Question: Could not connect to gRPC when using mysql80 docker image.

[parikshitg]

Question

I am trying to run a few queries inside vitess vitess/vttestserver:mysql80 docker container. I am getting a gRPC connector error like

W1209 12:47:39.001213   86415 component.go:39] [core] [Channel #1 SubChannel #2]grpc: addrConn.createTransport failed to connect to {Addr: "127.0.0.1:33575", ServerName: "127.0.0.1:33575", }. Err: connection error: desc = "error reading server preface: EOF"

But the same code is working fine with vitess/vttestserver:mysql57 docker image.
Here is my code:

vtgateconn.RegisterDialer("test_grpc", grpcvtgateconn.Dial(grpcDialOptions...))

	conn, err := vtgateconn.DialProtocol(context.Background(), "grpc", "localhost:33575")
	if err != nil {
		fmt.Printf("dial protocol err: %v", err)
		return
	}
	defer conn.Close()
	
session := conn.Session(target, &query.ExecuteOptions{
		IncludedFields: query.ExecuteOptions_ALL,
	})

	_, err = session.ExecuteBatch(context.Background(), []string{
		fmt.Sprintf(queryCreateTable, "mytable"),
		fmt.Sprintf(queryCreateVindex, "mytable"),
	}, nil)
	if err != nil {
		fmt.Println("session.execute err:", err)
		return
	}

Can any one please suggest, what could be the issue here?