Zbigniew Jędrzejewski-Szmek
9 years ago
6 changed files with 115 additions and 2 deletions
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<?xml version='1.0'?> <!--*-nxml-*--> |
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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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This file is part of systemd. |
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Copyright 2014 Zbigniew Jędrzejewski-Szmek |
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systemd is free software; you can redistribute it and/or modify it |
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under the terms of the GNU Lesser General Public License as published by |
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the Free Software Foundation; either version 2.1 of the License, or |
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(at your option) any later version. |
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systemd is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public License |
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along with systemd; If not, see <http://www.gnu.org/licenses/>. |
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--> |
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<refentry id="systemd-coredump" 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>systemd-coredump</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>systemd-coredump</refentrytitle> |
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<manvolnum>8</manvolnum> |
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</refmeta> |
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<refnamediv> |
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<refname>systemd-coredump</refname> |
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<refpurpose>Log and store core dumps</refpurpose> |
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</refnamediv> |
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<refsynopsisdiv> |
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<para><filename>/usr/lib/systemd/systemd-coredump</filename></para> |
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</refsynopsisdiv> |
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<refsect1> |
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<title>Description</title> |
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<para><command>systemd-coredump</command> can be used as a helper |
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binary by the kernel when a user space program receives a fatal |
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signal and dumps core. For it to be used in this capacity, it must |
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be specified by the |
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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. Systemd installs |
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<filename>/usr/lib/sysctl.d/50-coredump.conf</filename> which |
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configures <varname>kernel.core_pattern</varname> to invoke |
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<command>systemd-coredump</command>. This file may be masked or |
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overriden to use a different setting following normal |
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<citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> rules.</para> |
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|
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<para>The behaviour of a specific program upon reception of a |
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signal is governed by a few factors which are described in detail |
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in <citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>. |
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In particular, the coredump will only be processed when the |
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related resource limits are high enough. For programs started by |
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<command>systemd</command> those may be set using |
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<varname>LimitCore=</varname> (see |
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). |
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</para> |
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|
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<para><command>systemd-coredump</command> will log the coredump |
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including a backtrace if possible, and store the core (contents of |
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process' memory contents) in an external file on disk in |
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<filename>/var/lib/systemd/coredump</filename>, or directly in |
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the journal. This behaviour may be modified using |
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<citerefentry><refentrytitle>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para> |
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|
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<para>Apart from the |
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
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log viewer, |
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<citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
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may be used to list and extract coredumps.</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>coredump.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
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<citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
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<citerefentry project='man-pages'><refentrytitle>core</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
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<citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
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<citerefentry><refentrytitle>systemd-sysctl.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. |
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</para> |
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</refsect1> |
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</refentry> |
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