卸载老版本docker
sudo apt-get remove docker docker-engine docker.io
/var/lib/docker/目录下存放着 images, containers, volumes, and networks
安装docker
$ sudo apt-get update
$ sudo apt-get install
apt-transport-https
ca-certificates
curl
software-properties-common
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
$ sudo apt-key fingerprint 0EBFCD88
$ sudo add-apt-repository
"deb [arch=amd64] https://download.docker.com/linux/ubuntu
$(lsb_release -cs)
stable"
$ sudo apt-get update
$ sudo apt-get install docker-ce
$ sudo docker run hello-world
$sudo docker run hello-world