service entered failed state.
Jul 02 14:30:54 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 sudo[6219]:     root : TTY=pts/0 ; PWD=/etc/systemd/system/docker.service.d ; USER=root ; COMMAND=/bin/systemctl start docker
Jul 02 14:31:06 ignite2 sudo[6219]: pam_limits(sudo:session): unknown limit item 'noproc'
Jul 02 14:31:06 ignite2 sudo[6219]: pam_limits(sudo:session): unknown limit item 'noproc'
Jul 02 14:31:06 ignite2 polkitd[828]: Registered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388 [/usr/bin/pkttyagent --notif
Jul 02 14:31:06 ignite2 systemd[1]: start request repeated too quickly for docker.service
Jul 02 14:31:06 ignite2 systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit docker.service has failed.
-- 
-- The result is failed.
Jul 02 14:31:06 ignite2 systemd[1]: docker.service failed.
Jul 02 14:31:06 ignite2 polkitd[828]: Unregistered Authentication Agent for unix-process:6220:8692866 (system bus name :1.388, object path /org/freedes