1.下载3个docker离线安装包，下载网址：

https://download.docker.com/linux/ubuntu/dists/xenial/pool/stable/amd64/

2.把3个离线安装包拷贝到ubuntu本地执行以下命令

sudo dpkg -i containerd.io_1.4.6-1_amd64.deb
sudo dpkg -i docker-ce-cli_20.10.7~3-0~ubuntu-xenial_amd64.deb
sudo dpkg -i docker-ce_20.10.7~3-0~ubuntu-xenial_amd64.deb

3.启动doakcer

sudo systemctl start docker

4.查看docker状态

sudo systemctl status docker

5.设置Docker的开机自启动

sudo systemctl enable docker.service    

6.查看开机自启动是否添加成功

sudo systemctl  list-unit-files |grep docker