systemctl

systemctl

启动：service NAME start ==> systemctl start NAME.service/NAME
停止：service NAME stop ==> systemctl stop NAME.service/NAME
重启：service NAME restart ==> systemctl restart NAME.service/NAME
状态：service NAME status ==> systemctl status NAME.service/NAME
条件式重启：service NAME condrestart ==> systemctl try-restart NAME.service/NAME
重载或重启服务：systemctl reload-or-restart NAME.service
重载或条件式重启服务：systemctl reload-or-try-restart NAME.service

查看某服务当前激活与否的状态：systemctl is-active NAME.service
查看所有已激活的服务：systemctl list-units --type service
查看所有服务（已激活及未激活）:chkconfig --isit ==>systemctl list-units -t service -all

设置服务开机自启：chkconfig NAME on ==> systemctl enable NAME.service
禁止服务开机自启：chkconfig NAME off ==> systemctl disable NAME.service
查看某服务是否能开机自启：chkconfig --list NAME ==> systemctl is-enabled NAME.service

禁止某服务设定为开机自启：systemctl mask NAME.service
取消此禁止：systemctl unmask NAME.service

查看某服务的依赖关系 list-dependencies NAME.service (CentOS7 支持此命令)

管理target units：
运行级别：
0 ==> runlevel0.target,poweroff.target
1 ==> runlevel1.target,rescue.target （救援模式）
2 ==> runlevel2.target,multi-user.target
3 ==> runlevel3.target,multi-user.target
4 ==> runlevel3.target,multi-user.target
5 ==> runlevel5.target,graphlcal.target
6 ==> runlevel6.target,reboot.target

级别切换:init N ==> systemctl isolate NAME.target

查看级别：runlevel ==> systemctl list-units --type target
查看所有级别：systemctl list-units -t target -a

获取默认运行级别：systemctl get0default
修改默认运行级别：systemctl set-default NAME.target

切换至紧急救援模式：systemctl rescue
切换至emergency模式：systemctl emergency

其他常用命令：
关机：systemctl halt,systemctl poweroff
重启：systemctl reboot
挂起：systemctl suspend
快照：systemctl hibernate
快照并挂起：systemctl hybrid-sleep