Management Agent can work with any preferred software that exposes metrics in Prometheus format.

In this example, we are using the Prometheus Node Exporter which exposes a wide variety of hardware and kernel-related metrics for UNIX and Linux kernels. For more details about Prometheus Node Exporter, see Node Exporter Github.

To install and run a Node Exporter on a VM, do the following:

1. Download the Node Exporter tar file.

   wget https://github.com/prometheus/node_exporter/releases/download/v*/node_exporter-*.*-amd64.tar.gz

2. Untar the downloaded file.

   tar xvfz node_exporter-*.*-amd64.tar.gz

3. Run Node Exporter on a VM.

   cd node_exporter-*.*-amd64
   ./node_exporter

   The output looks similar to the following:

   INFO[0000] Starting node_exporter (version=0.16.0, branch=HEAD, revision=d42bd70f4363dced6b77d8fc311ea57b63387e4f) source="node_exporter.go:82"
   INFO[0000] Build context (go=go1.9.6, user=root@a67a9bc13a69, date=20180515-15:53:28) source="node_exporter.go:83"
   INFO[0000] Enabled collectors:   source="node_exporter.go:90"
   INFO[0000]  - boottime           source="node_exporter.go:97"
   ...
   INFO[0000] Listening on :9100 source="node_exporter.go:111" 

   The above indicates the Node Exporter is running and exposing metrics on the default port: 9100.

4. Verify Node Exporter installation.
   To verify that the metrics are being exported, use the following:

   http://localhost:9100/metrics

   The output looks similar to the following:

   

   Another way to verify the installation is to run curl from the command line on the same endpoint like the following:

   curl http://localhost:9100/metrics

   The output looks similar to the following:

   # Output:
   
   # HELP node_cpu_seconds_total Seconds the CPUs spent in each mode.
   # TYPE node_cpu_seconds_total counter
   node_cpu_seconds_total{cpu="0",mode="idle"} 485489.29
   node_cpu_seconds_total{cpu="0",mode="iowait"} 356.55
   node_cpu_seconds_total{cpu="0",mode="irq"} 0.05
   node_cpu_seconds_total{cpu="0",mode="nice"} 6.02
   node_cpu_seconds_total{cpu="0",mode="softirq"} 1.44
   node_cpu_seconds_total{cpu="0",mode="steal"} 156.66
   node_cpu_seconds_total{cpu="0",mode="system"} 1241.91
   node_cpu_seconds_total{cpu="0",mode="user"} 4513.21
   node_cpu_seconds_total{cpu="1",mode="idle"} 485151.18
   node_cpu_seconds_total{cpu="1",mode="iowait"} 485.2