Redhat 7修改默認運行級別方法

論斷一：

今天裝了下正式版的RHEL7，發現熟悉的inittab中沒有了修改默認運行級別，打開inittab以下

[root@localhost init.d]# vi /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

中間沒有了熟悉的 id:5:initdefault

 

RHEL7 使用systemd建立符號連接指向默認運行級別。

 

修改方法爲：
1.首先刪除已經存在的符號連接
----------------------------------------------------------------------------------
rm /etc/systemd/system/default.target
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2.默認級別轉換爲3(文本模式)
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ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
----------------------------------------------------------------------------------
或者默認級別轉換爲5(圖形模式)
----------------------------------------------------------------------------------
ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target
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3.重啓
----------------------------------------------------------------------------------
reboot
-----------------------------------------------------------------------------

論斷二：

Red Hat Enterprise Linux Server release 7.0 (Maipo) 修改啓動級別
以前的配置文件在/etc/inittab 這裏
vim /etc/inittab 咱們服務器用，習慣把id:5改爲3，字符界面啓動，或者最小化安裝。
rhel7.0 作了不少大的改變，打開inittab看下
# inittab is no longer used when using systemd.      /etc/inittab 這個文件已經再也不使用 
# 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      相似於運行級別3
# graphical.target: analogous to runlevel 5       相似於運行級別5
#
# To set a default target, run:               #運行下面 命令設置默認開機啓動級別
#
# ln -sf /lib/systemd/system/<target name>.target /etc/systemd/system/default.target

 /lib/systemd/system/   裏面有0-6 六個級別的文件軟鏈接
runlevel0.target         poweroff
runlevel1.target         rescue
runlevel2.target         multi-user
runlevel3.target         multi-user
runlevel4.target         multi-user
runlevel5.target         graphical
runlevel6.target         reboot
例如：修改5級別： ln -sf /lib/systemd/system/runlevel5.target   /etc/systemd/system/default.target
例如：修改3級別： ln -sf /lib/systemd/system/runlevel3.target   /etc/systemd/system/default.target