Ubuntu下安装docker

链接地址：Install Docker Engine on Ubuntu | Docker Documentation

两种方式：建议使用第一种方式

1，Install using the repository使用仓库安装

2，Install from a package使用.deb包安装

从https://download.docker.com/linux/ubuntu/dists/bionic/pool/stable/amd64/下载选择的deb

 sudo dpkg -i docker-ce_18.09.0~3-0~ubuntu-bionic_amd64.deb 

3，测试是否安装成功

 sudo docker run hello-world 

运行结果如下所示：

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/