前提：Linux环境已经搭建好，安装了VMware和MobarXterm

1.卸载旧版

首先如果系统中已经存在旧的Docker，则先卸载：

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

2.配置Docker的yum库

首先要安装一个yum工具：

yum install -y yum-utils

如果出现下述报错：

原因：服务器没法访问外面的网络，所以需要配置镜像源

2.1：解决方案

先进入目录 /etc/yum.repos.d

cd /etc/yum.repos.d

编辑替换：

vi /etc/yum.repos.d/CentOS-Base.repo

替换内容为：

[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

清理 yum 缓存：

yum clean all

再次输入命令：

yum install -y yum-utils

成功解决！！！

安装成功后，执行命令，配置Docker的yum源：

sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

3.安装Docker

最后，执行命令，安装Docker

yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

4.启动和校验

# 启动Docker
systemctl start docker

# 停止Docker
systemctl stop docker

# 重启
systemctl restart docker

# 设置开机自启
systemctl enable docker

# 执行docker ps命令，如果不报错，说明安装启动成功
docker ps