Monitoring

Grafana / Prometheus / Node exporter / ...

• Node exporter
• Prometheus
• Grafana
• InfluxDB

Node exporter

Installation of node exporter

Download the package from the github repository

cd /tmp
wget <link to the last release>
tar xvfz node_exporter-*.*-amd64.tar.gz
sudo mv node_exporter-*.linux-amd64/node_exporter /usr/local/bin/
chmod +x /usr/local/bin/node_exporter
./node_exporter

Then try to get the metrics with a curl command: curl http://localhost:9100/metrics

Create a systemctl task

First create a nonlogin user to run the task

sudo useradd -rs /bin/false node_exporter

Create a systemctl file

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

Past the following in it

[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

Then restart the systemctl daemon, start the task and enable it at system start up

sudo systemctl daemon-reload
sudo systemctl start node_exporter
sudo systemctl enable node_exporter
sudo systemctl status node_exporter

Prometheus

Install Prometheus

First download the source from the web site

wget <link of the source>
tar xvf prometheus-*.*-amd64.tar.gz
mv prometheus-*.*-amd64 prometheus-files

Create an user to run Prometheus and give it the ownership

sudo useradd --no-create-home --shell /bin/false prometheus
sudo mkdir /etc/prometheus
sudo mkdir /var/lib/prometheus
sudo chown prometheus:prometheus /etc/prometheus
sudo chown prometheus:prometheus /var/lib/prometheus

Copy / past the source in the new folder

sudo cp prometheus-files/prometheus /usr/local/bin/
sudo cp prometheus-files/promtool /usr/local/bin/
sudo chown prometheus:prometheus /usr/local/bin/prometheus
sudo chown prometheus:prometheus /usr/local/bin/promtool
sudo cp -r prometheus-files/consoles /etc/prometheus
sudo cp -r prometheus-files/console_libraries /etc/prometheus
sudo chown -R prometheus:prometheus /etc/prometheus/consoles
sudo chown -R prometheus:prometheus /etc/prometheus/console_libraries

Configuration of Prometheus targets

Create a prometheus.yml to setup the config

sudo vim /etc/prometheus/prometheus.yml

Past it the following and change the target ip:port

global:
  scrape_interval: 10s

scrape_configs:
  - job_name: 'prometheus'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:9090']

Then give the ownership to the user previously created

sudo chown prometheus:prometheus /etc/prometheus/prometheus.yml

You can now access to the GUI in your browser

http://<prometheus-ip>:9090/graph

Create a systemctl task

Create the systemctl file

sudo vim /etc/systemd/system/prometheus.service

Past it the following

[Unit]
Description=Prometheus
Wants=network-online.target
After=network-online.target

[Service]
User=prometheus
Group=prometheus
Type=simple
ExecStart=/usr/local/bin/prometheus \
    --config.file /etc/prometheus/prometheus.yml \
    --storage.tsdb.path /var/lib/prometheus/ \
    --web.console.templates=/etc/prometheus/consoles \
    --web.console.libraries=/etc/prometheus/console_libraries

[Install]
WantedBy=multi-user.target

Restart the systemctl daemon, start the task and enable it at system start up

sudo systemctl daemon-reload
sudo systemctl start prometheus
sudo systemctl enable prometheus
sudo systemctl status prometheus

Grafana

InfluxDB