Deprecate hellonode, add hello-app sample

hello-app/Dockerfile

@@ -0,0 +1,8 @@
+FROM golang:1.8-alpine
+ADD . /go/src/hello-app
+RUN go install hello-app
+
+FROM alpine:latest
+COPY --from=0 /go/bin/hello-app .
+ENV PORT 8080
+CMD ["./hello-app"]

hello-app/README.md

@@ -0,0 +1,14 @@
+# Hello Application example
+
+This example shows how to build and deploy a containerized Go web server
+application using [Kubernetes](https://kubernetes.io).
+
+Visit https://cloud.google.com/container-engine/docs/tutorials/hello-app
+to follow the tutorial and deploy this application on [Google Container
+Engine](https://cloud.google.com/container-engine).
+
+This directory contains:
+
+- `main.go` contains the HTTP server implementation. It responds to all HTTP
+  requests with a  "Hello, world!" response.
+- `Dockerfile` is used to build the Docker image for the application.

hello-app/main.go

@@ -0,0 +1,42 @@
+/**
+ * Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	port := "8080"
+	if fromEnv := os.Getenv("PORT"); fromEnv != "" {
+		port = fromEnv
+	}
+
+	server := http.NewServeMux()
+	server.HandleFunc("/", hello)
+	log.Printf("Server listening on port %s", port)
+	log.Fatal(http.ListenAndServe(":"+port, server))
+}
+
+func hello(w http.ResponseWriter, r *http.Request) {
+	log.Printf("Serving request: %s", r.URL.Path)
+	host, _ := os.Hostname()
+	fmt.Fprintf(w, "Hello, world!\n")
+	fmt.Fprintf(w, "Hostname: %s\n", host)
+}

hellonode/README.md

@@ -1,7 +1,4 @@
 # Hello Node example
 
-This example shows how to build a containerized Node.js application using
-Kubernetes and Docker.
-
-Visit https://cloud.google.com/container-engine/docs/tutorials/hello-node
-to follow the tutorial to deploy this application on Google Container Engine.
+**This example has been replaced with `hello-app`. See [here](../hello-app) to
+follow the tutorial with the new sample application.**