DevOps Tools/Prometheus/Exporter

Overview | Prometheus Server | Prometheus Node Exporter

Overview

Metric collector. The prometheus server will have ingress connections to each of the node exporters in order to scrape a file that is hosted on each node exporter.

CentOS7 Installation

Create dependencies

~$ sudo yum install -y wget curl
~$ sudo groupadd --system prometheus
~$ sudo useradd -s /sbin/nologin --system -g prometheus prometheus

Download and setup

~$ curl -s https://api.github.com/repos/prometheus/node_exporter/releases/latest | grep browser_download_url | grep linux-amd64 | cut -d '"' -f 4 | wget -qi -
~$ tar xvf node_exporter*.tar.gz
~$ cd node_exporter*/
~$ sudo cp node_exporter /usr/local/bin

Setup Firewall rules

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

Create systemd service

~$ sudo vim /etc/systemd/system/node-exporter.service

 [Expand] 

systemd service

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

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

[Install]
WantedBy=multi-user.target

~$ sudo systemctl daemon-reload
~$ sudo systemctl start node-exporter
~$ sudo systemctl enable node-exporter

Test

Test connection to the server running Prometheus Node Exporter on port 9100