puma cluster mode + sidekiq

config_development.rb

threads 1, 4
workers 2
preload_app!

environment 'development'
bind 'tcp://0.0.0.0:3000'
ssl_bind '127.0.0.1', '5002', {
  key:  'doc/certs/server.key',
  cert: 'doc/certs/server.crt'
}

file = File.expand_path('../hooks.rb', __FILE__)
instance_eval IO.read(file), file

config_hooks.rb

on_worker_boot do
  puts "[puma] booting worker..."

  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
  end

  if defined?(Sidekiq)
    Sidekiq.redis_quit if Sidekiq.respond_to?(:redis_quit)
    Sidekiq.configure_client do |config|
      config.redis = {
        url:       #...,
        namespace: #...
      }
    end
  end

  Rails.cache.reconnect if Rails.cache.respond_to?(:reconnect)
end

on_restart do
  puts "[puma] restarting server..."

  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
  end
end

initializers_sidekiq.rb

module Sidekiq
  def self.redis_quit
    return if @redis.nil?
    @redis.shutdown { |conn| conn.quit }
    @redis = nil
  end
end