使用国内源为Ubuntu18.04安装Docker

(使用中科大镜像源，同时支持PC与ARM设备)

1.添加源文件/etc/apt/sources.list.d/ustc.list

(也可以直接修改原来的/etc/apt/sources.list)

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-proposed main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-proposed main multiverse restricted universe
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
#deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe

2.安装必要工具

sudo apt-get update\
sudo apt-get -y install \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common

3.添加软件源的 GPG 密钥

curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

4.向 source.list 中添加 Docker 软件源

sudo add-apt-repository \
    "deb https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu \
    $(lsb_release -cs) \
    stable"

5.更新缓存并安装docker

sudo apt-get update
sudo apt-get -y install docker-ce

6.创建用户组并添加当前用户

sudo groupadd docker
sudo usermod -aG docker $USER