1.linux-centos7.2 docker 安装
1.yum install docker
2.systemctl start docker // 运行 docker daemon ( Daemon 是 Docker 的守护进程)
3.docker version
#docker 开机自启动
systemctl enable docker
# 重启 docker 服务
systemctl restart docker
# 查看 docker 服务状态
systemctl status docker
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