Using the Node Exporter on Amazon Linux, CentOS & RHEL

Create a system user:

$ sudo useradd --no-create-home --shell /bin/false node_exporter

Download the Node Exporter from Prometheus’s download page:

$ cd /tmp/
$ wget https://github.com/prometheus/node_exporter/releases/download/v0.17.0/node_exporter-0.17.0.linux-amd64.tar.gz

Extract its contents; note that the versioning of the Node Exporter may be different:
```
 $ tar -xvf node_exporter-0.17.0.linux-amd64.tar.gz
```
Move into the newly created directory:
```
$ cd node_exporter-0.17.0.linux-amd64/
```
Move the provided binary:
```
$ sudo mv node_exporter /usr/local/bin/
```

Set the ownership:

$ sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

Create a systemd service file:

$ sudo vim /etc/systemd/system/node_exporter.service

[Unit]
Description=Node Exporter
After=network.target

[Service]
User=node_exporter
Group=node_exporter
Type=simple
ExecStart=/usr/local/bin/node_exporter

[Install]
WantedBy=multi-user.target

Save and exit when done.

Start the Node Exporter:

$ sudo systemctl daemon-reload
$ sudo systemctl start node_exporter

Add the endpoint to the Prometheus configuration file:

$ sudo $EDITOR /etc/prometheus/prometheus.yml

- job_name: 'nodeexporter'
  static_configs:
  - targets: ['localhost:9100']

Restart Prometheus:
```
$ sudo systemctl restart prometheus
```
Navigate to the Prometheus web UI. Using the expression editor, search for cpu, meminfo, and related system terms to view the newly added metrics.
Search for node_memory_MemFree_bytes in the expression editor; shorten the time span for the graph to be about 30 minutes of data.
Back on the terminal, download and run stress to cause some memory spikes:
```
$ sudo apt-get install stress
$ stress -m 2
```
Wait for about one minute, and then view the graph to see the difference in activity.

Using the Node Exporter on Amazon Linux, CentOS & RHEL

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