Node Exporter is a Prometheus exporter for server level and OS level metrics with configurable metric collectors. It helps us in measuring various server resources such as RAM, disk space, and CPU utilization.
Go to the site Prometheus.io/download copy the package of node_exporter
wget https://github.com/prometheus/node_exporter/releases/download/v1.0.0/node_exporter-1.0.0.linux-amd64.tar.gz
Extract the downloaded package.
tar -xvzf node_exporter-1.0.0.linux-amd64.tar.gz
Create a user for the node exporter.
useradd -rs /bin/false nodeusr
Move binary to “/usr/local/bin” from the downloaded extracted package.
mv node_exporter-1.0.0.linux-amd64/node_exporter /usr/local/bin/
Create a service file for the node exporter.
vim /etc/systemd/system/node_exporter.service
Add the following content to the file.
[Unit]
Description=Node Exporter
After=network.target
[Service]
User=nodeusr
Group=nodeusr
Type=simple
ExecStart=/usr/local/bin/node_exporter
[Install]
WantedBy=multi-user.target
Save and exit the file.
Reload the system daemon.
systemctl daemon-reload
Start node exporter service.
systemctl start node_exporter
Enable node exporter on system boot.
systemctl enable node_exporter
use this URL to see the metrics
http://IP-Address:9100/metrics
Then you will see this window:-
Add configured node exporter Target On Prometheus Server.
Login to Prometheus server and modify the prometheus.yml file
Edit the file:
vim /etc/prometheus/prometheus.yml
Add the following configurations under the scrape config.
– job_name: ‘node_exporter_centos’
scrape_interval: 5s
static_configs:
– targets: [‘node_exporter-ip-addr:9100’]
The file should look like as follows.
Restart Prometheus service.
systemctl restart prometheus
Login to Prometheus server web interface, and check targets.
http://Prometheus-Server-IP:9090/targets
You can click the graph and query any server metrics and click execute to show output. It will show the console output.
Query Browser:
Console output:
Click on graph to view:
