添加内容到

vi  /etc/rc.d/rc.local

在centos7中，/etc/rc.d/rc.local的权限被降低了，所以需要执行如下命令赋予其可执行权限 

chmod +x /etc/rc.d/rc.local

启动服务

systemctl status   rc-local.service
systemctl start    rc-local.service
systemctl enable   rc-local.service
systemctl status   rc-local.service