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ruby-on-railsredisresqueunicorn

Resque is not picking up Redis configuration settings

I am having unexpected and significant problems trying to get a Rails app, running under Unicorn, to connect to a password-protected Redis server.

Using bundle exec rails c production on the command line, I can issue commands through Resque.redis. However, it seems that my configuration is being lost when it's forked under Unicorn.

Using a non-password-protected Redis server Just Works. However, I intend to run workers on other servers than where the Redis server lives, so I need this to be password protected.

I have also had success in using a password protected (using the same technique) but using Passenger rather than Unicorn.

I have the following setup:

# config/resque.yml

development: localhost:6379
test: localhost:6379
production: redis://user:[email protected]:6379

.

# config/initializers/redis.rb

rails_root = ENV['RAILS_ROOT'] || File.dirname(__FILE__) + '/../..'
rails_env = ENV['RAILS_ENV'] || 'development'

$resque_config = YAML.load_file(rails_root + '/config/resque.yml')
uri = URI.parse($resque_config[rails_env])
Resque.redis = Redis.new(host: uri.host, port: uri.port, password: uri.password)

.

# unicorn.rb bootup file

preload_app true

before_fork do |server, worker|
  Redis.current.quit
end

after_fork do |server, worker|
  Redis.current.quit
end

.

Solution

  • UPDATED Totally different idea based on @lmarlow's comment to a resque issue.

    I bet it breaks wherever you have Redis ~>3 (I mean the ruby client version, not the server version).

    As of this writing, Resque needs Redis ~>2 but doesn't specify that in its gemspec. Therefore you have to help it out by adding this to your Gemfile:

    gem 'redis', '~>2' # until a new version of resque comes out
gem 'resque'

    Also, make sure that bundler is being used everywhere. Otherwise, if your system has a new version of the Redis gem, it will get used and Resque will fail like before.

    Finally, a cosmetic note... you could simplify the config to:

    # config/initializers/redis.rb
$resque_redis_url = uris_per_environment[rails_env] # note no URI.parse
Resque.redis = $resque_redis_url

    and then

    # unicorn.rb bootup file
after_fork do |server, worker|
  Resque.redis = $resque_redis_url
end