linux服务器优化之系统服务优化

runlevel查看系统默认运行级别
/etc/inittab centos7查看修改系统运行级别systemctl get-default
centos7查看当前系统开机自启动服务
systemctl list-unit-files|grep enable
https://blog.51cto.com/youzao/797996
https://blog.csdn.net/weilin_8612/article/details/102958318