查看当前系统的运行级别 [root@apenglinux ~]# runlevel 3 5 查看系统的默认级别 [root@apenglinux ~]# systemctl get-default graphical.target
设置系统的默认运行级别为3 [root@apenglinux ~]# systemctl set-default multi-user.target
[root@apenglinux ~]# rm -f /etc/systemd/system/default.target [root@apenglinux ~]# ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
设置系统的默认运行级别为5 [root@apenglinux ~]# systemctl set-default graphical.target [root@apenglinux ~]# rm -f /etc/systemd/system/default.target [root@apenglinux ~]# ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
从3级别切换到5级别 init 5 systemctl isolate graphical.target
从5级别切换到3级别 init 3 systemctl isolate multi-user.target
查看系统的运行级别 [root@apenglinux ~]# ls -l /lib/systemd/system/runlevel*target lrwxrwxrwx. 1 root root 15 1月 18 17:03 /lib/systemd/system/runlevel0.target -> poweroff.target lrwxrwxrwx. 1 root root 13 1月 18 17:03 /lib/systemd/system/runlevel1.target -> rescue.target lrwxrwxrwx. 1 root root 17 1月 18 17:03 /lib/systemd/system/runlevel2.target -> multi-user.target lrwxrwxrwx. 1 root root 17 1月 18 17:03 /lib/systemd/system/runlevel3.target -> multi-user.target lrwxrwxrwx. 1 root root 17 1月 18 17:03 /lib/systemd/system/runlevel4.target -> multi-user.target lrwxrwxrwx. 1 root root 16 1月 18 17:03 /lib/systemd/system/runlevel5.target -> graphical.target lrwxrwxrwx. 1 root root 13 1月 18 17:03 /lib/systemd/system/runlevel6.target -> reboot.target
