apt-get remove docker docker-engine docker.io
apt-get install apt-transport-https ca-certificates curl gnupg2 software-properties-common
apt-get install lsb-release
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
add-apt-repository \
   "deb [arch=amd64] https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
apt-get update
apt-get install docker-ce docker-ce-cli containerd.io

systemctl enable docker
service docker start

{
  "registry-mirrors": [
    "https://docker.mirrors.ustc.edu.cn"
  ],
  "insecure-registries": [
    "http://192.168.0.56:5000"
  ],
  "debug": false,
  "experimental": false,
  "features": {
    "buildkit": true
  },
  "builder": {
    "gc": {
      "enabled": true,
      "defaultKeepStorage": "20GB"
    }
  }
}