grpc probes component missing

[yogeek]

Describe the bug

GRPC probes are enabled by default the kustomize README mentions a component to enable GRPC probes but it is missing

To Reproduce

deploy the 0.8.0 on a 1.23 k8s cluster => pod probes are GRPC but incompatible with a <1.24 cluster

[NimJay]

Hi @yogeek,

Thanks for reporting this issue! :) Unfortunately, Online Boutique (as of v0.8.0) no longer includes the grpc-health-probe binary. Online Boutique's gRPC microservices rely on the gRPC health-check probes that are built into Kubernetes.

I will correct the docs via https://github.com/GoogleCloudPlatform/microservices-demo/pull/1893. We made this decision because:

• on 2023 April 7, Stable GKE clusters using 1.23 were auto-upgraded to 1.24. See schedule for release channels.
• the end of life for GKE 1.23 is 2023 July 31.
• one of the primary purposes of this repo is to showcase GKE

Sorry for the inconvenience! If you really need to use Kubernetes 1.23 or lower, you might be able to use Online Boutique v0.7.0 or lower. But I discourage using older versions of Online Boutique, because we don't provide active support for older versions.

git fetch --all --tags
git checkout tags/v0.7.0

Note: That "native-grpc-health-check" Kustomize component is not what you need. That component removes the grpc-health-probe binary and uses built-in Kubernetes probes. What you're looking for is the default (base) deployment of 0.7.0 or older.

Hope this helps. Thanks again!

[yogeek]

Thank you for your help @NimJay 👍 I am going to use 0.7.0 for now and if I have time, see if I can patch the 0.8.0 probes with kustomize to make it compatible with K8s 1.23 until we upgrade to 1.24.