Prometheus-grafana¶

Prometheus est une supervision client / serveur.
Le serveur est consultable sous localhost:9093
Les clients produisent une page localhost:9100 que le serveur écoute
Prometheus est sous licence Apache 2 . Les sources sont disponibles sous github .

Prometheus existe aussi sous la forme de paquets pour debian10, ce que nous allons utiliser.

Serveur Prometheus¶

Installation¶

/etc/apt/sources.list

deb https://packages.grafana.com/enterprise/deb stable main

Il est nécessaire d'ajouter la clef gpg pour ce dépôt.

gpg --receive-key 8C8C34C524098CB6
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8C8C34C524098CB6
apt update
apt install grafana-enterprise

Configuration¶

La configuration se fait via un fichier yaml. Ici un exemple.
/etc/prometheus/prometheus.yml

# Sample config for Prometheus.

global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
  external_labels:
      monitor: 'example'

# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets: ['localhost:9093']

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # Override the global default and scrape targets from this job every 5 seconds.
    scrape_interval: 5s
    scrape_timeout: 5s

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ['localhost:9090']

  - job_name: Mes_machines_virtuelles
    static_configs:
      - targets: 
        - 'domaine.associe.ou.adresse.ip:9100'
        - 'XXX.XXX.XXX.XXX:9100'


  - job_name: noeud_pour_autres_machines
    # If prometheus-node-exporter is installed, grab stats about the local
    # machine by default.
    static_configs:
        # première syntaxe yaml
        #- targets: ['localhost:9100']
        # deuxième syntaxe yaml
      - targets: 
        - 'localhost:9100' # la machine qui s'écoute
        - 'XXX.XXX.XXX.XXX:9100'
        - 'YYY.YYY.YYY.YYY:9100'

Lancement¶

systemctl start grafana-server

Ou pour relancer

systemctl reload prometheus