Jh journactl

DC-SLES-journalctl

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+# This file originates from the project https://github.com/openSUSE/doc-kit
+# This file can be edited downstream.
+
+## Basics
+MAIN="journalctl.asm.xml"
+SRC_DIR="articles"
+IMG_SRC_DIR="images"
+
+## Profiling
+PROFOS="sles"
+PROFCONDITION="16.0"
+#PROFARCH="x86_64;zseries;power;aarch64"
+
+DOCBOOK5_RNG_URI="urn:x-suse:rng:v2:geekodoc-flat"
+
+## stylesheet location
+STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2022-ns"
+FALLBACK_STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2021-ns"

articles/journalctl.asm.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?xml-model href="https://cdn.docbook.org/schema/5.2/rng/assemblyxi.rnc"
+type="application/relax-ng-compact-syntax"?>
+<!DOCTYPE assembly
+[
+<!ENTITY % entities SYSTEM "../common/generic-entities.ent">
+%entities;
+]>
+<!-- refers to https://github.com/SUSE/doc-sle/blob/main/xml/systemd.xml -->
+<assembly version="5.2" xml:lang="en"
+xmlns:xlink="http://www.w3.org/1999/xlink"
+xmlns:trans="http://docbook.org/ns/transclusion"
+xmlns:its="http://www.w3.org/2005/11/its"
+xmlns="http://docbook.org/ns/docbook">
+<!-- R E S O U R C E S -->
+<resources>
+<!-- concepts -->
+<resource href="../concepts/journal-about-journald.xml" xml:id="_journal-about-journald"/>
+ <resource href="../concepts/journal-structure.xml" xml:id="_journal-structure"/>
+ <resource href="../concepts/journactl-about.xml" xml:id="_journactl-about"/>
+<!-- glue -->
+<!-- tasks--> 
+<resource href="../tasks/journald-configure.xml" xml:id="_journald-configure"/> 
+<resource href="../tasks/systemd-journald-troubleshooting.xml" xml:id="_systemd-journald-troubleshooting"/> 
+<resource href="../tasks/journald-filter-journals.xml" xml:id="_journald-filter-journals"/> 
+<!-- references-->
+<resource href="../references/journalctl-usage.xml" xml:id="_journalctl-usage"/> 
+</resources>
+
+<!-- Appendix -->
+<resources>
+<resource href="../common/legal.xml" xml:id="_legal">
+<description>Legal Notice</description>
+</resource>
+<resource href="../common/license_gfdl1.2.xml" xml:id="_gfdl">
+<description>GNU Free Documentation License</description>
+</resource>
+</resources>
+<structure renderas="article" xml:id="sles-journald">
+<merge>
+<title>Mastering System Logs: From <command>systemd-journald</command> to <command>journalctl</command></title>
+<!-- History -->
+<revhistory xml:id="rh-sles-journald">
+<revision><date>2025-11-26</date>
+<revdescription>
+<para>
+Initial version
+</para>
+</revdescription>
+</revision>
+</revhistory>
+<!-- Maintainer -->
+<meta name="maintainer" content="[email protected]" its:translate="no"/>
+<!-- Architecture -->
+<meta name="architecture" its:translate="no">
+<phrase>&x86-64;</phrase>
+<phrase>&power;</phrase>
+<phrase>&zseries;</phrase>
+<phrase>&aarch64;</phrase>
+</meta>
+<!-- Productname & Version -->
+<meta name="productname">
+<productname version="16.0">&sles;</productname>
+<productname version="16.0">&sles4sap;</productname>
+<productname version="16.0">&sleha;</productname> 
+</meta>
+<!-- Social Media -->
+<meta name="title">Mastering System Logs: From <command>systemd-journald</command> to <command>journalctl</command></meta>
+<meta name="description">
+Learn how to view and manage &productnameshort; logs using <command>journalctl</command></meta>
+<!-- Search -->
+<meta name="social-descr">View and filter logs with <command>journalctl</command></meta>
+<!-- Task -->
+<meta name="task" its:translate="no">
+<phrase>Configuration</phrase>
+<phrase>Storage</phrase>
+<phrase>Maintenance</phrase>
+<phrase>Administration</phrase>
+</meta>
+
+<meta name="category" its:translate="no"><phrase>Systems Management</phrase>
+</meta>
+<!-- Series -->
+<meta name="series" its:translate="no">Products &amp; Solutions</meta>
+
+<dm:docmanager xmlns:dm="urn:x-suse:ns:docmanager">
+<dm:bugtracker>
+<dm:url>https://bugzilla.suse.com/enter_bug.cgi</dm:url>
+<dm:component>Documentation</dm:component>
+<dm:product os="sles">SUSE Linux Enterprise Server 16.0</dm:product>
+<dm:product os="sles4sap">SUSE Linux Enterprise Server 16.0</dm:product>
+<dm:product os="sleha">SUSE Linux Enterprise Server 16.0</dm:product> 
+<dm:assignee>[email protected]</dm:assignee>
+</dm:bugtracker>
+<dm:translation>yes</dm:translation>
+</dm:docmanager>
+<abstract>
+<variablelist>
+<varlistentry>
+<term>WHAT?</term>
+<listitem>
+<para>
+View and analyze logs from <command>systemd-journald</command> using the <command>journalctl</command> command-line tool.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>WHY?</term>
+<listitem>
+<para>
+This article provides a complete overview of tasks that can be performed using the <command>journalctl</command> command-line tool.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>EFFORT</term>
+<listitem>
+<para>
+The average reading time of this article is approximately 30 minutes.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>GOAL</term>
+<listitem>
+<para>
+You will be able to view your system logs using <command>journalctl</command>.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>REQUIREMENTS</term>
+<listitem>
+<para>
+You must have &sudo; privileges.
+</para>
+</listitem>
+</varlistentry>
+</variablelist>
+</abstract>
+</merge>
+<module renderas="section" resourceref="_journal-about-journald">
+  <module renderas="section" resourceref="_journald-configure"/>
+  </module>
+  <module renderas="section" resourceref="_journal-structure"/>
+<module renderas="section" resourceref="_journactl-about">
+<module renderas="section" resourceref="_journalctl-usage"/>
+</module>
+<module renderas="section" resourceref="_journald-filter-journals"/>
+
+<module renderas="section" resourceref="_systemd-journald-troubleshooting"/>
+<module resourceref="_legal"/>
+<module resourceref="_gfdl">
+<output renderas="appendix"/>
+</module>
+</structure>
+</assembly>

concepts/journactl-about.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This file originates from the project https://github.com/openSUSE/doc-kit -->
+<!-- This file can be edited downstream. -->
+<!DOCTYPE topic
+[
+  <!ENTITY % entities SYSTEM "../common/generic-entities.ent">
+    %entities;
+]>
+<!-- refers to legacy doc: <add github link to legacy doc piece, if applicable> -->
+<!-- point back to this document with a similar comment added to your legacy doc piece -->
+<!-- refer to README.md for file and id naming conventions -->
+<!-- metadata is dealt with on the assembly level -->
+<topic xml:id="journald-about-journactl"
+ role="concept" xml:lang="en"
+ xmlns="http://docbook.org/ns/docbook" version="5.2"
+ xmlns:its="http://www.w3.org/2005/11/its"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ xmlns:trans="http://docbook.org/ns/transclusion">
+  <info>
+    <title>The <command>journalctl</command> command</title><!-- can be changed via merge in the assembly -->
+    <!--add author's email address-->
+    <meta name="maintainer" content="[email protected]" its:translate="no"/>
+    <abstract><!-- can be changed via merge in the assembly -->
+      <para>
+<command>journalctl</command> is a command-line utility used to query and display logs collected by
+the <command>systemd-journald</command>.
+    </para>    
+    </abstract>
+  </info>
+  <para>
+    Because the logging system stores data in a binary format (for performance and security) rather
+    than plain text, you cannot use standard tools like <command>cat</command> or
+    <command>less</command> to open the files directly. So, the <command>journalctl</command>
+    command decodes the data and displays it according to the provided parameters.
+  </para>
+
+</topic>

concepts/journal-about-journald.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE topic
+[
+  <!ENTITY % entities SYSTEM "../common/generic-entities.ent">
+    %entities;
+]>
+<!-- refers to legacy doc: <add github link to legacy doc piece, if applicable> -->
+<!-- point back to this document with a similar comment added to your legacy doc piece -->
+<!-- refer to README.md for file and id naming conventions -->
+<!-- metadata is dealt with on the assembly level -->
+<topic xml:id="concept-about-journald"
+ role="concept" xml:lang="en"
+ xmlns="http://docbook.org/ns/docbook" version="5.2"
+ xmlns:its="http://www.w3.org/2005/11/its"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ xmlns:trans="http://docbook.org/ns/transclusion">
+  <info>
+    <title>The <command>systemd-journald</command> service</title>
+    <meta name="maintainer" content="[email protected]" its:translate="no"/>
+    <abstract>
+      <para>
+        <command>journald</command> is a &systemd; service responsible for collecting, indexing, and storing log data. The collected events include  kernel messages, initrd (initial RAM disk) messages,
+        service startup/shutdown, application events, and authentication and session data.
+      </para>
+    </abstract>   
+  </info>
+  <para>
+    On &productname;, the <literal>systemd-journald</literal> service is enabled and started by
+    default. The service logs the data into the journal described in <xref linkend="journal-what-it-is"/>.
+    </para>        
+
+
+</topic>