centos7 Linux图形界面安装 默认启动级别

rui

centos7不能像centos6那样直接修改/etc/inittab文件来达到目的；
centos仍然只有两种启动模式：

multi-user.target: analogous to runlevel 3  #命令行模式

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graphical.target: analogous to runlevel 5   #图形模式

[img]file:///C:/Users/Victor/AppData/Roaming/Tencent/Users/1320503165/QQ/WinTemp/RichOle/TPFTNY07I$[JCF%7DNKUYDLNQ.png[/img]
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* w: h& W( K4 W/ n! s9 \+ a4 [[img]file:///C:/Users/Victor/AppData/Roaming/Tencent/Users/1320503165/QQ/WinTemp/RichOle/TPFTNY07I$[JCF%7DNKUYDLNQ.png[/img]

                               
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通过systemctl get-default 命令获取当前模式：

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由上面结果可知，当前为命令行模式

通过systemctl set-default graphical.target 命令，修改启动模式

前提是：你安装了图形界面

admin

centos图形界面安装
yum groupinstall -y "X Window System"
yum groupinstall -y "Desktop"

admin

yum -y groupinstall "Server with GUI"   安装gui图形组件

admin

[root@localhost Desktop]# systemctl get-default          \\查看默认运行级别 multi-user.target [root@localhost Desktop]
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  D$ {( M, l& j8 v. y# cat /etc/inittab # inittab is no longer used when using systemd. #
; T* ]% j9 r0 C5 r7 Y9 a # ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. #
5 ^: @$ ~7 L' V2 B( @# Ctrl-Alt-Delete is handled by /etc/systemd/system/ctrl-alt-del.target #
7 l' l' i# y4 ~2 \2 o$ x7 O- l# systemd uses 'targets' instead of runlevels. By default, there are two main targets: #
# multi-user.target: analogous to runlevel 3                \\运行级别3：多用户界面
# graphical.target: analogous to runlevel 5                  \\运行级别5：图形化界面 #
4 `+ Z2 z( _# d8 W) j# To set a default target, run: #
* d  k$ M. F- ^( O1 i9 E2 Q/ j # ln -sf /lib/systemd/system/.target   /etc/systemd/system/default.target
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# [root@localhost Desktop]
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1 I' B4 C/ X  |3 B7 M7 B# systemctl set-default graphical.target \\设置默认图形化运行级别
rm '/etc/systemd/system/default.target' 、
' l4 y6 J4 N. f9 O, O( N" t( gln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'

[root@localhost Desktop]# systemctl get-default                    \\查看默认运行级别 graphical.target                                                    \\图形化设置OK [root@localhost Desktop]#

admin

[root@localhost Desktop]# systemctl get-default          \\查看默认运行级别 multi-user.target

5 N! n6 a% g! N3 w  \. f4 T5 o# w5 \ [root@localhost Desktop]# cat /etc/inittab
# inittab is no longer used when using systemd.
) i' M/ d2 i) ^3 k# # ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
1 A( m) _4 L9 I+ V0 [, c7 U# # 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:
% Y- v( R0 U+ c# @, y& {& S# # multi-user.target: analogous to runlevel 3                \\运行级别3：多用户界面
# graphical.target: analogous to runlevel 5                  \\运行级别5：图形化界面
5 q" E$ n8 S( S9 N1 j3 |0 O# # To set a default target, run: #
# ln -sf /lib/systemd/system/.target   /etc/systemd/system/default.target #
6 _7 G' J6 }% n. k [root@localhost Desktop]# systemctl set-default graphical.target \\设置默认图形化运行级别 rm '/etc/systemd/system/default.target'
! b3 [9 F2 W# A3 s' t; oln -s '/usr/lib/systemd/system/graphical.target' '/etc/systemd/system/default.target'
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[root@localhost Desktop]# systemctl get-default                    \\查看默认运行级别 graphical.target                                                    \\图形化设置OK [root@localhost Desktop]#

admin

由上面结果可知，当前为命令行模式 通过systemctl set-default graphical.target 命令，修改启动模式

admin

由上面结果可知，当前为命令行模式 通过systemctl set-default multi-user.target 命令，修改启动模式为文本模式

admin

# systemctl get-default      获取当前系统默认启动方式：
# d3 ?1 S1 q& E. x' ?8 q+ M+ @, ^multi-user.target
) E4 O8 `: ~  j- m6 a#systemctl set-default multi-user.target  #命令，修改启动模式为文本模式

admin

yum -y groupinstall "GNOME Desktop"