sudo apt update
sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
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
apt list -a docker-ce
sudo apt install docker-ce=5:20.10.12~3-0~ubuntu-focal docker-ce-cli=5:20.10.12~3-0~ubuntu-focal containerd.io
systemctl status docker
vim /etc/sysconfig/docker
cd /etc/docker/
ll
vim daemon.json
// 解决：如果是配置了国内镜像，并且镜像文件为/etc/docker/daemon.json，则修改文件后缀为.conf即可正常启动docker 服务
mv daemon.json daemon.conf
ll
systemctl start docker
systemctl status docker
