Docker + rails + redis - rescuers not working

I have created a docker environment that creates 3 images: rails, postgresql and redis. It works well enough, but I found my redis image had no workers.

Docker info

My docker-compose.yml looks like this

web:  
  build: .
  command: bundle exec unicorn -p 3000 -c config/unicorn.rb
  volumes:
    - .:/fitmo
    - ../fitmo-core:/fitmo-core
  ports:
    - "3000:3000"
  links:
    - db
    - redis
  environment:
    - REDIS_URL=redis://redis:6379

db:
  build: ./db/docker-files
  ports:
    - "5432"

redis:  
  image: redis:2.8
  ports:
    - "6379"

      

        
        
        
      

    

Resque config

require 'resque'
require 'resque-scheduler'
require 'resque_scheduler/server'
require 'appsignal/integrations/resque'
require 'yaml'

if Rails.env.test?
  require 'mock_redis'
  $redis = MockRedis.new
else
  uri = URI.parse(ENV['REDIS_URL'])
  $redis = Redis.new(host: uri.host, port: uri.port, password: uri.password)
end

Resque.redis = $redis
Resque.schedule = YAML.load_file(File.join(Rails.root, 'config/resque_schedule.yml'))

Resque.before_fork do
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

Resque.after_fork do
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end

module Resque

  def queued_jobs
    queues = Hash.new
    Resque.queues.each do |queue|
      jobs = []
      Resque.peek(queue, 0, 5000).each do |job|
        jobs.push({klass: job['class'], args: job['args']})
      end
      queues[queue] = jobs
    end
    queues
  end

  def queued?(klass, *args)
    queued_jobs.select do |job|
      job[:klass] == klass.to_s && job[:args] == args
    end.any?
  end

  def enqueue_once(klass, *args)
    enqueue(klass, *args) unless queued?(klass, *args)
  end

end

      

        
        
        
      

    

Ruby Gems

Below are the matching gems. The commented versions are the newest versions of the gems, but I don't think this is a problem as the current versions work fine in Heroku environments. I also have a rescue mail and a planner for thoroughness. They don't play for the question

gem 'redis',            '3.0.7'         #'~> 3.2.0'
gem 'resque',           '~> 1.25.2'     #'~> 1.25.2'
gem 'resque_mailer',    '~> 1.0.1'      #'~> 2.2.7'
gem 'resque-scheduler', '~> 2.5.5'      #'~> 4.0.0'

      

        
        
        
      

    

Testing information

I have confirmed that redis is available from the web container by telnetting to the redis host on port 6379. I also output the Rescue.info value which shows there are items in the queue, but now the workers are running

resque info: {:pending=>1, :processed=>0, :queues=>2, :workers=>0, :working=>0, :failed=>0, :servers=>["redis://redis:6379/0"], :environment=>"development"}

      

        
        
        
      

    

I am stuck at this point as I am not sure how to get the workers to work. Any suggestions?