Deploy Rest + gRPC server deploy to k8s with ingress - go

Question

I have used a sample gRPC HelloWorld application https://github.com/grpc/grpc-go/tree/master/examples/helloworld. This example is running smoothly in local system.
I want to deploy it to kubernetes with use of Ingress.
Below are my config files.
service.yaml - as NodePort
apiVersion: v1
kind: Service
metadata:
name: grpc-scratch
labels:
run: grpc-scratch
annotations:
service.alpha.kubernetes.io/app-protocols: '{"grpc":"HTTP2"}'
spec:
type: NodePort
ports:
- name: grpc
port: 50051
protocol: TCP
targetPort: 50051
selector:
run: example-grpc
ingress.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: grpc-ingress
annotations:
nginx.org/grpc-services: "grpc"
kubernetes.io/ingress.class: "nginx"
kubernetes.io/tls-acme: true
spec:
tls:
- hosts:
- xyz.com
secretName: grpc-secret
rules:
- host: xyz.com
http:
paths:
- path: /grpc
backend:
serviceName: grpc
servicePort: 50051
I am unable to make gRPC request to the server with url xyz.com/grpc. Getting the error
{
"error": "14 UNAVAILABLE: Name resolution failure"
}
If I make request to xyz.com the error is
{
"error": "14 UNAVAILABLE: Trying to connect an http1.x server"
}
Any help would be appreciated.

Answer 1

A backend of the ingress object is a combination of service and port names
In your case you have serviceName: grpc as a backend while your service's actual name is name: grpc-scratch
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: grpc-ingress
annotations:
nginx.org/grpc-services: "grpc"
kubernetes.io/ingress.class: "nginx"
kubernetes.io/tls-acme: true
spec:
tls:
- hosts:
- xyz.com
secretName: grpc-secret
rules:
- host: xyz.com
http:
paths:
- path: /grpc
backend:
serviceName: grpc-scratch
servicePort: grpc