<?xml version="1.0"?> <!--*-nxml-*--> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!-- This file is part of systemd. Copyright 2014 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. --> <refentry id="systemd-debug-generator"> <refentryinfo> <title>systemd-debug-generator</title> <productname>systemd</productname> <authorgroup> <author> <contrib>Developer</contrib> <firstname>Lennart</firstname> <surname>Poettering</surname> <email>lennart@poettering.net</email> </author> </authorgroup> </refentryinfo> <refmeta> <refentrytitle>systemd-debug-generator</refentrytitle> <manvolnum>8</manvolnum> </refmeta> <refnamediv> <refname>systemd-debug-generator</refname> <refpurpose>Generator for enabling a runtime debug shell and masking specific units at boot</refpurpose> </refnamediv> <refsynopsisdiv> <para><filename>/usr/lib/systemd/system-generators/systemd-debug-generator</filename></para> </refsynopsisdiv> <refsect1> <title>Description</title> <para><filename>systemd-debug-generator</filename> is a generator that reads the kernel command line and understands three options:</para> <para>If the <option>systemd.mask=</option> option is specified and followed by a unit name, this unit is masked for the runtime, similar to the effect of <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s <command>mask</command> command. This is useful to boot with certain units removed from the initial boot transaction for debugging system startup. May be specified more than once.</para> <para>If the <option>systemd.wants=</option> option is specified and followed by a unit name, a start job for this unit is added to the initial transaction. This is useful to start one or more additional units at boot. May be specified more than once.</para> <para>If the <option>systemd.debug-shell</option> option is specified, the debug shell service <literal>debug-shell.service</literal> is pulled into the boot transaction. It will spawn a debug shell on tty9 during early system startup. Note that the shell may also be turned on persistently by enabling it with <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s <command>enable</command> command.</para> <para><filename>systemd-debug-generator</filename> implements the <ulink url="http://www.freedesktop.org/wiki/Software/systemd/Generators">generator specification</ulink>.</para> </refsect1> <refsect1> <title>See Also</title> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry> </para> </refsect1> </refentry>