Add Dockerfile

Dockerfile

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+FROM       ubuntu:13.10
+MAINTAINER Prometheus Team <prometheus-developers@googlegroups.com>
+
+ENV        COLLECTORS NativeCollector
+RUN        apt-get update && apt-get install -yq curl git mercurial make
+RUN        curl -s https://go.googlecode.com/files/go1.2.linux-amd64.tar.gz | tar -C /usr/local -xzf -
+ENV        PATH    /usr/local/go/bin:$PATH
+ENV        GOPATH  /go
+
+ADD        . /usr/src/node_exporter
+RUN        cd /usr/src/node_exporter && make && cp node_exporter /
+RUN        printf '{ "scrapeInterval": 10, "attributes": {} }' > \
+                  node_exporter.conf
+
+ENTRYPOINT [ "/node_exporter" ]
+EXPOSE     8080