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ruby-on-railsamazon-ec2cronwhenever

Executing Rails 'whenever' gem when EC2 Instance Moves

I use the 'whenever' gem for my rails cron file in EC2 and it works great. "Whenever -w" writes it and I never have to worry about it again. The problem is when my instance has a planned reboot. The rails app get passed to a new instance and the whole process is seamless with no downtime, but the new instance does not have my cron file.

How can I make sure that the cron file gets written when I move to a new instance? Is there a way to run it on app start or something like that? Thanks.

Solution

  • Whenever is a command. If you run:

    bundle exec whenever --help

    You will get a full list of flags. You'll want:

    bundle exec whenever -w /path/to/schedule.rb

    You can add a simple shell script to /etc/init.d

    #!/bin/bash
cd /to/app && /full/path/to/bundle exec whenever -w /full/path/to/schedule.rb