The command to install docker: yum -y install docker-ce reports an error:
Solution:
1. Download the relevant dependent environment about docker
yum -y install yum-utils device-mapper-persistent-data lvm2
2. Set the image source for downloading Docker
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
3. Clear cache
yum clean
4. Install the cache
yum makecache fast
5. Reinstall docker
yum -y install docker-ce
