max_threads_count = ENV.fetch("RAILS_MAX_THREADS", 5) min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count } threads min_threads_count, max_threads_count port ENV.fetch("PORT", 3000) environment ENV.fetch("RAILS_ENV", "development") pidfile ENV.fetch("PIDFILE", "tmp/pids/server.pid") workers ENV.fetch("WEB_CONCURRENCY", 2) preload_app! plugin :tmp_restart