認証なしで死活監視できる /up エンドポイントを追加

config/routes.rb

@@ -4,6 +4,10 @@
   # The priority is based upon order of creation:
   # first created -> highest priority.
 
+  # 死活監視用。Rails::HealthController は ApplicationController を経由しないため
+  # BASIC 認証やログインなしでアクセスできる
+  get 'up' => 'rails/health#show', as: :rails_health_check
+
   # settings
   namespace :settings do
     controller :accounts do

spec/requests/health_check_spec.rb

@@ -0,0 +1,10 @@
+require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
+
+describe 'ヘルスチェック', type: :request do
+  describe 'GET /up' do
+    it '200 を返す' do
+      get '/up'
+      expect(response).to have_http_status(:ok)
+    end
+  end
+end