Initial dockerfile

Dockerfile

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+FROM ubuntu:14.04
+MAINTAINER Vaibhav Bhembre <vaibhav@digitalocean.com>
+
+ENV GOPATH /go
+ENV APPLOC $GOPATH/src/github.com/digitalocean/ceph_exporter
+
+RUN apt-get update && \
+    apt-get install build-essential
+    apt-get install -y librados-dev librbd-dev
+
+WORKDIR $APPLOC
+RUN go get -d && \
+    go build -o /bin/ceph_exporter && \
+    rm -rf $GOPATH
+
+ENTRYPOINT ["/bin/ceph_exporter"