SIMPLE SOLUTIONS

SYSTEMD-CRONTAB-GENERATOR - reference manual online

Translate cron schedules in systemd Units.

Chapter
2014-06-29
SYSTEMD-CRONTAB-GENERATOR(8)        systemd-crontab-generator        SYSTEMD-CRONTAB-GENERATOR(8)

NAME systemd-crontab-generator - translate cron schedules in systemd Units
SYNOPSIS /lib/systemd/system-generators/systemd-crontab-generator output_folder
DESCRIPTION systemd-crontab-generator is a generator that translates the legacy cron files (see FILES) into native systemd units & timers. It is not meant to be run manually, it is called automatically by systemd. It is run * during early boot, * a second time by cron-after-var.service, only if /var is a separate mount, in order to process user crontabs in /var/spool/cron/crontabs; if any, * after each manual updates to the cron files, (*) * and when distribution packages add files in /etc/cron.d/. (*) (*): those are monitored by cron-update.path systemd-crontab-generator implements the generator specification[1].
FILES /etc/crontab System crontab, see crontab(5). /etc/cron.d Directory for system crontabs provided by packages. /etc/anacrontab See anacrontab(5). /var/spool/cron/crontabs Directory for users crontabs. /run/systemd/generator Directory where the generated units are stored. /run/crond.reboot Flag used to avoid running @reboot jobs again after boot. /var/lib/systemd/timers Directory where systemd store time stamps needed for the Persistent feature.
DIAGNOSTICS With systemd >= 209, you can execute systemctl list-timers to have a overview of timers and know when they will elapse. If you get errors like /lib/systemd/system-generators/systemd-crontab-generator failed with error code 1. in the journal, you can manually run /lib/systemd/system-generators/systemd-crontab-generator /tmp to get a more verbose error message.
SEE ALSO systemd.cron(7),crontab(5),systemd.unit(5),systemd.timer(5)
NOTES 1. generator specification http://www.freedesktop.org/wiki/Software/systemd/Generators
AUTHOR Konstantin Stepanov <@kstep.me> for the generator Alexandre Detiste <@detiste.be> for this man page
systemd-cron 1.5.3 2014-06-29 SYSTEMD-CRONTAB-GENERATOR(8)
This manual Reference Other manuals
systemd-crontab-generator(8) referred by anacrontab(5) | crontab(5) | systemd.cron(7)
refer to anacrontab(5) | crontab(5) | systemd.cron(7) | systemd.timer(5) | systemd.unit(5)