anchor.diff:  [Node.js](../../buildpacks/node/node-tips.html#env-var), and
   [Ruby](../../buildpacks/ruby/ruby-tips.html#env-var).
   
  +### <a id='CF-INSTANCE-ADDR'></a>CF\_INSTANCE\_ADDR ###
  +The [CF\_INSTANCE\_IP](#CF-INSTANCE-IP) and [CF\_INSTANCE\_PORT](#CF-INSTANCE-PORT) of the app instance in the format `IP:PORT`.
  +
  +`CF_INSTANCE_ADDR=1.2.3.4:5678`
  +
  +### <a id='CF-INSTANCE-GUID'></a>CF\_INSTANCE\_GUID ###
  +The GUID of the application. Available only to instances on Diego cells.
  +
  +`CF_INSTANCE_GUID=41653aa4-3a3a-486a-4431-ef258b39f042`
  +
  +### <a id='CF-INSTANCE-INDEX'></a>CF\_INSTANCE\_INDEX ###
  +The index number of the app instance.
  +
  +`CF_INSTANCE_INDEX=0`
  +
  +### <a id='CF-INSTANCE-IP'></a>CF\_INSTANCE\_IP ###
  +The external IP address of the host running the app instance.
  +
  +`CF_INSTANCE_IP=1.2.3.4`
  +
  +### <a id='CF-INSTANCE-PORT'></a>CF\_INSTANCE\_PORT ###
  +Same as the [PORT](#PORT) of the app instance.
  +
  +`CF_INSTANCE_PORT=5678`
  +
  +### <a id='CF-INSTANCE-PORTS'></a>CF\_INSTANCE\_PORTS ###
  +
  +The list of mappings between internal (container-side) and external
  +(host-side) ports allocated to the instance's container.
  +Note that not all of the internal ports are necessarily available for the
  +application to bind to, as some of them may be used by system-provided
  +services that also run inside the container.
  +On the DEAs, these internal and external values will be the same, but on Diego
  +cells, they may differ.
  +
  +`CF_INSTANCE_PORTS=[{external:61045,internal:5678},{external:61046,internal:2222}]`
  +
  +
   ### <a id='HOME'></a>HOME ###
   Root folder for the deployed application.
   
  
positive.code: 2cd34-5678-abcd-0123-abcdef987654","name":"my-app","uris":["my-app.example.com"]
  ,"users":null}
  ~~~
  
  ### <a id='VCAP-APP-PORT'></a>VCAP\_APP\_PORT ###
  
  Deprecated name for the [PORT](#PORT) variable, defined above.
  
  
  ### <a id='VCAP-SERVICES'></a>VCAP\_SERVICES ###
  
negative.code: 
  Environment variables are the means by which the Cloud Foundry runtime
  communicates with a deployed application about its environment.
  This page describes the environment variables that the runtime
  and buildpacks set for applications.
  
  For information about setting your own application-specific environment
  variables, refer to the [Set Environment Variable in a Manifest](./manifest.html#env-block) section in
  