<?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"> <!-- This file is part of systemd. Copyright 2014 Zbigniew Jędrzejewski-Szmek 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-coredump" conditional='ENABLE_COREDUMP' xmlns:xi="http://www.w3.org/2001/XInclude"> <refentryinfo> <title>systemd-coredump</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-coredump</refentrytitle> <manvolnum>8</manvolnum> </refmeta> <refnamediv> <refname>systemd-coredump</refname> <refpurpose>Log and store core dumps</refpurpose> </refnamediv> <refsynopsisdiv> <para><filename>/usr/lib/systemd/systemd-coredump</filename></para> </refsynopsisdiv> <refsect1> <title>Description</title> <para><command>systemd-coredump</command> can be used as a helper binary by the kernel when a user space program receives a fatal signal and dumps core. For it to be used in this capacity, it must be specified by the <varname>kernel.core_pattern</varname> <citerefentry project='man-pages'><refentrytitle>sysctl</refentrytitle><manvolnum>8</manvolnum></citerefentry> setting. Systemd installs <filename>/usr/lib/sysctl.d/50-coredump.conf</filename> which configures <varname>kernel.core_pattern</varname> to invoke <command>systemd-coredump</command>. This file may be masked or overridden to use a different setting following normal <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> rules.</para> <para>The behavior of a specific program upon reception of a signal is governed by a few factors which are described in detail in <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>. In particular, the coredump will only be processed when the related resource limits are high enough. For programs started by <command>systemd</command>, those may be set using <varname>LimitCore=</varname> (see <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). </para> <para><command>systemd-coredump</command> will log the coredump including a backtrace if possible, and store the core (contents of process' memory contents) in an external file on disk in <filename>/var/lib/systemd/coredump</filename>, or directly in the journal. This behavior may be modified using <citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> <para>Apart from the <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> log viewer, <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> may be used to list and extract coredumps.</para> </refsect1> <refsect1> <title>See Also</title> <para> <citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. </para> </refsect1> </refentry>