CentOS 7.9 离线安装 Docker

在 CentOS 7.9 上安装 Docker 还是挺简单的，跟安装别的软件差不多，基本上也是老三样：下载文件，解压、配置环境变量， 配置服务脚本。
下面就来快速看下具体细节：

1. 下载文件

   https://download.docker.com/linux/static/stable/x86_64/docker-20.10.9.tgz
   
   

2. 解压、配置环境变量

   tar -xvf docker-20.10.9.tgz -C /opt/
   
   # 将可执行文件放在 /usr/bin 下可省去配置环境变量，生产环境暂不建议这么使用
   cp /opt/docker/* /usr/bin/
   
   

3. 配置服务脚本

   vim /etc/systemd/system/docker.service

   [Unit]
   Description=Docker Application Container Engine
   Documentation=https://docs.docker.com
   After=network-online.target firewalld.service
   Wants=network-online.target
     
   [Service]
   Type=notify
   ExecStart=/usr/bin/dockerd --selinux-enabled=false --insecure-registry=127.0.0.1
   ExecReload=/bin/kill -s HUP $MAINPID
   LimitNOFILE=infinity
   LimitNPROC=infinity
   LimitCORE=infinity
   TimeoutStartSec=0
   Delegate=yes
   KillMode=process
   Restart=on-failure
   StartLimitBurst=3
   StartLimitInterval=60s
     
   [Install]
   WantedBy=multi-user.target
   
   

   设置开机启动

   
   [root@node108 opt]# ll /etc/systemd/system/docker.service 
   -rwxrwxrwx. 1 root root 1198 Oct 22 11:18 /etc/systemd/system/docker.service
   [root@node108 opt]# systemctl daemon-reload  
   [root@node108 opt]# systemctl enable docker.service
   Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /etc/systemd/system/docker.service.
   
   

   验证是否可以正确启动

   [root@node108 opt]# systemctl start docker
   [root@node108 opt]# systemctl status docker
   ● docker.service - Docker Application Container Engine
      Loaded: loaded (/etc/systemd/system/docker.service; enabled; vendor preset: disabled)
      Active: active (running) since Sat 2022-10-22 11:19:33 EDT; 5s ago
        Docs: https://docs.docker.com
    Main PID: 16238 (dockerd)
       Tasks: 15
      Memory: 30.7M
      CGroup: /system.slice/docker.service
              ├─16238 /usr/bin/dockerd --selinux-enabled=false --insecure-registry=127.0.0.1
              └─16243 containerd --config /var/run/docker/containerd/containerd.toml --log-level info
   
   Oct 22 11:19:32 node108 dockerd[16238]: time="2022-10-22T11:19:32.811050263-04:00" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///var/run/docker/containe... module=grpc
   Oct 22 11:19:32 node108 dockerd[16238]: time="2022-10-22T11:19:32.811055654-04:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
   Oct 22 11:19:32 node108 dockerd[16238]: time="2022-10-22T11:19:32.818039023-04:00" level=info msg="[graphdriver] using prior storage driver: overlay2"
   Oct 22 11:19:32 node108 dockerd[16238]: time="2022-10-22T11:19:32.832913520-04:00" level=info msg="Loading containers: start."
   Oct 22 11:19:32 node108 dockerd[16238]: time="2022-10-22T11:19:32.930173146-04:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daem... IP address"
   Oct 22 11:19:32 node108 dockerd[16238]: time="2022-10-22T11:19:32.961657503-04:00" level=info msg="Loading containers: done."
   Oct 22 11:19:33 node108 dockerd[16238]: time="2022-10-22T11:19:33.050149793-04:00" level=info msg="Docker daemon" commit=79ea9d3 graphdriver(s)=overlay2 version=20.10.9
   Oct 22 11:19:33 node108 dockerd[16238]: time="2022-10-22T11:19:33.050196710-04:00" level=info msg="Daemon has completed initialization"
   Oct 22 11:19:33 node108 systemd[1]: Started Docker Application Container Engine.
   Oct 22 11:19:33 node108 dockerd[16238]: time="2022-10-22T11:19:33.076929072-04:00" level=info msg="API listen on /var/run/docker.sock"
   Hint: Some lines were ellipsized, use -l to show in full.
   [root@node108 opt]#