centos7换源 ：换阿里源 docker-ce配置阿里云镜像源

# base
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

# docker-ce
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo

yum clean all

yum makecache

yum install docker-ce