知识点1： CentOS7系统安装Docker


    知识点2： Ubuntu18.04系统安装Docker

    1. apt-get remove docker docker-engine docker.io containerd runc
    2. apt-get update
    3. #添加使用 https 传输的软件包和 CA证书
    4. apt-get install apt-transport-https ca-certificates curl software-properties-common -y
    5. #添加软件源的GPG密钥
    6. curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - 
    7. #添加docker软件源
    8. add-apt-repository \
    9.   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
    10.   $(lsb_release -cs) \
    11.   stable"
    12.  #安装docker-ce
    13.  apt-get install docker-ce docker-ce-cli containerd.io -y
    16.  #查找Docker-CE的版本
    17.  apt-cache madison docker-ce
    18.  #安装指定版本的Docker-CE，比如要安装19.03.8~3-0~ubuntu-bionic
    19.  apt-get -y install docker-ce=19.03.8~3-0~ubuntu-bionic
    21.  #创建daemon.json配置文件
    22.  root@node01:~# cat /etc/docker/daemon.json 
    23. {
    24.       "registry-mirrors": ["https://dockerhub.mirrors.nwafu.edu.cn/"]
    25. }
    27. #加载配置，重启docker服务
    28.  root@node01:~# systemctl daemon-reload
    29. root@node01:~# systemctl start docker
    30. root@node01:~# systemctl status docker
    31. ● docker.service - Docker Application Container Engine
    32.    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
    33.    Active: active (running) since Fri 2021-03-12 10:12:25 CST; 4h 27min ago
    34.      Docs: https://docs.docker.com
    35.  Main PID: 8774 (dockerd)
    36.     Tasks: 9
    37.    CGroup: /system.slice/docker.service
    38.            └─8774 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock