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Whenever is a Ruby gem that provides a nicer syntax for writing and deploying cron jobs. Leading zeros are important for whenever if you use the 24-hours format!

...must always run on all servers. E.g. starting a sidekiq process on reboot. Configuring whenever Warning Caution: this effectively removes redundancy! When your "primary cron" is down (e.g. for maintenance...

...run. You might need to handle this. If not configured otherwise, cronjobs defined in whenever's schedule.rb will only be written to the crontab of the server with the db...