安装Docker step by step

1. 系统要求

  centos7以上   使用cat /etc/redhat-release查看系统版本，个人Centos 7.6

  centos-extra 仓库 enable，默认是打开的

2.安装docker

docer安装分为联网安装和离线安装两种安装 方式，

第一种 在有外网环境下安装docker,通常使用yum安装，我是在本地虚拟机上安装的

 2.1 手动在yum源添加 docer仓库

      touch /etc/yum.repos.d/docker.repo 

      在这个仓库文件中添加以下内容：

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=0 #我把这里设置成了0、说明我信任了这个源，不对它的rpm进行检察

gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-debuginfo]
name=Docker CE Stable - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-source]
name=Docker CE Stable - Sources
baseurl=https://download.docker.com/linux/centos/7/source/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge]
name=Docker CE Edge - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge-debuginfo]
name=Docker CE Edge - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge-source]
name=Docker CE Edge - Sources
baseurl=https://download.docker.com/linux/centos/7/source/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test]
name=Docker CE Test - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test-debuginfo]
name=Docker CE Test - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test-source]
name=Docker CE Test - Sources
baseurl=https://download.docker.com/linux/centos/7/source/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

 2.2  yum makecache   就是把服务器的包信息下载到本地电脑缓存起来

 2.3  sudo  yum install docker-ce 安装最新版本的docker

         

 

 

       固然也能够查看仓库中全部的docker版本，选择特定版本安装

  yum list docker-ce --showduplicates | sort -r    
  好比 sudo yum install  docker-ce-17.12.0.ce

2.4 查看docker是否安装成功
    docker version 或者 docker info

2.5 启动docker
    sudo systemctl start docker 
  

 第二种 离线安装方式

   下载.rmp文件，而且手动安装。下载网址：https://download.docker.com/linux/centos/7/x86_64/stable/Packages/

   

   docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm 
  docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm 

 

 配置镜像加速器

针对Docker客户端版本大于 1.10.0 的用户

能够经过修改daemon配置文件/etc/docker/daemon.json来使用加速器，若是daemon.json文件不存在，就建立一个

    cd /etc/docker

    touch daemon.json 

添加以下内容
{
  "registry-mirrors": ["https://mrkxppsh.mirror.aliyuncs.com"]
}
sudo systemctl daemon-reload
sudo systemctl restart docker