Resque, Resque Server, on RedisToGo with Heroku

Question

I've been trying to get Resque (with Resque server) & RedisToGo working on heroku (cedar) for awhile now, but I keep running into this error:

Redis::CannotConnectError (Error connecting to Redis on 127.0.0.1:6379 (ECONNREFUSED)):

Its working locally, and I can access redis just fine in Heroku's console for my app.

My Procfile has:

web: bundle exec thin start -p $PORT -e $RACK_ENV
web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb
resque: env TERM_CHILD=1 RESQUE_TERM_TIMEOUT=10 bundle exec rake resque:work

My Gemfile has:

gem 'redis'

#Background queue
gem 'resque', '~> 1.22.0', :require => "resque/server"

lib/tasks/resque.rake:

require 'resque/tasks'

task "resque:setup" => :environment do
  ENV['QUEUE'] = '*'
end

desc "Alias for resque:work (To run workers on Heroku)"
task "jobs:work" => "resque:work"

routes.rb:

  mount Resque::Server.new, :at => "/resque" 

initializers: redis.rb:

uri = URI.parse(ENV["REDISTOGO_URL"])
REDIS = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
Resque.redis = REDIS

resque.rb:

Dir["#{Rails.root}/app/workers/*.rb"].each { |file| require file }
Resque.after_fork = Proc.new { ActiveRecord::Base.establish_connection }

then in my app/workers directory I have something like myjob.rb

I feel like I'm going in circles here, any ideas?

Answer 1

I think your Procfile has a typo. Why do you have two web processes? I'd stick with one and use unicorn.

web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

When using unicorn with resque, you have to define the resque redis connection each time unicorn forks. Here are the relevant files.

config/initializers/redis.rb

uri = URI.parse(ENV["REDIS_WORKER"])
REDIS_WORKER = Redis.new(host: uri.host, port: uri.port, password: uri.password)

config/initializers/resque.rb

Resque.redis = REDIS_WORKER

config/unicorn.rb

before_fork do |server, worker|
  if defined?(Resque)
    Resque.redis.quit
    Rails.logger.info("Disconnected from Redis")
  end
end

after_fork do |server, worker|
  if defined?(Resque)
    Resque.redis = REDIS_WORKER
    Rails.logger.info("Connected to Redis")
  end
end

See this gist for the complete unicorn.rb