[feature] Can we use one headless service for one job?

[gaocegege]

We have ps/worker/chief for one TFJob. And now we create one headless service for one replica. I think we can use one headless service for easy-to-use.

After that, we could use {tfjob_name}-{replica_type}-{index}.{service_name}.svc.cluster.local in the code.

WDYT @johnugeorge @richardsliu

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[jtfogarty]

/area engprod /priority p2

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[tenzen-y]

/reopen We should take this to improve cluster performance.

[google-oss-prow[bot]]

@tenzen-y: Reopened this issue.

In response to this:

/reopen We should take this to improve cluster performance.

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[tenzen-y]

I realized this need by Aldo's comment.

cc: @kubeflow/wg-training-leads

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[tenzen-y]

/lifecycle frozen

[kannon92]

@tenzen-y brought this up in brainstorming around jobset/kubeflow.

We have implemented a few ways to customize network names.

[kannon92]

type Network struct {
	// EnableDNSHostnames allows pods to be reached via their hostnames.
	// Pods will be reachable using the fully qualified pod hostname:
	// <jobSet.name>-<spec.replicatedJob.name>-<job-index>-<pod-index>.<subdomain>
	// +optional
	EnableDNSHostnames *bool `json:"enableDNSHostnames,omitempty"`

	// Subdomain is an explicit choice for a network subdomain name
	// When set, any replicated job in the set is added to this network.
	// Defaults to <jobSet.name> if not set.
	// +optional
	Subdomain string `json:"subdomain,omitempty"`
}

Was what we used to control service creation for the jobset.

[gaocegege]

The suffix will differ from .svc.cluster.local according to the cluster settings. Maybe we could use a CLI parameter to config it.