安装Docker及配置Docker开机自启动

安装Docker

1. 下载docker包：
   下载地址
   本例下载docker-20.10.9.tgz

2. 将文件上传到centos系统：
   可使用xftp直接上传或

   # 上传到Centos系统/data/目录
   scp docker-20.10.9.tgz root@ip地址:/data/
   

3. 进入到data目录，解压docker包

   cd /data
   tar -zxvf docker-20.10.9.tgz
   

4. 将解压缩出来的docker文件内容移动到/user/bin/目录下

   cp docker/* /usr/bin/
   

5. 查看docker版本

   docker version
   

6. 查看docker信息

   docker info
   

配置docker 开机自启动服务

1. 添加docker.service文件

   vi /etc/systemd/system/docker.service
   

   按i插入模式，复制如下内容：

   [Unit]
   Description=Docker Application Container Engine
   Documentation=https://docs.docker.com
   After=network-online.target firewalld.service
   Wants=network-online.target
   
   [Service]
   Type=notify
   # the default is not to use systemd for cgroups because the delegate issues still
   # exists and systemd currently does not support the cgroup feature set required
   # for containers run by docker
   ExecStart=/usr/bin/dockerd
   ExecReload=/bin/kill -s HUP $MAINPID
   # 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=infinity
   LimitNPROC=infinity
   LimitCORE=infinity
   # Uncomment TasksMax if your systemd version supports it.
   # Only systemd 226 and above support this version.
   #TasksMax=infinity
   TimeoutStartSec=0
   # set delegate yes so that systemd does not reset the cgroups of docker containers
   Delegate=yes
   # kill only the docker process, not all processes in the cgroup
   KillMode=process
   # restart the docker process if it exits prematurely
   Restart=on-failure
   StartLimitBurst=3
   StartLimitInterval=60s
   
   [Install]
   WantedBy=multi-user.target
   

   按esc退出insert模式，输入：wq退出编辑

2. 添加文件可执行权限

   chmod +x /etc/systemd/system/docker.service
   

3. 重新加载配置文件

   systemctl daemon-reload
   

4. 启动docker

   systemctl start docker
   

5. 查看docker启动状态

   systemctl status docker
   

6. 查看启动容器

   docker ps
   

7. 设置开机自启动

   systemctl enable docker.service
   

8. 查看docker开机启动状态 enabled:开启, disabled:关闭

   systemctl is-enabled docker.service