addons.md

Free addons!

heroku addons:add memcachier
heroku addons:add sendgrid
heroku addons:add newrelic
heroku addons:add pgbackups
heroku addons:add papertrail

Gemfile

group :production do
  gem 'unicorn'

  # Enable gzip compression on heroku, but don't compress images.
  gem 'heroku-deflater'

  # Heroku injects it if it's not in there already
  gem 'rails_12factor'
end

gem 'memcachier'
gem 'dalli'
# Fast IO for memcache
gem 'kgio'

# Serve static assets through Rack + Memcache
# https://devcenter.heroku.com/articles/rack-cache-memcached-rails31
gem 'rack-cache'

Procfile

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

production.rb

# config/environments/production.rb

# ...

  # Enable Rails's static asset server for Heroku
  config.serve_static_assets = true

  # Set static assets cache header. rack-cache will cache those.
  config.static_cache_control = "public, max-age=31536000"

  config.cache_store = :dalli_store

  client = Dalli::Client.new(ENV["MEMCACHIER_SERVERS"],
                             :value_max_bytes => 10485760,
                             :expires_in => 1.day)

  # Configure rack-cache for using memcachier
  config.action_dispatch.rack_cache = {
    :metastore    => client,
    :entitystore  => client
  }

  # Send emails via sendgrid
  config.action_mailer.smtp_settings = {
    :address        => 'smtp.sendgrid.net',
    :port           => '587',
    :authentication => :plain,
    :user_name      => ENV['SENDGRID_USERNAME'],
    :password       => ENV['SENDGRID_PASSWORD'],
    :domain         => 'heroku.com',
    :enable_starttls_auto => true
  }

# ...

unicorn.rb

# config/unicorn.rb

worker_processes 3
timeout 30
preload_app true

before_fork do |server, worker|
  # Replace with MongoDB or whatever
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
    Rails.logger.info('Disconnected from ActiveRecord')
  end

  # If you are using Redis but not Resque, change this
  if defined?(Resque)
    Resque.redis.quit
    Rails.logger.info('Disconnected from Redis')
  end

  sleep 1
end

after_fork do |server, worker|
  # Replace with MongoDB or whatever
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
    Rails.logger.info('Connected to ActiveRecord')
  end

  # If you are using Redis but not Resque, change this
  if defined?(Resque)
    Resque.redis = ENV['REDIS_URI']
    Rails.logger.info('Connected to Redis')
  end
end