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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-debug-generator</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="systemd.directives.html">Directives </a>·
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<a href="../python-systemd/index.html">Python </a>·
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<a href="../libudev/index.html">libudev </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 217</span><hr><div class="refentry"><a name="systemd-debug-generator"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-debug-generator — Generator for enabling a runtime debug shell and masking specific units at boot</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">/usr/lib/systemd/system-generators/systemd-debug-generator</code></p></div><div class="refsect1"><a name="idm214191671520"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-debug-generator</code> is
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a generator that reads the kernel command line and
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understands three options:</p><p>If the <code class="option">systemd.mask=</code> option is
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specified and followed by a unit name, this unit is
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masked for the runtime, similar to the effect of
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<a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>'s
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<span class="command"><strong>mask</strong></span> command. This is useful to
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boot with certain units removed from the initial boot
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transaction for debugging system startup. May be
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specified more than once.</p><p>If the <code class="option">systemd.wants=</code> option is
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specified and followed by a unit name, a start job for
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this unit is added to the initial transaction. This is
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useful to start one or more additional units at
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boot. May be specified more than once.</p><p>If the <code class="option">systemd.debug-shell</code>
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option is specified, the debug shell service
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"<code class="literal">debug-shell.service</code>" is pulled into
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the boot transaction. It will spawn a debug shell on
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tty9 during early system startup. Note that the shell
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may also be turned on persistently by enabling it with
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<a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>'s
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<span class="command"><strong>enable</strong></span> command.</p><p><code class="filename">systemd-debug-generator</code>
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implements the <a class="ulink" href="http://www.freedesktop.org/wiki/Software/systemd/Generators" target="_top">generator
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specification</a>.</p></div><div class="refsect1"><a name="idm214191542208"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
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<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
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<a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>,
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<a href="kernel-command-line.html"><span class="citerefentry"><span class="refentrytitle">kernel-command-line</span>(7)</span></a>
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</p></div></div></body></html>
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