CentOS 7.1开机运行模式run level详解
<p>在大多数的linux发行版本中，通常有8个 runlevel</p><p>Runlevel System State</p>
<p>0 Halt the system</p>
<p>1 Single user mode</p>
<p>2 Basic multi user mode</p>
<p>3 Multi user mode</p>
<p>5 Multi user mode with GUI</p>
<p>6 Reboot the system</p>
<p>S, s Single user mode</p>
<p><strong>可以在文件 /etc/inittab 中查看</strong></p>
<p># cat/etc/inittab </p>
<p>-bash: cat/etc/inittab: 没有那个文件或目录</p>
<p># cat /etc/inittab </p>
<p># inittab is no longer used when using systemd.</p>
<p>#</p>
<p># ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.</p>
<p>#</p>
<p># Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target</p>
<p>#</p>
<p># systemd uses 'targets' instead of runlevels. By default, there are two main targets:</p>
<p>#</p>
<p># multi-user.target: analogous to runlevel 3</p>
<p># graphical.target: analogous to runlevel 5</p>
<p>#</p>
<p># To view current default target, run:</p>
<p># systemctl get-default</p>
<p>#</p>
<p># To set a default target, run:</p>
<p># systemctl set-default TARGET.target</p>
<p>#</p>
<p><strong>// get-default</strong></p>
<p># systemctl get-default</p>
<p>graphical.target</p>
<p><strong>// set-default</strong></p>
<p># systemctl set-default multi-user.target</p>
<p>rm '/etc/systemd/system/default.target'</p>
<p>ln -s '/usr/lib/systemd/system/multi-user.target' '/etc/systemd/system/default.target'</p>
<p># systemctl get-default</p>
<p>multi-user.target</p>
<p># </p>
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