1：Docker的卸载与安装

参考：https://docs.docker.com/install/linux/docker-ce/centos/#os-requirements

1.1：Docker的卸载

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

1.2：Docker的安装

1.2.1：设置仓库

A：Install required packages. yum-utils provides the yum-config-manager utility, and device-mapper-persistent-data and lvm2 are required by the devicemapper storage driver.

sudo yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2

B：Use the following command to set up the stable repository. You always need the stablerepository, even if you want to install builds from the edge or test repositories as well.

sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

C：Optional: Enable the edge and test repositories. These repositories are included in the docker.repo file above but are disabled by default. You can enable them alongside the stable repository.（这一步可以不用做）

sudo yum-config-manager --enable docker-ce-edge

sudo yum-config-manager --enable docker-ce-test

1.2.2：安装DOCKER CE

1：Install the latest version of Docker CE, or go to the next step to install a specific version:

sudo yum install docker-ce

2：start Docker

sudo systemctl start docker

3：查看Docker版本

 sudo systemctl start docker

#设置开机自启动docker

chkconfig docker on

4：验证是否安装成功（如下表示安装成功）

sudo docker run hello-world

5：查看Docker运行状态

systemctl status docker

1.2.3：运行Docker

1：下载镜像到本地

下载centos的镜像就写docker pull centos，下载ubuntu的就可以写docker pull ubuntu

docker pull centos

2：docker images

查看当前我们下载了哪些docker镜像

docker images

3：进入docker

docker run -i -t centos /bin/bash

4：退出docker

exit

5：搜索可以获取的相关镜像

docker search centos

Docker-CentOS下Docker的安装