To capture metrics from a Linux server, we will install node-exporter and ingest data into prometheus.
Download the latests node-exporter version and extract it:
$ cd ~
$ wget https://github.com/prometheus/node_exporter/releases/download/v1.5.0/node_exporter-1.5.0.linux-amd64.tar.gz
$ tar -xzf node*
$ rm *.tar.gz
Create the node_exporter user, move the new files, and change ownership of them to this user:
$ sudo groupadd --system node_exporter
$ sudo useradd -s /sbin/nologin --system -g node_exporter node_exporter
$ sudo mv node_exporter*/* /usr/local/bin
$ sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter
$ rm -rf ./node_exporter-*
Next, we will create a systemd service:
$ sudo nano /etc/systemd/system/node_exporter.service
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target
[Service]
User=node_exporter
Group=node_exporter
Type=simple
ExecStart=/usr/local/bin/node_exporter
[Install]
WantedBy=multi-user.target
Then start and enable the service"
$ sudo systemctl daemon-reload
$ sudo systemctl enable --now node_exporter
Modify the prometheus configuration file and make sure that the router we want to monitor is in the targets list:
$ sudo nano /etc/prometheus/prometheus.yml
...
- job_name: 'node'
scrape_interval: 5s
static_configs:
- targets: ['127.0.0.1:9100']
Now validate the configuration and restart prometheus:
$ promtool check config /etc/prometheus/prometheus.yml
Checking /etc/prometheus/prometheus.yml
SUCCESS: /etc/prometheus/prometheus.yml is valid prometheus config file syntax
$ sudo systemctl restart prometheus
In Grafana, use the left navigation to go to Dashboard --> Import.
On the Import Dashboard page, enter https://grafana.com/grafana/dashboards/1860-node-exporter-full/ in the Import via grafana.com field and press the button for Load.
After loading the dashboard, be sure to select grafanacloud-philtel-prom under the Prometheus dropdown and press the Import button.
The dashboard will now load automatically.