Add support for grpcHealthCheck in BackendConfig CRD

[trietsch]

Correct me if I'm wrong, but if I understand it correctly, it's currently not possible to specify a gRPC based Health Check (using the gRPC health checking protocol and grpc-health-probe) in a BackendConfig CRD for GKE. If I'm correct, the BackendConfig CRD is generated from this spec.

The only alternatives at the moment that I see are:

1. Add a multiplexer in front of my app (such as Envoy), that will proxy gRPC traffic to my app and also expose an HTTP health check. Seems like overhead for my use case, and extra resources that are claimed.
2. Manually modify the automatically configured health check via the gcloud CLI / Google Cloud Console. Which is not preferable when using a tool such as Terraform to provision and configure resources.

Based on the current format of the BackendConfig CRD on my cluster, I'd say that it's not possible to set a gRPC Health Check. I'm running on GKE version 1.18.17-gke.1901.

Related issue is #42, however, I've created a new issue as this specifically focuses on the gRPCHealthCheck config in the Google Cloud Compute healthChecks APIs.

[JamesXNelson]

Aye! Getting this healthcheck to work has taken more than 60% of total development time for my cluster ....and it still doesn't work.

Please, please, please, will someone on GKE + GCE treat GRPC like a first-class citizen? I know I saw in docs "we decided not to play favorites and support grpc directly" ....but, seriously... if anyone is going to give full support for grpc, google seems like the best bet, eh? (I'm guessing here that gce team helps maintain this integration).

Thanks for all your hard work making kubernetes great!

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/lifecycle stale

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

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/close

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[abasu0713]

why has this been closed? Really need this! for my application. That can only use ESP..

[trietsch]

Still relevant, reopening.

/reopen

[k8s-ci-robot]

@trietsch: Reopened this issue.

In response to this:

Still relevant, reopening.

/reopen

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[trietsch]

/remove-lifecycle rotten

[tonykim-moloco]

Please Please! Really need this!

[aojea]

can you add the grpc probe to the pod itself?

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/lifecycle stale

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/lifecycle rotten

[tonykim-moloco]

/remove-lifecycle rotten

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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