docker使用阿里云镜像加速

$ sudo yum remove docker
docker-client
docker-client-latest
docker-common
docker-latest
docker-latest-logrotate
docker-logrotate
docker-engine

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

官方仓库：$ sudo yum-config-manager
–add-repo
https://download.docker.com/linux/centos/docker-ce.repo

阿里云仓库：
$ sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

$ sudo yum install docker-ce docker-ce-cli containerd.io

$ sudo systemctl start docker

设置为开机自启动：
$ sudo systemctl enable docker