安装docker

添加阿里的repo：

apt-get update && apt-get install -y apt-transport-https
apt-get install -y apt-transport-https
apt upgrade -y
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add - 
apt-get update

安装Docker：

apt install docker-ce
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu 
$(lsb_release -cs) stable"
​
sudo apt update
sudo apt-get install docker-ce=5:19.03.15~3-0~ubuntu-focal  docker-ce-cli=5:19.03.15~3-0~ubuntu-focal containerd.io
​
mkdir -p /etc/docker
​
cat <<EOF > /etc/docker/daemon.json
​
{
  "registry-mirrors": ["https://cu2yw19m.mirror.aliyuncs.com"]
}
​
EOF

systemctl daemon-reload
systemctl restart docker
systemctl enable docker

验证docker

docker   version

docker ps  

docker   images