RHEL7更改默认启动级别

[[email protected] ~]# more /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

#

fmc:2345:respawn:/opt/ibm/db2/V10.5/bin/db2fmcd #DB2 Fault Monitor Coordinator

[[email protected] ~]# systemctl get-default 

graphical.target

设置默认启动为多用户字符界面：

[[email protected] ~]# 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‘

查看默认启动的运行模式：

[[email protected] ~]# systemctl get-default 

multi-user.target  字符模式

[[email protected] ~]#

设置默认启动为多用户图形界面：

[[email protected] ~]# systemctl set-default graphical.target 

rm ‘/etc/systemd/system/default.target‘

ln -s ‘/usr/lib/systemd/system/graphical.target‘ ‘/etc/systemd/system/default.target‘

[[email protected] ~]#

查看默认启动的运行模式：

[[email protected] ~]# systemctl get-default 

graphical.target  图形模式

[[email protected] ~]#

从字符界面切换到图形界面：

方法1：执行startx

方法2：执行systemctl  isolate graphical.target

总结：可以看到更改默认级别的操作即先删除当前默认配置文件，然后再创建链接文件即可。