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