Setup Resque with Rails 4 on Heroku and locally

resque_on_heroku_rails4.md

Setup Resque on Heroku for Rails 4

Resque depends on Redis, so first install Redis locally to be able to work on your project...

Install Redis locally on Mac

To install Redis locally, use the following approach on Mac OS X (using Homebrew). $ brew install redis

To test your install, firstly ensure that the Redis server is running. $ redis-server

Add Resque to your Rails project

Add these two gems to your Gemfile:

gem 'resque', "~> 1.22.0"
gem 'redis'

Run bundle

bundle install

To let Rails know we use Resque for our queues, add this line:

config.active_job.queue_adapter = :resque

Make a /lib/tasks/resque.rake file and add, to make sure your environment is available to your worker:

require 'resque/tasks'

task "resque:preload" => :environment

Add this line to your Procfile:

resque: env TERM_CHILD=1 RESQUE_TERM_TIMEOUT=7 QUEUE=* bundle exec rake resque:work

Make sure the location of Redis is known to your application (Needed for Heroku), e.g. in your .ENV file:

REDIS_URL=redis://127.0.0.1:6379

Make sure the location of Redis is explicit. Create a new file /config/initializers/redis.rb and add:

$redis = Redis.new(url: ENV["REDIS_URL"])

When launching your server now, background jobs will be processed in parallel. Make sure you have the redis server running simultaneously.

Install Resque on Heroku

Again, first install Redis, I added this Add-on to my project: Heroku Redis

REDIS_URL

Add a new Config Variable REDIS_URL having the location of your Heroku Redis (which you will receive after installing the add-on)

Deploy your application to Heroku

git push heroku master

Enable your worker

At "Resources" you will find a new Dyno: resque. Enable this one :)