Merge pull request #12223 from thockin/srv-hostname

contrib/for-demos/serve_hostname/Dockerfile

-FROM scratch
+FROM busybox
 MAINTAINER Tim Hockin <thockin@google.com>
 ADD serve_hostname /serve_hostname
 ADD serve_hostname.go /serve_hostname.go

contrib/for-demos/serve_hostname/Makefile

 all: serve_hostname
 
-TAG = 1.1
+TAG = v1.2
+PREFIX = gcr.io/google_containers
+TEST_PREFIX = gcr.io/_b_k8s_authenticated_test
 
 serve_hostname: serve_hostname.go
 	CGO_ENABLED=0 go build -a -installsuffix cgo --ldflags '-w' ./serve_hostname.go
 
 container: serve_hostname
-	sudo docker build -t gcr.io/google_containers/serve_hostname:$(TAG) .
-	sudo docker tag gcr.io/google_containers/serve_hostname:$(TAG) gcr.io/_b_k8s_authenticated_test/serve_hostname:$(TAG)
+	docker build -t $(PREFIX)/serve_hostname:$(TAG) .
+	if [ -n "$(TEST_PREFIX)" ]; then \
+	    docker tag -f $(PREFIX)/serve_hostname:$(TAG) $(TEST_PREFIX)/serve_hostname:$(TAG); \
+	fi
 
 push:
-	gcloud docker push gcr.io/google_containers/serve_hostname:$(TAG)
-	gcloud docker push gcr.io/_b_k8s_authenticated_test/serve_hostname:$(TAG)
+	gcloud docker push $(PREFIX)/serve_hostname:$(TAG)
+	if [ -n "$(TEST_PREFIX)" ]; then \
+	    gcloud docker push $(TEST_PREFIX)/serve_hostname:$(TAG); \
+	fi
 
 clean:
 	rm -f serve_hostname

contrib/for-demos/serve_hostname/serve_hostname.go

@@ -56,6 +56,7 @@ func main() {
 				if err != nil {
 					log.Fatalf("Error from Accept(): %s", err)
 				}
+				log.Printf("TCP request from %s", conn.RemoteAddr().String())
 				conn.Write([]byte(hostname))
 				conn.Close()
 			}
@@ -77,12 +78,16 @@ func main() {
 				if err != nil {
 					log.Fatalf("Error from ReadFrom(): %s", err)
 				}
+				log.Printf("UDP request from %s", cliAddr.String())
 				sock.WriteTo([]byte(hostname), cliAddr)
 			}
 		}()
 	}
 	if *doHttp {
-		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "%s", hostname) })
+		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+			log.Printf("HTTP request from %s", r.RemoteAddr)
+			fmt.Fprintf(w, "%s", hostname)
+		})
 		go log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", *port), nil))
 	}