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home_server:home_server_setup:other_services:systemd [2021-03-01 Mon wk09 18:35] – [Journalctl stuff] baumkphome_server:home_server_setup:other_services:systemd [2023-12-26 Tue wk52 11:39] (current) – baumkp
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 +{{tag>systemd systemctl timer timers journalctl linux debian setup customise customisation}}
 ======systemd Stuff====== ======systemd Stuff======
   * [[https://linuxconfig.org/how-to-create-systemd-service-unit-in-linux|How to create systemd service unit in Linux]]   * [[https://linuxconfig.org/how-to-create-systemd-service-unit-in-linux|How to create systemd service unit in Linux]]
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 ''man journald.conf'' manual page for journald.conf\\ ''man journald.conf'' manual page for journald.conf\\
 ''man journalctl'' manual page for journalctl\\ ''man journalctl'' manual page for journalctl\\
 +
 +Edit ''sudo vim /etc/systemd/journald.conf'' make variable ''Storage=persistent'' to make journald store the journal files in ''/var/log/journal'', this will create directory if necessary. This also ensure log files are available from previous boots.\\
 +\\
 +''sudo systemctl force-reload systemd-journald'' to reload journald or restart instead
 +''sudo journalctl -u systemd-journald'' to check status of journal.\\
 +\\
 +some useful flag and inputs:
 +  *''sudo journalctl -b'' to see current boot journal only use ''-b -1'' to see last boot entries.
 +  *''journalctl --list-boots'' to list all available journaled boots.
 +  *''sudo journalctl -u pppoe'', use u flag to see specified unit files only.
 +  *''sudo journalctl -k'' to see kernel messages only
 +  *''sudo journalctl -p 3'' to see only specified error priority messages and more severe. 
 +    * 0: emerg
 +    * 1: alert
 +    * 2: crit
 +    * 3: err
 +    * 4: warning
 +    * 5: notice
 +    * 6: info
 +    * 7: debug
 +  * ''-r'' flag is used to show in reverse chronological order.
 +some links:\\
 +[[https://www.linode.com/docs/guides/how-to-use-journalctl/|Use journalctl to View Your System's Logs]]
 =====systemd timers==== =====systemd timers====
 ''timedatectl'' to print current time date on cli\\  ''timedatectl'' to print current time date on cli\\