在大多數的linux發行版本中，通常有8個 runlevel
Runlevel System State
0 Halt the system
1 Single user mode
2 Basic multi user mode
##3 Multi user mode
5 Multi user mode with GUI
#6 Reboot the system
S, s Single user mode
可以在檔案 /etc/inittab 中查看
[root@wode003 ~]# cat/etc/inittab
-bash: cat/etc/inittab: 沒有那個檔案或目錄
[root@wode003 ~]# cat /etc/inittab
# inittab is no longer used when using systemd.
## ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
## Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target
## systemd uses 'targets' instead of runlevels. By default, there are two main targets:
## multi-user.target: analogous to runlevel 3
# graphical.target: analogous to runlevel 5
## To view current default target, run:
# systemctl get-default
## To set a default target, run:
# systemctl set-default TARGET.target
// get-default
[root@wode003 ~]# systemctl get-default
graphical.target
// set-default
[root@wode003 ~]# systemctl set-default multi-user.target
rm '/etc/systemd/system/default.target'
ln -s '/usr/lib/systemd/system/multi-user.target' '/etc/systemd/system/default.target'
[root@wode003 ~]# systemctl get-default
multi-user.target#### ###[root@wode003 ~]# ###
以上是深入解析CentOS 7.1的運作等級與開機模式的詳細內容。更多資訊請關注PHP中文網其他相關文章！
