c8e053fbe4
What the man page said was different than what the code did. save_external_coredump() will store the core temporarily for backtrace generation, and will delete if afterwards if it is too large. So to disable processing, it's necessary to both set Storage=none/Storage=journal+JournalSizeMax=0/Storage=external+ExternalSizeMax=0 and ProcessSizeMax=0. This updates the man page to reflect the code. The man pages are extended to describe that Storage=none + ProcessSizeMax=0 is the simplest way to disable coredump processing. All the storage and processing options make this quite complicated, so let's add a copy-and-pasteable example of how to disable coredump. Doing it through coredump.conf has the advantage that we still log, and the effect is immediate, unlike masking the sysconf file. Fixes #8788.
155 lines
5.9 KiB
XML
155 lines
5.9 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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-->
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<refentry id="coredump.conf" conditional="ENABLE_COREDUMP"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>coredump.conf</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>coredump.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>coredump.conf</refname>
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<refname>coredump.conf.d</refname>
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<refpurpose>Core dump storage configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/systemd/coredump.conf</filename></para>
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<para><filename>/etc/systemd/coredump.conf.d/*.conf</filename></para>
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<para><filename>/run/systemd/coredump.conf.d/*.conf</filename></para>
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<para><filename>/usr/lib/systemd/coredump.conf.d/*.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>These files configure the behavior of
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<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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a handler for core dumps invoked by the kernel. Whether <command>systemd-coredump</command> is used
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is determined by the kernel's
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<varname>kernel.core_pattern</varname> <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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setting. See
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<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and
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<citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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pages for the details.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="main-conf" />
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<refsect1>
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<title>Options</title>
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<para>All options are configured in the
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<literal>[Coredump]</literal> section:</para>
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<variablelist>
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<varlistentry>
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<term><varname>Storage=</varname></term>
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<listitem><para>Controls where to store cores. One of <literal>none</literal>,
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<literal>external</literal>, and <literal>journal</literal>. When
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<literal>none</literal>, the core dumps may be logged (including the backtrace if
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possible), but not stored permanently. When <literal>external</literal> (the
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default), cores will be stored in <filename>/var/lib/systemd/coredump/</filename>.
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When <literal>journal</literal>, cores will be stored in the journal and rotated
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following normal journal rotation patterns.</para>
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<para>When cores are stored in the journal, they might be
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compressed following journal compression settings, see
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<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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When cores are stored externally, they will be compressed
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by default, see below.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Compress=</varname></term>
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<listitem><para>Controls compression for external
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storage. Takes a boolean argument, which defaults to
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<literal>yes</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ProcessSizeMax=</varname></term>
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<listitem><para>The maximum size in bytes of a core
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which will be processed. Core dumps exceeding this size
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may be stored, but the backtrace will not be generated.
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</para>
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<para>Setting <varname>Storage=none</varname> and <varname>ProcessSizeMax=0</varname>
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disables all coredump handling except for a log entry.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ExternalSizeMax=</varname></term>
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<term><varname>JournalSizeMax=</varname></term>
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<listitem><para>The maximum (uncompressed) size in bytes of a
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core to be saved.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MaxUse=</varname></term>
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<term><varname>KeepFree=</varname></term>
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<listitem><para>Enforce limits on the disk space taken up by
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externally stored core dumps. <option>MaxUse=</option> makes
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sure that old core dumps are removed as soon as the total disk
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space taken up by core dumps grows beyond this limit (defaults
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to 10% of the total disk size). <option>KeepFree=</option>
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controls how much disk space to keep free at least (defaults
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to 15% of the total disk size). Note that the disk space used
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by core dumps might temporarily exceed these limits while
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core dumps are processed. Note that old core dumps are also
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removed based on time via
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<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>. Set
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either value to 0 to turn off size-based
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clean-up.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The defaults for all values are listed as comments in the
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template <filename>/etc/systemd/coredump.conf</filename> file that
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is installed by default.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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