Small enhancements to the example app

- Explicity add go app to the example container, so it fails if you haven't built it.
- spin up 2 goapps and 3 elastic searches

experimental/example/Makefile

@@ -10,7 +10,7 @@ qotd/qotd: qotd/qotd.o
 	gcc -o $@ $< $(CFLAGS)
 
 goapp/app: goapp/app.go
-	go build -o goapp/app ./goapp
+	go build -ldflags "-extldflags \"-static\"" -tags netgo -o goapp/app ./goapp
 
 clean:
 	rm -f qotd/*.o qotd/qotd goapp/app

experimental/example/docker-compose.yml

@@ -10,20 +10,30 @@ pyapp:
   links:
     - qotd
     - redis
-    - goapp
+    - goapp1
+    - goapp2
 qotd:
   build: qotd
   expose:
     - "4446"
 redis:
   image: redis
-goapp:
+goapp1:
   build: goapp
   ports:
     - "8080"
   links:
     - elasticsearch1
     - elasticsearch2
+    - elasticsearch3
+goapp2:
+  build: goapp
+  ports:
+    - "8080"
+  links:
+    - elasticsearch1
+    - elasticsearch2
+    - elasticsearch3
 elasticsearch1:
   image: elasticsearch
   expose:
@@ -36,3 +46,11 @@ elasticsearch2:
     - "9300"
   links:
     - elasticsearch1
+elasticsearch3:
+  image: elasticsearch
+  expose:
+    - "9200"
+    - "9300"
+  links:
+    - elasticsearch1
+    - elasticsearch2

experimental/example/goapp/Dockerfile

@@ -1,5 +1,5 @@
 FROM gliderlabs/alpine
 MAINTAINER Weaveworks Inc <help@weave.works>
 WORKDIR /home/weave
-ADD . /home/weave/
+ADD app entrypoint.sh /home/weave/
 ENTRYPOINT ["/home/weave/entrypoint.sh"]

experimental/example/goapp/entrypoint.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-exec /home/weave/app elasticsearch1 elasticsearch2
+exec /home/weave/app elasticsearch1 elasticsearch2 elasticsearch3