anchor.diff:  using the `cf unmap` command:
   
   <pre class="terminal">
  -cf unmap --app blue --url demo-time.example.com
  +cf unmap-route Blue example.com -n demo-time-temp
   Unbinding demo-time.example.com from blue... OK
   </pre>
   
   After cf unmap:
   
   * The CF Router stops sending traffic to Blue.
  -Instead, it routes all traffic to demo-time.example.com to Green:
  +Instead, it routes all traffic to `demo-time.example.com` to Green:
   
   <%= image_tag("../images/blue-green/unmap.png") %>
   
   ### <a id='remove-temp-route'></a>Step 4: Remove Temporary Route to Green ###
   
  -You can now use `cf unmap` to remove the route to demo-time-temp.example.com.
  +You can now use `cf unmap` to remove the route to `demo-time-temp.example.com`.
   You can also decommission Blue, or keep it in case you need to roll back your
   changes.
   
  
positive.code: This app is a web page that displays the words "Blue time" and the date/time on
  the server.
  
  ### <a id='push-an-app'></a>Step 1: Push an App ###
  Use the `cf` command-line interface to push the application.
  Name the application "Blue" with the subdomain "demo-time."
  
  <pre class="terminal">
  cf push --path target/demo-time.war --name Blue --host demo-time
  </pre>
  
  As shown in the graphic below:
  
  * Blue is now running on Cloud Foundry.
  * The CF Router sends all traffic for demo-time.example.com traffic to Blue.
  
  <%= image_tag("../images/blue-green/blue.png") %>
  
  
negative.code: ---
  title: Blue-Green Deployment
  ---
  
  _This page assumes you are using cf v6._
  
  Blue-green deployment is a release technique that reduces downtime and risk by
  running two identical production environments called Blue and Green.
  