gRPC over Unix Socket Domain

server-client.go

// SERVER SIDE 
SockAddr := "/tmp/sample.sock"

func main() {
	if err := os.RemoveAll(SockAddr); err != nil {
		log.Fatal(err)
	}

	listener, err := net.Listen("unix", SockAddr)

	if err != nil {
		log.Fatal("listen error:", err)
	}

	grpcServer := grpc.NewServer()

	someProtopb.RegisterSomeServiceServer(grpcServer, &server{})

	if grpcServer.Serve(listener); err != nil {
		log.Fatalf("Failed to start server: %v \n", err)
	}
}

// CLIENT SIDE
func main() {
	addr := "/tmp/sample.sock"
  
	conn, err := grpc.Dial(addr, grpc.WithInsecure(),
		grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
			return net.DialTimeout("unix", addr, timeout)
		}))

	if err != nil {
		log.Fatalf("Can't connect: %v", err)
	}

	defer conn.Close()
	c := someProtopb.NewSomeServiceClient(conn)

	if err != nil {
		log.Fatal(err)
	}
}

It took me a while to find out how to do it, hopefully it helps