How to install Node Exporter on CentOS 7 - Linux Monitoring

Prometheus is a complete monitoring and trending system with built-in and active scraping, storing, querying, graphing and alerting based on time series data.

First, you need to configure Prometheus node exporter on a Linux server.

Download & configure Node Exporter

Copy URL of the Node Exporter from the official download page, or this link for version 1.2.2.linux-amd64.

Paste the copied URL after wget in the following command:

$ wget https://github.com/prometheus/node_exporter/releases/download/v1.2.2/node_exporter-1.2.2.linux-amd64.tar.gz

Extract the downloaded package:

$ tar -xzvf node_exporter-1.2.2.linux-amd64.tar.gz

Create a user for the node exporter:

$ sudo useradd -rs /bin/false nodeusr

Move binary to “/usr/local/bin” from the extracted package:

$ sudo mv node_exporter-1.2.2.linux-amd/node_exporter /usr/local/bin/

Create a system service fil for the node exporter:

$ sudo 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 & exit file.

Reload the system daemon:

$ sudo systemctl daemon-reload

Enable boot-up system service auto-start after rebooting:

$ sudo systemctl enable node_exporter

Add a firewall rule to allow node exporter:

$ sudo firewall-cmd --zone=public --add-port=9100/tcp --permanent

Reload firewall service:

$ sudo systemctl restart firewalld

View the metrics browsing node explorer URL:

http://IP-Address:9100/metrics

Add target to Prometheus YAML configuration file

Add configured node exporter target on Prometheus Server.

Login to Prometheus server and modify the prometheus.yml file

Edit the file:

$ sudo vim /etc/prometheus/prometheus.yml

Add the following configurations under the scrape config.

 - job_name: 'node_exporter_centos'
    scrape_interval: 5s
    static_configs:
      - targets: ['10.94.10.209:9100']
 

Restart Prometheus service:

$ sudo 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.