puma.rb

workers Integer(ENV['PUMA_WORKERS'] || 2)

threads Integer(ENV['PUMA_MIN_THREADS']  || 1), Integer(ENV['PUMA_MAX_THREADS'] || 6)

preload_app!

port ENV['PUMA_PORT'] || 3000

environment ENV['RACK_ENV'] || 'development'

on_worker_boot do

  puts 'Puma on_worker_boot: Reconnecting ActiveRecord'
  ActiveSupport.on_load(:active_record) do
    config = ActiveRecord::Base.configurations[Rails.env] ||
        Rails.application.config.database_configuration[Rails.env]
    config['pool'] = ENV['PUMA_MAX_THREADS'] || 6
    ActiveRecord::Base.establish_connection(config)
  end

  Redis.client.reconnect unless Redis.current.client.connected?
end