1、安装docker

先配置一下docker安装源

curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

安装ocker

yum -y install docker-ce

package docker-ce-3:19.03.5-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed

2、解决问题

检查发现containerd.io此软件包已经安装，但版本是1.2.0；所以造成这种安装失败的原因是containerd.io软件包版本过低

安装 containerd.io

dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm

3、更新yum镜像为阿里云镜像，下载docker安装文件速度更快

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

4、开始安装docker

yum install docker-ce docker-ce-cli -y

5、启动docker

sudo systemctl start docker

docker --version

6、设置开机启动

sudo systemctl enable docker