Typically, you will create one service definition for each tenant in an ESXi cluster. Each service definition specifies the OVF (PAN-OS version) used to deploy the firewall and includes the configuration for the VM-Series firewalls installed on the ESXi cluster. To specify the configuration, a service definition must have a unique template, a unique device group and the license auth-codes for the firewalls that will be deployed using the service definition. When the firewall is deployed, it connects to Panorama and receives both its configuration settings—including the zone(s) for each tenant or department that the firewall will secure—and its policy settings from the device group specified in the service definition.