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systemd-custom: add a section discussing core dumps

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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11781 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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Xi Ruoyao 2020-03-14 07:10:05 +00:00
parent 6fb10045a9
commit 4d796cab3e
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chapter07/systemd-custom.xml
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@ -209,6 +209,52 @@ EOF</userinput></screen>
</sect2>
<sect2>
<title>Working with Core Dumps</title>
<para>Core dumps are useful to debug crashed programs, especially
when a daemon process crashes. On systemd booted systems the core
dumping is handled by <command>systemd-coredump</command>. It will
log the core dump into the journal and store the core dump itself in
<filename class="directory">/var/lib/systemd/coredump</filename>.
To retrieve and process core dumps, <command>coredumpctl</command>
tool is provided. Here are some examples of frequently used commands:
</para>
<itemizedlist>
<listitem>
<para><command>coredumpctl -r</command>: lists all core dumps in
reversed chronological order.</para>
</listitem>
<listitem>
<para><command>coredumpctl -1 info</command>: show the information
of the last core dump.</para>
</listitem>
<listitem>
<para><command>coredumpctl -1 debug</command>: load the last core
dump into <ulink url="&blfs-book;general/gdb.html">GDB</ulink>.
</para>
</listitem>
</itemizedlist>
<para>Core dumps may use a lot of disk space. The maximum disk space
used by core dumps can be limited by creating a configuration file in
<filename class="directory">/etc/systemd/coredump.conf.d</filename>.
For example:</para>
<screen role="nodump"><userinput>mkdir -pv /etc/systemd/coredump.conf.d
cat &gt; /etc/systemd/coredump.conf.d/maxuse.conf &lt;&lt; EOF
<literal>[Coredump]
MaxUse=5G</literal>
EOF</userinput></screen>
<para>See <filename>systemd-coredump(8)</filename>,
<filename>coredumpctl(1)</filename>, and
<filename>coredump.conf.d(5)</filename> manual pages for more
information.</para>
</sect2>
<sect2>
<title>Long Running Processes</title>