ubuntu18安装docker

环境准备

1. 首先把源更改为国内源，比如阿里源，清华源等，这一步之前得确保网络已配通，可以看我之前写的网络配置
2. 先备份  
3. 编辑 
4. 把原先的源注释掉，加入以下内容，保存退出

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse

     依次更新软件源及软件包：sudo apt-get update、sudo apt-get upgrade

Docker安装（参考官网）

• Install packages to allow apt to use a repository over HTTPS:

$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

• Add Docker’s official GPG key:

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

• Verify that you now have the key with the fingerprint

$ sudo apt-key fingerprint 0EBFCD88
    
pub   rsa4096 2017-02-22 [SCEA]
      9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
uid           [ unknown] Docker Release (CE deb) <[e-mail]>
sub   rsa4096 2017-02-22 [S]

• Use the following command to set up the stable repository

$ sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

• Update the apt package index

$ sudo apt-get update

• Install the latest version of Docker Engine - Community and containerd, or go to the next step to install a specific version:

$ sudo apt-get install docker-ce docker-ce-cli containerd.io

• 安装完成，检验是否安装成功：

配置镜像加速器

1. 登录阿里云，在镜像搜索那随便输入一个镜像
2. 点击“镜像搜索”后来到如下页面
3. 点击“镜像加速器”，点击操作文档下的系统，可以看到相应系统的配置信息，我们点击ubuntu即可
4. 直接把这一整段代码粘过去运行即可，至此，镜像加速器就配置完成了，之后我们即可通过加速器提升获取Docker官方镜像的速度

   ---

   参考文章：https://blog.csdn.net/qq_39506912/article/details/88974664