上官网一查：

https://docs.docker.com/install/linux/docker-ce/ubuntu/

好活！

安装镜像源

sudo apt-get remove docker docker-engine docker.io containerd runc

sudo apt update

sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository  "deb [arch=amd64] https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu $(lsb_release -cs) stable"

sudo apt-get install docker-ce

测试是否安装成功

sudo docker run hello-world

输出：

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:f9dfddf63636d84ef479d645ab5885156ae030f611a56f3a7ac7f2fdd86d7e4e
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

加入用户组

$ sudo groupadd docker

groupadd：“docker”组已存在

$ sudo usermod -aG docker $USER

docker服务启动停止

# 启动docker

sudo service docker start

# 停止docker

sudo service docker stop

# 重启docker

sudo service docker restart

卸载 docker

sudo apt-get purge docker-ce

sudo rm -rf /var/lib/docker