查看所有启动项
sudo systemctl list-unit-files
使用grep过滤一下开启的grep enabled
sudo systemctl list-unit-files | grep enabled
查看.service文件的路径，及内容
sudo systemctl status openresty.service
禁用开机启动：
sudo systemctl disable mongodb.service
sudo systemctl disable nginx.service
sudo systemctl disable redis-server.service
停止已经开启的服务：
sudo systemctl stop mongodb.service
sudo systemctl stop nginx.service
sudo systemctl stop redis-server.service
