Dockerize word_count example

Dockerfile

@@ -0,0 +1,10 @@
+FROM scratch
+
+
+COPY glow /
+
+EXPOSE 8930
+VOLUME ["/data"]
+
+ENTRYPOINT ["/glow"]
+CMD [""]

README.md

@@ -98,6 +98,18 @@ To understand how each executor works, you can visualize the flow by generating
 
 ![Glow Hello World Execution Plan](https://raw.githubusercontent.com/chrislusf/glow/master/etc/helloworld.png)
 
+## Docker container
+
+### OSX
+Cross compile artefact for docker
+```
+GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build .
+```
+Build container
+```
+docker build -t glow .
+```
+See `examples/` directory for docker-compose setups.
 
 # Read More
 

examples/word_count/.gitignore

@@ -0,0 +1 @@
+work/

examples/word_count/Dockerfile

@@ -0,0 +1,7 @@
+FROM scratch
+
+
+COPY word_count /
+
+ENTRYPOINT ["/word_count"]
+CMD [""]

examples/word_count/README.md

@@ -0,0 +1,20 @@
+# Word count example
+
+## Setup via docker-compose
+* See [README](http://../../README.md#docker-container) to build `glow` docker image.
+* 
+
+### OSX
+Cross compile artefact for docker
+```
+GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build .
+```
+Build container with `word_count` tag
+```
+docker build -t word_count .
+```
+
+Start containers via [docker-compose](https://docs.docker.com/compose/)
+```
+docker-compose up
+```

examples/word_count/docker-compose.yml

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+agent1:
+  read_only: true
+  image: glow
+  command: agent --dir /data --max.executors=2 --memory=768 --master="master:8930" --port 8931
+  expose:
+    - "8931"
+  links: 
+    - master
+  volumes:
+    - ./work/agent1:/data
+    - ./README.md:/etc/passwd
+
+agent2:
+  read_only: true
+  image: glow
+  command: agent --dir /data --max.executors=2 --memory=768 --master="master:8930" --port 8932
+  expose:
+    - "8932"
+  links:
+    - master
+  volumes:
+    - ./work/agent2:/data
+    - ./README.md:/etc/passwd
+
+master:
+  read_only: true
+  image: glow
+  command: master --ip 0.0.0.0
+  expose:
+    - "8930"
+
+word_count:
+  image: word_count
+  command: -glow -test 1 -glow.leader="master:8930"
+  links:
+    - master
+    - agent1
+    - agent2
+  volumes:
+    - ./README.md:/etc/passwd