Sample Python gRPC test for OpenShift

Certificate

Generate certificate for the server. Uses openssl.

For the CN, use the *.apps.apps.<cluster_name>.<base_domain> wildcard hostname for OpenShift:

$ oc get ingresses.config/cluster -o jsonpath='{.spec.domain}'
apps.cluster-d3f6.d3f6.example.opentlc.com

make gen_key

Enable http/2

$ oc annotate ingresses.config/cluster ingress.operator.openshift.io/default-enable-http2=true

Create Server

You can either build the image using S2I or deploy a prebuilt image from quay.io

$ oc new-app https://github.com/tsailiming/ssl_grpc_example --name grpc

$ oc new-app --docker-image=quay.io/ltsai/python-grpc-demo --name=grpc

Configure TLS and expose route:

$ oc create secret tls tls-secret --cert=tls/tls.crt --key=tls/tls.key 
$ oc set volume dc/grpc --name=tls-secret --type=secret --secret-name=tls-secret --mount-path=/opt/app-root/src/tls --add
$ oc create route passthrough grpc --service=grpc

Run Client

Using gRPCurl:

$ HOSTNAME=`oc get route grpc -o jsonpath='{.spec.host}'`
$ grpcurl  -import-path . -proto service.proto -insecure -cert tls/tls.crt -key tls/tls.key $HOSTNAME:443 Server.Foo
{
  "message": "Hello! Current time is Thu Sep 24 14:47:30 2020"
}

Credit

This repository was originally from http://www.sandtable.com/using-ssl-with-grpc-in-python/