Railway•12mo ago

Rails Cron Job

Hi Folks, Project ID:

I have a Rails app that needs a cron job to run every 10 minutes. I've tried a few approaches. First, I used the

I have a Rails app that needs a cron job to run every 10 minutes. I've tried a few approaches. First, I used the

whenever

 gem to run a scheduler script. Then i've also tried updating the crontab on the server by configuring my Procfile appropriately, but it seems like the script worker for running 'whenever update crontab' isn't being triggered.

 gem to run a scheduler script. Then i've also tried updating the crontab on the server by configuring my Procfile appropriately, but it seems like the script worker for running 'whenever update crontab' isn't being triggered.

web: bundle exec rake db:migrate && bundle exec rails server -p ${PORT:-3000} worker: bundle exec whenever --update-crontab

Then, I attempted using a cron job by creating an empty service and  using a rake task with the same repository, just changing the start command to run

Then, I attempted using a cron job by creating an empty service and  using a rake task with the same repository, just changing the start command to run

bundle exec rake task```. This works well. However, it seems like every time the cron job runs, it rebuilds everything from scratch, which sometimes takes a long time. Is this expected, or could it be optimized with build caching? Thank you.

5 Replies

Percy•12mo ago

Project ID: d6496119-3fda-4ccf-ba26-1050b4d6d823

Adam•12mo ago

I believe this is expected, unfortunately. Could you instead run the job on a cron schedule in-app? As in, run the app 24/7, offload as much memory as you can, then run your job using a cron scheduling package

mtaufanOP•12mo ago

Thank you for your suggestion. I'm interested in the idea of running the cron job within the app itself, but could you clarify what you mean by an "in-app cron schedule"? Are you suggesting the use of a specific Ruby gem or library for this purpose?

Adam•12mo ago

I'm not a Ruby dev, but yes. In Python for example, you would use the package schedule

Brody•12mo ago

also like to note that railway's procfile does not support worker tasks, you should use a seprate railway service just for a worker type task

Gaming

Programming

Rails Cron Job