Author: xry111
Date: Sat Mar 14 00:10:05 2020
New Revision: 11781
Log:
systemd-custom: add a section discussing core dumps
Modified:
trunk/BOOK/chapter07/systemd-custom.xml
Modified: trunk/BOOK/chapter07/systemd-custom.xml
==============================================================================
--- trunk/BOOK/chapter07/systemd-custom.xml Fri Mar 13 07:45:58 2020
(r11780)
+++ trunk/BOOK/chapter07/systemd-custom.xml Sat Mar 14 00:10:05 2020
(r11781)
@@ -210,6 +210,52 @@
</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 > /etc/systemd/coredump.conf.d/maxuse.conf << 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>
<para>Beginning with systemd-230, all user processes are killed when a user
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