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diff --git a/nixos/doc/manual/from_md/administration/logging.chapter.xml b/nixos/doc/manual/from_md/administration/logging.chapter.xml new file mode 100644 index 00000000000..4da38c065a2 --- /dev/null +++ b/nixos/doc/manual/from_md/administration/logging.chapter.xml @@ -0,0 +1,45 @@ +<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-logging"> + <title>Logging</title> + <para> + System-wide logging is provided by systemd’s + <emphasis>journal</emphasis>, which subsumes traditional logging + daemons such as syslogd and klogd. Log entries are kept in binary + files in <literal>/var/log/journal/</literal>. The command + <literal>journalctl</literal> allows you to see the contents of the + journal. For example, + </para> + <programlisting> +$ journalctl -b +</programlisting> + <para> + shows all journal entries since the last reboot. (The output of + <literal>journalctl</literal> is piped into <literal>less</literal> + by default.) You can use various options and match operators to + restrict output to messages of interest. For instance, to get all + messages from PostgreSQL: + </para> + <programlisting> +$ journalctl -u postgresql.service +-- Logs begin at Mon, 2013-01-07 13:28:01 CET, end at Tue, 2013-01-08 01:09:57 CET. -- +... +Jan 07 15:44:14 hagbard postgres[2681]: [2-1] LOG: database system is shut down +-- Reboot -- +Jan 07 15:45:10 hagbard postgres[2532]: [1-1] LOG: database system was shut down at 2013-01-07 15:44:14 CET +Jan 07 15:45:13 hagbard postgres[2500]: [1-1] LOG: database system is ready to accept connections +</programlisting> + <para> + Or to get all messages since the last reboot that have at least a + <quote>critical</quote> severity level: + </para> + <programlisting> +$ journalctl -b -p crit +Dec 17 21:08:06 mandark sudo[3673]: pam_unix(sudo:auth): auth could not identify password for [alice] +Dec 29 01:30:22 mandark kernel[6131]: [1053513.909444] CPU6: Core temperature above threshold, cpu clock throttled (total events = 1) +</programlisting> + <para> + The system journal is readable by root and by users in the + <literal>wheel</literal> and <literal>systemd-journal</literal> + groups. All users have a private journal that can be read using + <literal>journalctl</literal>. + </para> +</chapter> |