anchor.diff:  1. The Agent sends an information request to the Registry.
   1. The Registry responds by providing the requested information.
   1. The Agent uses the information to configure the VM.
  -
  -
  
positive.code: 
  ### <a id="registry"></a>Registry ###
  
  When a VM is created, it has no "awareness" of its own IP address or other vital information, including:
  
  * an ID for the VM
  * an ID for the volume reserved for the VM
  * IDs for disks and other devices
  * the network interface IP
  
  Agents obtain configuration information for their VMs in different ways, depending on cloud infrastructure.
  Some cloud infrastructures use the Registry for this purpose.
  
negative.code: For internal communication between the VMs that it creates, BOSH allows named DNS records.
  This means that instead of an IP address, one component could communicate with another by a host and domain name, for example:
  
  `http://postgres-db.my-deployment.com`
  
  PowerDNS is the DNS server that BOSH runs if you use this feature.
  
  ### <a id="postgres"></a> Postgres database ###
  
  