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Rails 3 and Capistrano
Note: Create the script
If DJ is installed as a gem don't forget to run the generator. It creates the script/delayed_job script and sets run permissions.
rails generate delayed_job
delayed_job comes with Capistrano recipes to start the script/delayed_job worker but you have to update your config/deploy.rb file to use them. There are 3 changes that need to be made:
Include the recipes
The recipes use the :rails_env variable to pass the environment to script/delayed_job.
set :rails_env, "production" #added for delayed job
Only start and stop workers on a particular server
If you have one or more servers just for delayed job, you can have your workers run just on that server like so. If you do not set
:delayed_job_server_role, it will default to
role :delayed_job, 'delayed_job.example.com' set :delayed_job_server_role, :delayed_job
Hook into Capistrano to start, stop and restart
after "deploy:stop", "delayed_job:stop" after "deploy:start", "delayed_job:start" after "deploy:restart", "delayed_job:restart" # If you want to use command line options, for example to start multiple workers, # define a Capistrano variable delayed_job_args: # # set :delayed_job_args, "-n 2"
If you are getting an error starting delayed_job in capistrano make sure you have
gem 'daemons' in your Gemfile.
Note: You may need to do more due to unresolved issues such as https://github.com/collectiveidea/delayed_job/issues/3