Docker 要求 Ubuntu 系统的内核版本高于 3.10 ，查看本页面的前提条件来验证你的 Ubuntu 版本是否支持 Docker。

通过 uname -r 命令查看你当前的内核版本

uname -r 4.15.0-20-generic

版本是4.15所以就没问题

然后使用脚本安装Docker

1.获取最新版本的Docker安装包

wget -qO- https://get.docker.com/ | sh

安装完会有个提示：

If you would like to use Docker as a non-root user, you should now consideradding your user to the "docker" group with something like:  sudo usermod -aG docker limingxing(我的用户名)Remember that you will have to log out and back in for this to take effect!

当要以非root用户可以直接运行docker时，需要执行 sudo usermod -aG docker runoob 命令（每次都是）

2.启动docker后台服务

 sudo service docker start

3.测试运行hello world

 sudo docker run hello-world

运行结果为(可以好好读一下setps)：

Unable to find image 'hello-world:latest' locallylatest: Pulling from library/hello-world9bb5a5d4561a: Pull complete Digest: sha256:3e1764d0f546ceac4565547df2ac4907fe46f007ea229fd7ef2718514bcec35dStatus: Downloaded newer image for hello-world:latestHello 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 bashShare images, automate workflows, and more with a free Docker ID: https://hub.docker.com/For more examples and ideas, visit: https://docs.docker.com/engine/userguide/

鉴于国内网络问题，后续拉取 Docker 镜像十分缓慢，我们可以需要配置加速器来解决，我使用的是网易的镜像地址：http://hub-mirror.c.163.com。

新版的 Docker 使用 /etc/docker/daemon.json（Linux）来配置 Daemon。

请在该配置文件中加入（没有该文件的话，请先建一个）：

{  "registry-mirrors": ["http://hub-mirror.c.163.com"]}

 

 

4.15.0-20-generic