[grpc-io] How grpc-health-probe (gRPC health checking on Kubernetes) differentiates between liveness and readiness probes

[abhay paroha]

Hi,

I am writing one grpc service and using gRPC health checking on Kubernetes (
https://github.com/grpc-ecosystem/grpc-health-probe). In my server, I added
different implementation (one for liveness and other for readiness) of
endpoints. I am wondering how this probe utility binary differentiates
between liveness check vs readiness check? There should be some other way
to define it in yaml, not just ["bin/grpc_health_probe", "-addr=:8801"]

server = ServerBuilder.forPort(port)
  .addService(new GrpcModuleHealthCheck())
  .addService(new GrpcModuleReadinessCheck())
  .addService(ProtoReflectionService.newInstance())
  .build.start

In kubernetes deployment yaml, I am using below configurations

    livenessProbe:
      failureThreshold: 3
      exec:
        command: ["bin/grpc_health_probe", "-addr=:8801"]
      initialDelaySeconds: 240
      periodSeconds: 20
      successThreshold: 1
      timeoutSeconds: 15
    readinessProbe:
      failureThreshold: 3
      exec:
        command: ["bin/grpc_health_probe", "-addr=:8801"]
      initialDelaySeconds: 20
      periodSeconds: 20
      successThreshold: 1
      timeoutSeconds: 15

I just tested and found "GrpcModuleReadinessCheck" (the health class which
I added last) implementation is taking effect when I just exec my
kubernetes pod

kubectl exec -it <MY_POD_NAME> -- /bin/bash

bash-4.4$ ./grpc_health_probe -addr=localhost:8801
status: SERVING

I want to execute different logics for liveness and readiness probes but
right now the health implementation added at last in grpc server is taking
effect. How to achieve it?

Thanks & regards,
Abhay Dutt Paroha

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