man/systemd-debug-generator.html

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  22   <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</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
  23     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="idm140445918695936"></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 a generator
  24     that reads the kernel command line and understands three
  25     options:</p><p>If the <code class="option">systemd.mask=</code> option is specified
  26     and followed by a unit name, this unit is masked for the runtime,
  27     similar to the effect of
  28     <a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>'s
  29     <span class="command"><strong>mask</strong></span> command. This is useful to boot with
  30     certain units removed from the initial boot transaction for
  31     debugging system startup. May be specified more than once.</p><p>If the <code class="option">systemd.wants=</code> option is specified
  32     and followed by a unit name, a start job for this unit is added to
  33     the initial transaction. This is useful to start one or more
  34     additional units at boot. May be specified more than once.</p><p>If the <code class="option">systemd.debug-shell</code> option is
  35     specified, the debug shell service
  36     "<code class="literal">debug-shell.service</code>" is pulled into the boot
  37     transaction. It will spawn a debug shell on tty9 during early
  38     system startup. Note that the shell may also be turned on
  39     persistently by enabling it with
  40     <a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>'s
  41     <span class="command"><strong>enable</strong></span> command.</p><p><code class="filename">systemd-debug-generator</code> implements the
  42     <a class="ulink" href="http://www.freedesktop.org/wiki/Software/systemd/Generators" target="_top">generator
  43     specification</a>.</p></div><div class="refsect1"><a name="idm140445918936208"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
  44       <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
  45       <a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>,
  46       <a href="kernel-command-line.html"><span class="citerefentry"><span class="refentrytitle">kernel-command-line</span>(7)</span></a>
  47     </p></div></div></body></html>