Convert app to use Compose file 2

Signed-off-by: Ben Firshman <ben@firshman.co.uk>

README.md

@@ -1,7 +1,7 @@
 Example Voting App
 ==================
 
-This is an example Docker app with multiple services. It is run with Docker Compose and uses Docker Networking to connect containers together.
+This is an example Docker app with multiple services. It is run with Docker Compose and uses Docker Networking to connect containers together. You will need Docker Compose 1.6 or later.
 
 More info at https://blog.docker.com/2015/11/docker-toolbox-compose/
 
@@ -20,7 +20,7 @@ Running
 Since this app makes use of Compose's experimental networking support, it must be started with:
 
     $ cd vote-apps/
-    $ docker-compose --x-networking up -d
+    $ docker-compose up -d
 
 The app will be running on port 5000 on your Docker host, and the results will be on port 5001.
 

vote-apps/docker-compose.yml

@@ -1,25 +1,36 @@
-voting-app:
+version: "2"
+services:
+  voting-app:
     build: ./voting-app/.
     volumes:
       - ./voting-app:/app
     ports:
       - "5000:80"
+    links:
+      - redis
 
-redis:
+  redis:
     image: redis
     ports: ["6379"]
 
-worker:
+  worker:
     build: ./worker
+    links:
+      - db
+      - redis
 
-db:
+  db:
     image: postgres:9.4
     volumes:
       - "myvolume:/var/lib/postgresql/data"
 
-result-app:
+  result-app:
     build: ./result-app/.
     volumes:
       - ./result-app:/app
     ports:
       - "5001:80"
+    links:
+      - db
+volumes:
+  myvolume:

vote-apps/result-app/server.js

@@ -24,7 +24,7 @@ io.sockets.on('connection', function (socket) {
 async.retry(
   {times: 1000, interval: 1000},
   function(callback) {
-    pg.connect('postgres://postgres@voteapps_db_1/postgres', function(err, client, done) {
+    pg.connect('postgres://postgres@db/postgres', function(err, client, done) {
       if (err) {
         console.error("Failed to connect to db");
       }

vote-apps/voting-app/app.py

@@ -12,7 +12,7 @@ option_a = os.getenv('OPTION_A', "Cats")
 option_b = os.getenv('OPTION_B', "Dogs")
 hostname = socket.gethostname()
 
-redis = connect_to_redis("voteapps_redis_1")
+redis = connect_to_redis("redis")
 app = Flask(__name__)
 
 

vote-apps/worker/src/main/java/worker/Worker.java

@@ -8,8 +8,8 @@ import org.json.JSONObject;
 class Worker {
   public static void main(String[] args) {
     try {
-      Jedis redis = connectToRedis("voteapps_redis_1");
-      Connection dbConn = connectToDB("voteapps_db_1");
+      Jedis redis = connectToRedis("redis");
+      Connection dbConn = connectToDB("db");
 
       System.err.println("Watching vote queue");