Please support gRPC Service

[kahirokunn]

gRPC Service does not work.

Here is an example.

server yaml.

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: grpc-ping
  namespace: default
  labels:
    networking.knative.dev/visibility: cluster-local
spec:
  template:
    spec:
      containers:
      - image: kahiro/grpc-ping-go:latest
        ports:
          - name: h2c
            containerPort: 8080

client yaml.
This is an error.

apiVersion: v1
kind: Pod
metadata:
  name: grpc-ping-client
  namespace: default
spec:
  containers:
  - args:
    - /client
    - -server_addr
    - grpc-ping.default.svc.cluster.local:80
    - -insecure
    image: kahiro/grpc-ping-go:latest
    imagePullPolicy: Always
    name: grpc-ping-client

client yaml.
This works.

apiVersion: v1
kind: Pod
metadata:
  name: grpc-ping-client-pod
  namespace: default
spec:
  containers:
  - args:
    - /client
    - -server_addr
    - 10-0-3-236.default.pod.cluster.local:8080
    - -insecure
    image: kahiro/grpc-ping-go:latest
    imagePullPolicy: Always
    name: grpc-ping-client

The difference between the two above is that they go through a Gateway configured with HTTPRoute or not.
TCPRoute or GRPCRoute must also be used.

https://gateway-api.sigs.k8s.io/concepts/api-overview/?h=grpcroute#route-resources

[dprotaso]

Which networking layer are you using (ie. istio/contour)?

[kahirokunn]

I love cilium.
cilium/cilium#20655

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[kahirokunn]

Keep

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[kahirokunn]

Keep

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[dprotaso]

Hey @kahirokunn in the last few weeks we added the necessary changes to serving and net-gateway-api so in theory you could try testing with Cillium to see if GRPC working. If you could circle back let us know.

Internally we now use the kubernetes.io/h2c appProtocol constant to signal to gateways to use h2 prior knowledge. If Cilllium supports this then it should work.

I'm going to close this out since we have this working with Contour and Istio and there's no action left for us.

[dprotaso]

I PR'd a h2c backend protocol conformance test to the gateway API repo - kubernetes-sigs/gateway-api#2456

[kahirokunn]

Thx!!