anchor.diff:  - (**Optional**) Robust production web server for Ruby and RoR apps, such as Unicorn
   * Your Rails 4.x app that runs locally on your workstation
   
  -### <a id='yourapp-step1'></a>Step 1: Add the rails_12factor Gem to Your Gemfile ###
  +### Step 1: Add the rails_12factor Gem to Your Gemfile ###
   
   1. Add `gem rails_12factor group: :production` to your Gemfile.
   
  
positive.code: 
    `cf push [APP_NAME]` pushes the specified app from the current directory to <%=vars.product_short%>. Use the `-n` flag to create a unique host name for the app to avoid URL collisions with other apps.
  
    `cf push` automatically searches for an [application manifest YAML file](./../../devguide/deploy-apps/manifest.html) (`manifest.yml`) and also determines the appropriate [buildpack](./index.html) for the app.  A manifest specifies what `cf push` should do with the app and the buildpack provides framework and runtime support for your app. 
  
    The example shows the terminal output of deploying the `rails_sample_app`. `cf push` uses the instructions in the manifest file to create the app, create and bind and the route, and upload the app to <%=vars.product_short%>. It then binds the app to the `rails-postgres` service you defined in the previous step, and follows the instructions in the manifest to start one instance of the app with 256M. After the app starts, the output displays the health and status of the app.
  
  
negative.code: 
  </pre>
  
  ### Step 4: Configure the Manifest File  ###
  
  You can specify deployment options in a manifest that the `cf push` command uses.
  
  For example, this section describes how to configure the manifest to bind the service that you created in the previous step. For more information about application manifests and supported attributes, refer to the [Deploying with Application Manifests](./../../devguide/deploy-apps/manifest.html) topic.
  
  To bind a service to your app, add a `services` block to the `applications` block and specify the service instance you created in Step 3.
  
  