Rails, using whenever gem in development

Question

Sorry quick question here from a relative Rails newbie. I'm trying to use the Whenever gem to schedule a number of rake tasks. I can't for the life of me get it to actually begin running the cron jobs on my development machine.

Judging from other stackoverflow threads, it appears I should add this:

set :environment, "development"

to my schedule.rb file. But then what?

And then how do I stop the cron jobs once they've started?

Using Rails 3.2.3 in OSX

UPDATE: the answer is to run $ whenever -w which writes the cron job to a crontab file. The system then immediately starts running that crontab file automatically.

Unfortunately, my logfile for whenever contains the following: "rake aborted! Don't know how to build task <task name>"

I'm thinking this might be due to the known crontab/rvm issue, but any suggestions are welcome.

Ashwin Yaprala · Answer 1 · 2015-12-11T09:26:40.043

80

Clear existing cron jobs.

crontab -r

Update cronjob with the environment.

whenever --update-crontab --set environment='development'

edited Dec 11 '15 at 09:26

answered Feb 26 '13 at 11:22

Ashwin Yaprala

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I would like to see a more informative description of exactly what these commands do, aimed at a beginner! – Cole Bittel Nov 15 '15 at 00:15
"crontab -r" Clear all current cron jobs whenever --update-crontab --set environment='development' – Vikram Sharma May 31 '18 at 11:19

score 8 · Answer 2 · answered Jul 17 '12 at 01:49

8

You can use the whenever command and its various options to manipulate your crontab.

$ whenever --help
Usage: whenever [options]
    -i [identifier],                 Default: full path to schedule.rb file
        --update-crontab
    -w, --write-crontab [identifier] Default: full path to schedule.rb file
    -c, --clear-crontab [identifier]
    -s, --set [variables]            Example: --set 'environment=staging&path=/my/sweet/path'
    -f, --load-file [schedule file]  Default: config/schedule.rb
    -u, --user [user]                Default: current user
    -k, --cut [lines]                Cut lines from the top of the cronfile
    -v, --version

answered Jul 17 '12 at 01:49

Conner

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Thanks. What I didn't realize was that once you write to the crontab file using `whenever -w`, the crontab start running automatically (i.e. you don't have to do anything else to execute it.) Unfortunately, my logfile for whenever says "rake aborted! Don't know how to build task " The rake task works on its own just using $ rake from the command prompt. Any suggestions? – user1377556 Jul 17 '12 at 05:31
You probably have incorrect syntax somewhere in the task or whenever event. Try to get a more informative stack trace. – Conner Jul 17 '12 at 11:14
Doing some searching around, it appears this may be an issue with RVM, which apparently has some problems with Whenever. Any suggestions on this would be most appreciated. – user1377556 Jul 18 '12 at 05:10

score 2 · Answer 3 · edited Jul 17 '12 at 11:44

2

whenever -c cron-name  #removing cronjobs

edited Jul 17 '12 at 11:44

bluish

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answered Jul 17 '12 at 08:59

Sunny

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score -1 · Answer 4 · answered Dec 02 '15 at 12:43

-1

Adding following line of code on top of config/schedule.rb worked for me.

 ENV['RAILS_ENV'] = "development"

answered Dec 02 '15 at 12:43

Satishakumar Awati

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Rails, using whenever gem in development

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