anchor.diff:      balance  roundrobin
       $__nova_vnc_backend_servers__
   
  -frontend heat-cfn *:8000
  +frontend heat-cfn
  +    bind :8000
       default_backend heat-cfn-api-backend
   
  -frontend heat-srv *:8004
  +frontend heat-srv
  +    bind:8004
       default_backend heat-api-backend
   
   backend heat-api-backend
  
positive.code: 
  $__keystone_admin_backend_servers__
  
  frontend openstack-glance *:9292
      default_backend    glance-backend
  
  backend glance-backend
  
negative.code:     default-server error-limit 1 on-error mark-down
  $__glance_backend_servers__
  
  frontend openstack-cinder 
      bind :8776
      default_backend  cinder-backend
  
  backend cinder-backend
  