Prometheus - Monitoring system & time series database

Prometheus is an open-source monitoring and alerting toolkit.

Installation

Prometheus as two components, Server and Exporter.

Server : scrapes (pull) metrics from targets. It as its own database under /var/lib/prometheus/metrics2
Exporter : exposes metrics to client, like grafana, etc...

Since prometheus is in Debian repository, just install with:

sudo apt-get install prometheus prometheus-node-exporter

Configuration

Add targets into configuration /etc/prometheus/prometheus.yml.

scrape_configs:
  - job_name: 'server_label'
    static_configs:
      - targets: ['server_hostname:9100']

You can install config file sample with.

sudo cp /usr/share/doc/prometheus/examples/consoles/* /etc/prometheus/consoles
sudo mv /etc/prometheus/consoles/index.html.example /etc/prometheus/consoles/index.html
sudo cp /usr/share/doc/prometheus/examples/console_libraries/* /etc/prometheus/console_libraries
sudo gunzip /etc/prometheus/console_libraries/*.gz

Adapt the files

References

Tincho's talk: https://summit.debconf.org/debconf15/meeting/312/rethinking-monitoring-with-prometheus/