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systemd-stable/man/coredump.conf.xml
Zbigniew Jędrzejewski-Szmek c8e053fbe4 man: fix ProcessSizeMax= description, describe how to disable coredumps
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.
2018-05-17 17:15:03 +02:00

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<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
This file is part of systemd.
Copyright 2014 Zbigniew Jędrzejewski-Szmek
-->
<refentry id="coredump.conf" conditional="ENABLE_COREDUMP"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>coredump.conf</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>coredump.conf</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>coredump.conf</refname>
<refname>coredump.conf.d</refname>
<refpurpose>Core dump storage configuration files</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/etc/systemd/coredump.conf</filename></para>
<para><filename>/etc/systemd/coredump.conf.d/*.conf</filename></para>
<para><filename>/run/systemd/coredump.conf.d/*.conf</filename></para>
<para><filename>/usr/lib/systemd/coredump.conf.d/*.conf</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>These files configure the behavior of
<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
a handler for core dumps invoked by the kernel. Whether <command>systemd-coredump</command> is used
is determined by the kernel's
<varname>kernel.core_pattern</varname> <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>
setting. See
<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>
and
<citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>
pages for the details.</para>
</refsect1>
<xi:include href="standard-conf.xml" xpointer="main-conf" />
<refsect1>
<title>Options</title>
<para>All options are configured in the
<literal>[Coredump]</literal> section:</para>
<variablelist>
<varlistentry>
<term><varname>Storage=</varname></term>
<listitem><para>Controls where to store cores. One of <literal>none</literal>,
<literal>external</literal>, and <literal>journal</literal>. When
<literal>none</literal>, the core dumps may be logged (including the backtrace if
possible), but not stored permanently. When <literal>external</literal> (the
default), cores will be stored in <filename>/var/lib/systemd/coredump/</filename>.
When <literal>journal</literal>, cores will be stored in the journal and rotated
following normal journal rotation patterns.</para>
<para>When cores are stored in the journal, they might be
compressed following journal compression settings, see
<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
When cores are stored externally, they will be compressed
by default, see below.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>Compress=</varname></term>
<listitem><para>Controls compression for external
storage. Takes a boolean argument, which defaults to
<literal>yes</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ProcessSizeMax=</varname></term>
<listitem><para>The maximum size in bytes of a core
which will be processed. Core dumps exceeding this size
may be stored, but the backtrace will not be generated.
</para>
<para>Setting <varname>Storage=none</varname> and <varname>ProcessSizeMax=0</varname>
disables all coredump handling except for a log entry.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ExternalSizeMax=</varname></term>
<term><varname>JournalSizeMax=</varname></term>
<listitem><para>The maximum (uncompressed) size in bytes of a
core to be saved.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>MaxUse=</varname></term>
<term><varname>KeepFree=</varname></term>
<listitem><para>Enforce limits on the disk space taken up by
externally stored core dumps. <option>MaxUse=</option> makes
sure that old core dumps are removed as soon as the total disk
space taken up by core dumps grows beyond this limit (defaults
to 10% of the total disk size). <option>KeepFree=</option>
controls how much disk space to keep free at least (defaults
to 15% of the total disk size). Note that the disk space used
by core dumps might temporarily exceed these limits while
core dumps are processed. Note that old core dumps are also
removed based on time via
<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>. Set
either value to 0 to turn off size-based
clean-up.</para></listitem>
</varlistentry>
</variablelist>
<para>The defaults for all values are listed as comments in the
template <filename>/etc/systemd/coredump.conf</filename> file that
is installed by default.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-tmpfiles</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>