run grpc python example must use sudo command

Question

Depend on this tutorials grpc basic

I clone https://github.com/grpc/grpc to local,

cd example/python/helloworld start server python greeter_server.py

then start client python greeter_client.py , but get error

Traceback (most recent call last):
  File "greeter_client.py", line 35, in <module>
  run()
  File "greeter_client.py", line 30, in run
    response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
  File "/usr/local/lib/python3.7/site-packages/grpc/_channel.py", line 533, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "/usr/local/lib/python3.7/site-packages/grpc/_channel.py", line 467, in _end_unary_response_blocking
    raise _Rendezvous(state, None, None, deadline) grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
      status = StatusCode.UNAVAILABLE
      details = "Socket closed"
      debug_error_string = "{"created":"@1541228979.471085000","description":"Error received from peer","file":"src/core/lib/surface/call.cc","file_line":1017,"grpc_message":"Socket closed","grpc_status":14}"

then I execuse sudo python greeter_client.py , get the correct result.

Why I should add sudo to get the correct result?

Answer 1

1. I found I set a global http proxy export http_proxy=http://127.0.0.1:1087 , I closed this proxy, then It was find.

2. update greeter_client.py , change localhost to 127.0.0.1 . It's find to me.

Answer 2

Could you try few options and share your feedback:

Option - 1

another port(except 50051) in client and server ?

Option-2

Try with 0.0.0.0 in client

Thanks, Dheeraj