1. 打开官网https://docs.docker.com/engine/install/centos/
    2. 安装前置依赖

    yum -y install gcc
    yum -y install gcc-c++

    1. 删除之前安装的docker

      1. sudo yum remove docker \
      2.                docker-client \
      3.                docker-client-latest \
      4.                docker-common \
      5.                docker-latest \
      6.                docker-latest-logrotate \
      7.                docker-logrotate \
      8.                docker-engine

    2. 安装docker所需要的包

      sudo yum install -y yum-utils

    3. 设置docker镜像网址

      sudo yum-config-manager \
 --add-repo \
 https://download.docker.com/linux/centos/docker-ce.repo   国外
sudo yum-config-manager \
 --add-repo \
 http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo 阿里云

    4. 更新yum软件包索引

      yum makecache fast

    5. 安装docker

      yum -y install docker-ce

    6. 安装完成后启动

      sudo systemctl start docker

    7. 查看docker版本

      docker version

    8. 安装hello word

      docker run hello-world

    9. 查看docker内的镜像

      docker images

      image.png

    10. 配置镜像加速 ```shell mkdir -p /etc/docker vim /etc/docker/daemon.json { “registry-mirrors”: [“https://0x3p2nkn.mirror.aliyuncs.com“] }

    systemctl daemon-reload systemctl restart docker

    
13. 卸载docker
```shell
sudo yum remove docker-ce docker-ce-cli containerd.io
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd