add Dockerfile, docker-compose.yml. updated examples/cluster document…

…ation

closes #49

Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.9-alpine  
+
+RUN apk update && apk upgrade && \
+    apk add --no-cache bash git openssh make
+
+RUN go get -u github.com/kardianos/govendor 
+ADD . /go/src/github.com/travisjeffery/jocko
+WORKDIR /go/src/github.com/travisjeffery/jocko
+RUN govendor sync
+RUN govendor test -v -p=1 +local
+RUN go build -o jocko cmd/jocko/main.go
+RUN go build -o createtopic cmd/createtopic/main.go
+
+FROM alpine:latest
+
+COPY --from=0 /go/src/github.com/travisjeffery/jocko/jocko /usr/local/bin/jocko
+COPY --from=0 /go/src/github.com/travisjeffery/jocko/createtopic /usr/local/bin/createtopic
+
+EXPOSE 9092 9093 9094
+
+VOLUME "/tmp/jocko"
+
+CMD ["jocko"]

docker-compose.yml

@@ -0,0 +1,14 @@
+version: '3'
+
+services:
+
+  jocko_main:
+    build:
+      context: .
+    image: jocko
+
+  jocko_cluster:
+    build:
+      context: .
+    image: jocko
+    command: jocko --serfmembers=jocko_main:9094

examples/cluster/README.md

@@ -39,3 +39,7 @@ $ ./jocko broker \
           --serfmembers=127.0.0.1:9003 \
           --id=3
 ```
+
+## docker-compose cluster
+
+To start a [docker compose](https://docs.docker.com/compose/) cluster node use the provided `/docker-compose.yml`.