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authorCem Keylan <cem@ckyln.com>2020-09-09 17:51:04 +0300
committerCem Keylan <cem@ckyln.com>2020-09-09 17:51:04 +0300
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<!-- Copyright (C) 2020 Cem Keylan
+
+Licensed under Gnu Free Documentation License. -->
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+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Configuring Init (Carbs Linux User Manual)</title>
+
+<meta name="description" content="Configuring Init (Carbs Linux User Manual)">
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+<link href="Init-System.html" rel="up" title="Init System">
+<link href="Changing-Init-Program.html" rel="next" title="Changing Init Program">
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+<body lang="en">
+<span id="Configuring-Init"></span><div class="header">
+<p>
+Next: <a href="Changing-Init-Program.html" accesskey="n" rel="next">Changing Init Program</a>, Up: <a href="Init-System.html" accesskey="u" rel="up">Init System</a> &nbsp; </p>
+</div>
+<hr>
+<span id="Configuring-Init-1"></span><h3 class="section">3.1 Configuring Init</h3>
+
+<p>There are three ways you can change the behaviour of the init system. Those are:
+</p>
+<ol>
+<li> Kernel Command Line
+</li><li> <samp>/etc/init/rc.conf</samp> file
+</li><li> Init Hooks
+</li></ol>
+
+<span id="Kernel-Command-Line"></span><h4 class="subsection">3.1.1 Kernel Command Line</h4>
+
+<p>On GRUB, you can edit the kernel command line parameters, which will be parsed
+as variables on the init system. Not all of the parameters will be acted upon,
+but all of them will be set as variables on the init script. For example an
+example command line, and how it is interpreted.
+</p>
+<div class="example">
+<pre class="example">BOOT_IMAGE=/boot/vmlinuz root=/dev/sda2 rw loglevel=3 quiet
+</pre></div>
+
+<p>This command line will be parsed to set the following variables:
+</p>
+<div class="example">
+<pre class="example">BOOT_IMAGE=/boot/vmlinuz
+root=/dev/sda2
+rw=1
+loglevel=3
+quiet=1
+</pre></div>
+
+<p>Some of these variables, such as <code>rw</code>/<code>ro</code>, <code>loglevel</code>, and
+<code>quiet</code>, will be used by the init system to change the behaviour of the
+startup.
+</p>
+<span id="g_t_002fetc_002finit_002frc_002econf-file"></span><h4 class="subsection">3.1.2 <samp>/etc/init/rc.conf</samp> file</h4>
+
+<p>However, the kernel command line isn&rsquo;t the only place to set your boot
+parameters. You can specify variables here as well, although note that the
+kernel command line always gets the priority for these variables since they can
+be set just before boot.
+</p>
+<span id="Init-Hooks"></span><h4 class="subsection">3.1.3 Init Hooks</h4>
+
+<p>Init hooks are for custom personal commands that the user may want to add to
+alter their boot. These can be used to load kernel modules, modify interfaces,
+and lot more. Those hooks are added to the <samp>/etc/init</samp> directory with the
+hook name as the suffix. For example, a boot script will be placed as
+<samp>/etc/init/my-hook.boot</samp>. Currently, there are 4 hooks that the user can use.
+</p>
+<dl compact="compact">
+<dt><samp>early-boot</samp></dt>
+<dd><p>Run after pseudo-filesystems are mounted.
+</p></dd>
+<dt><samp>boot</samp></dt>
+<dd><p>Run before the boot stage is completed.
+</p></dd>
+<dt><samp>pre.shutdown</samp></dt>
+<dd><p>Run first when shutting down.
+</p></dd>
+<dt><samp>post.shutdown</samp></dt>
+<dd><p>Run just before the system is halted.
+</p></dd>
+</dl>
+
+<hr>
+<div class="header">
+<p>
+Next: <a href="Changing-Init-Program.html" accesskey="n" rel="next">Changing Init Program</a>, Up: <a href="Init-System.html" accesskey="u" rel="up">Init System</a> &nbsp; </p>
+</div>
+
+
+
+</body>
+</html>