CentOS7 Runlevel 변경하기

CentOS7 (Redhat 7) 버전부터 시스템 Run Level을 변경하는 방법이 바뀌었다.

 

기존 CentOS6 버전까지는 아래와 같이 /etc/inittab 파일이하 id 값만 변경하면 시스템 Runlevel이 변경되었다.

 

[root@CentOS6 ~]# [root@CentOS6 ~]# cat /etc/inittab # # inittab       This file describes how the INIT process should set up #               the system in a certain run-level. # # Author:       Miquel van Smoorenburg, <miquels@drinkel.nl.mugnet.org> #               Modified for RHS Linux by Marc Ewing and Donnie Barnes # # Default runlevel. The runlevels used by RHS are: #   0 - halt (Do NOT set initdefault to this) #   1 - Single user mode #   2 - Multiuser, without NFS (The same as 3, if you do not have networking) #   3 - Full multiuser mode #   4 - unused #   5 - X11 #   6 - reboot (Do NOT set initdefault to this) # id:3:initdefault: # System initialization. si::sysinit:/etc/rc.d/rc.sysinit l0:0:wait:/etc/rc.d/rc 0 l1:1:wait:/etc/rc.d/rc 1 l2:2:wait:/etc/rc.d/rc 2 l3:3:wait:/etc/rc.d/rc 3 l4:4:wait:/etc/rc.d/rc 4 l5:5:wait:/etc/rc.d/rc 5 l6:6:wait:/etc/rc.d/rc 6 # Trap CTRL-ALT-DELETE ca::ctrlaltdel:/sbin/shutdown -t3 -r now   ... 중략

 

 

하지만 CentOS7 버전 부터는 systemctl 명령을 통해 Runlevel을 변경하도록 안내해 주고 있다.

 

[root@localhost ~]# [root@localhost ~]# 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 /etc/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 set a default target, run: # # ln -sf /lib/systemd/system/<target name>.target /etc/systemd/system/default.target # [root@localhost ~]#

 

 

1. 현재 시스템 Run Level 확인하기

 

[root@localhost ~]# [root@localhost ~]# systemctl get-default graphical.target [root@localhost ~]#

 

 

2. System booting 시 Level을 Runlevel 3로 변경하기

 

[root@localhost ~]# [root@localhost ~]# 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@localhost ~]# [root@localhost ~]#

 

 

3. 현재 Level을 바로 변경 하기 (init 3)

 

[root@localhost ~]# [root@localhost ~]# systemctl isolate multi-user.target [root@localhost ~]#