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systemd/Timers


a mini tutorial on systemd timers

Contents




Read this blog post: https://balaskas.gr/blog/2015/07/17/timers-in-systemd/

Clean Up Journal

List Timers 



~> sudo systemctl list-timers


Create the Service 


~> sudo  vim /etc/systemd/system/cleanjournal.service


[Unit]
Description=Clean Up Journal Log database

[Service]
Type=simple
ExecStart=/usr/bin/journalctl --vacuum-time=7d


Create the timer 


~> sudo  vim /etc/systemd/system/cleanjournal.timer


[Unit]
Description=Clean Up Journal Log Database every week

[Timer]
OnCalendar=weekly
Persistent=true

[Install]
WantedBy=multi-user.target

List New Timer/Service 


~> sudo  systemctl list-unit-files|grep -i cleanjournal
cleanjournal.service                                             static         
cleanjournal.timer                                               disabled


Start Service 


~> sudo  systemctl start cleanjournal.service

Start Timer 


~> sudo systemctl start cleanjournal.timer

Enable Timer 


~> sudo systemctl enable cleanjournal.timer


List enabled timer 


~> sudo systemctl list-timers | grep cleanjournal
Mon 2017-07-24 00:00:00 EEST  1 day 10h left n/a                           n/a       cleanjournal.timer           cleanjournal.service