Use bosun.org's mature machine statistics gatherer, scollector (bosun.org/scollector) with prometheus.io's nice slim&sleek Hadoop-free storage.

go get github.com/tgulacsi/prometheus_scollector
prometheus_scollector -http=0.0.0.0:9107
scollector -h=<the-collector-machine>:9107

and don't forget to add a

job: {
	name: "scollector"
	target_group: {
		target: "http://the-collector-machine:9107/metrics"
	}
}

to your prometheus.conf.

I've copied the Dockerfile from Alexey Diyan's github.com/diyan/prom-scollector-exporter-docker - so you can use that directly.