删除已安装的Docker

# Uninstall installed docker

sudo yum remove docker \

                  docker-client \

                  docker-client-latest \

                  docker-common \

                  docker-latest \

                  docker-latest-logrotate \

                  docker-logrotate \

                  docker-selinux \

                  docker-engine-selinux \

                  docker-engine

配置阿里云Docker Yum源

# Set up repository

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

# Use Aliyun Docker

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

安装 Docker CE

更新 yum 软件源缓存，并安装 docker-ce。

sudo yum makecache fast

sudo yum install docker-ce

启动Docker服务

# Start docker service

systemctl enable docker

systemctl start docker