Request: Create a Service for the Pod with POD_GROUP_INDEX=0 in Distributed P/D Deployment

Hi,

I am trying to deploy a vLLM application with P/D disaggregation, where both the P and D components run in distributed mode. In this setup, we rely on Ray to form clusters for both P and D.

During testing, I noticed that for either P or D, the head node (selected as the pod with POD_GROUP_INDEX=0) does not get a corresponding Service created. Since the head pod requires a stable Service endpoint for Ray cluster initialization, this causes issues in forming the cluster.

**Request:**
Would the community consider **automatically creating a Service** for the pod with POD_GROUP_INDEX=0 in each P/D group when running in distributed mode?

This would simplify cluster formation and ensure Ray can properly bootstrap the head node.

Thank you!