CentOS 7 运行级别切换

CentOS 7 版本不再使用该文件定义系统运行级别,相关运行级别设置无效:

[sywu@c1-11r2-rac1etc]$cat/etc/centos-releaseCentOSLinuxrelease7.0.1406(Core)
[sywu@c1-11r2-rac1etc]$cat/etc/inittab
#inittabisnolongerusedwhenusingsystemd.
#
#ADDINGCONfigURATIONHEREWILLHAVENOEFFECTONYOURSYstem.
#
#Ctrl-Alt-Deleteishandledby/etc/systemd/system/ctrl-alt-del.target
#
#systemduses'targets'insteadofrunlevels.Bydefault,therearetwomaintargets:
#
#multi-user.target:analogoustorunlevel3#graphical.target:analogoustorunlevel5#
#Tosetadefaulttarget,run:
#
#ln-sf/lib/systemd/system/<targetname>.target/etc/systemd/system/default.target
#id:3:initdefault:#无效[sywu@c1-11r2-rac1etc]$

新版本的运行级别都定义在/lib/systemd/system下:

[sywu@c1-11r2-rac1system]$ls-ltr/lib/systemd/system/runlevel*lrwxrwxrwx.1rootroot137月3014:22/lib/systemd/system/runlevel1.target->rescue.target
lrwxrwxrwx.1rootroot157月3014:22/lib/systemd/system/runlevel0.target->poweroff.target
lrwxrwxrwx.1rootroot177月3014:22/lib/systemd/system/runlevel2.target->multi-user.target
lrwxrwxrwx.1rootroot177月3014:22/lib/systemd/system/runlevel3.target->multi-user.target
lrwxrwxrwx.1rootroot177月3014:22/lib/systemd/system/runlevel4.target->multi-user.target
lrwxrwxrwx.1rootroot167月3014:22/lib/systemd/system/runlevel5.target->graphical.target
lrwxrwxrwx.1rootroot137月3014:22/lib/systemd/system/runlevel6.target->reboot.target

可以针对不同需要设置不同的运行级别:

如设置命令行级别方法:

ln-sfsystemdrunlevel3.targetsystemd.target
或
lnsfsystemdlti.targetsystemd.target
或
systemctlset-defaultmulti-user.target

设置窗口级别方法:

lnsfsystemdrunlevel5.targetsystemdsfsystemdraphical.targetsystemd.target
或
systemctlset-defaultgraphical.target