[Feature] Expose loadBalancerIP for head service to users

[kevin85421]

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• I had searched in the issues and found no similar feature requirement.

Description

Users may want Ray head to be accessible from outside Kubernetes. One option is to use Kubernetes Service with type LoadBalancer and specify loadBalancerIP. However, KubeRay currently does not expose loadBalancerIP to users. See https://discuss.ray.io/t/specify-ip-adress-for-the-head-as-a-loadbalancer-service-type/9008 for more details.

Use case

No response

Related issues

https://discuss.ray.io/t/specify-ip-adress-for-the-head-as-a-loadbalancer-service-type/9008

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[kevin85421]

KubeRay originally only exposed serviceType to users. Then, we found that it is not enough, and thus exposed custom annotations and labels.

I currently have two thoughts:

• Only expose loadBalancerIP in this PR.
• Expose multiple fields (e.g. service.spec) to users once.

Any thoughts? cc @DmitriGekhtman @architkulkarni @Jeffwan

[DmitriGekhtman]

We should expose as many fields as people ask for.

Probably we should have just exposed the entire service (maybe we did in the initial version?)