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Prometheus is a monitoring platform that collects the metrics of the machines on which it is installed, "scraping" the parameters from the HTTP endpoints of the latter.

Installation

We present a procedure that establishes the service using Docker-compose. Obviously, Docker-compose must be present on the system (if not present in your system install docker-compose).

We create a folder (eg "mkdir prometheus") in which we insert the docker-compose.yml file

Panel
titledocker-compose.yml
version: '3'

services:

  prometheus:
    image: prom/prometheus
    container_name: prometheus
    ports:
      - 90:9090
    restart: always
    user: '1000'
    volumes:
      - "$PWD/promdata:/prometheus"
      - "$PWD/promconf:/etc/prometheus:ro"
    command: "--config.file=/etc/prometheus/prometheus.yml --storage.tsdb.retention=90d"
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"

Always inside the prometheus folder we create 2 other folders, called promconf and promdata, where we will insert, respectively, our configurations, present in the prometheus.yml file, and storage. The latter allows you to configure Prometheus to monitor itself. The just mentioned configuration file is

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titleprometheus.yml
global:
  scrape_interval: 15s # By default, scrape targets every 15 seconds.

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

# 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

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

Prometheus collects metrics of monitored targets by scraping the HTTP endpoints of these targets. Since Prometheus himself exposes his internal metrics through the same mechanism, it is possible to scrape and monitor his health through the same mechanism.