安装Docker

1.首先使用uname -r命令查看一下内核发行版本号（我的是3.10.0-1160.e17.x86_64）

2.然后使用cat /etc/os-release命令查看一下系统的版本（我的是Centos7）

3.安装之前请先执行下面命令卸载掉旧的docker

sudo yum remove docker                   docker-client                   docker-client-latest                   docker-common                   docker-latest                   docker-latest-logrotate                   docker-logrotate                   docker-engine

4.安装需要的安装包

sudo yum install -y yum-utils

5.设置镜像的仓库

sudo yum-config-manager     --add-repo     https://download.docker.com/linux/centos/docker-ce.repo   #默认是设置国外的镜像地址
sudo yum-config-manager     --add-repo     http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo   #推荐使用阿里云国内的镜像地址

6.更新yum软件包索引

sudo yum makecache fast

7.安装docker相关的    docker-ce是社区版本  ee是企业版本

sudo yum install docker-ce docker-ce-cli containerd.io

8.启动docker

sudo systemctl start docker

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 9.查看docker是否安装成功

docker version

10.运行docker hello world程序

sudo docker run hello-world

11.查看一下下载的这个hello-world镜像

docker images

卸载Docker

1.卸载依赖

sudo yum remove docker-ce docker-ce-cli containerd.io

2.删除资源

 sudo rm -rf /var/lib/docker
 sudo rm -rf /var/lib/containerd

Docker入门第二章