清理旧的Docker

yum remove docker docker-client  docker-client-latest  docker-common  docker-latest  docker-latest-logrotate  docker-logrotate  docker-selinux  docker-engine-selinux  docker-engine -y

安装依赖
yum install -y yum-utils device-mapper-persistent-data lvm2

配置阿里云Docker源
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

查看源中的版本
yum list docker-ce.x86_64 --showduplicates | sort -r

安装Docker

yum -y install docker-ce-19.03.5-3.el7

设置开机启动并启动服务

systemctl enable docker
systemctl start docker

镜像加速，修改源，并修改docker的驱动方式

vi /etc/docker/daemon.json
{
  "registry-mirrors": ["https://i7sdzehw.mirror.aliyuncs.com"]
}
sudo systemctl daemon-reload
sudo systemctl restart docker

如果要更改docker的数据目录
/etc/docker/daemon.json增加如下内容"graph": "/docker/data/path",

测试拉取和运行

docker pull library/hello-world
docker run hello-world