config/puma.rb
workers Integer(ENV["WEB_CONCURRENCY"] || 2)
threads_count = Integer(ENV["MAX_THREADS"] || 5)
threads threads_count, threads_count
preload_app!
rackup DefaultRackup
port ENV["PORT"] || 3000
environment ENV["RACK_ENV"] || "development"
on_worker_boot do
# Worker specific setup for Rails 4.1+
# See: https://devcenter.heroku.com/articles/
# deploying-rails-applications-with-the-puma-web-server#on-worker-boot
ActiveRecord::Base.establish_connection
end