{{tag>systemd systemctl timer timers journalctl linux debian setup customise customisation}}
======systemd Stuff======
  * [[https://linuxconfig.org/how-to-create-systemd-service-unit-in-linux|How to create systemd service unit in Linux]]
  * [[https://unix.stackexchange.com/questions/246935/set-systemd-service-to-execute-after-fstab-mount|Set systemd service to execute after fstab mount]]
  * DigitalOcean Tutorials systemd:
    * [[https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units|How To Use Systemctl to Manage Systemd Services and Units]]
    * [[https://www.digitalocean.com/community/tutorials/understanding-systemd-units-and-unit-files|Understanding Systemd Units and Unit Files]]
    * [[https://www.digitalocean.com/community/tutorials/how-to-use-journalctl-to-view-and-manipulate-systemd-logs|How To Use Journalctl to View and Manipulate Systemd Logs]]
    * [[https://www.digitalocean.com/community/tutorials/systemd-essentials-working-with-services-units-and-the-journal|Systemd Essentials: Working with Services, Units, and the Journal]]
  * [[https://cloudnull.io/2017/05/nfs-mount-via-systemd/|NFS mount via systemd]]
  * [[https://www.golinuxcloud.com/start-systemd-service-after-nfs-mount/|How to start systemd service after NFS mount in Linux]]


[[https://www.tecmint.com/systemd-analyze-monitor-linux-bootup-performance/|systemd-analyze – Find System Boot-up Performance Statistics in Linux]]

=====Journalctl stuff=====

''man journald.conf'' manual page for journald.conf\\
''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.\\
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''sudo systemctl force-reload systemd-journald'' to reload journald or restart instead
''sudo journalctl -u systemd-journald'' to check status of journal.\\
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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====
''timedatectl'' to print current time date on cli\\ 
''Date'' to print basic time date only on cli\\ 
''timedatectl list-timezones'' to set available time zones\\ 
''sudo timedatectl set-timezone australia/perth'' to set timezone\\ 

Some links:
  *Arch Linux [[https://wiki.archlinux.org/index.php/Systemd/Timers|systemd/Timers]]
  *Putorius [[https://www.putorius.net/using-systemd-timers.html|Using systemd Timer Units to Schedule Jobs ]]
  *Linux.com [[https://www.linux.com/tutorials/systemd-timers-two-use-cases-0/|Systemd Timers: Three Use Cases]]

  *Freedesktop.org  [[https://www.freedesktop.org/software/systemd/man/systemd.time.html|systemd.time — Time and date specifications]] and [[https://www.freedesktop.org/software/systemd/man/systemd.timer.html|systemd.timer — Timer unit configuration]]

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