centos7docker安装

清除之前安装

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

添加国内docker镜像

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

启动

systemctl start docker

更换国内镜像

# 修改/etc/docker/daemon.json
{ 
       "registry-mirrors":
           [
              "https://docker.mirrors.ustc.edu.cn",
              "https://registry.docker-cn.com",
              "http://hub-mirror.c.163.com"
           ] 
}