Prometheus

Overview

This installation happens on the dsb-node-01.

According to Prometheus' Website, Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. It is designed for reliability and scalability, collecting metrics from configured targets at given intervals, evaluating rule expressions, displaying the results, and triggering alerts if needed. This guide will walk you through the steps to install and configure Prometheus using Docker Compose on your system.

Prerequisites

1. Install Docker

   • Install Docker using Snap:

     sudo snap install docker

2. Create Docker Group and Add User to It

   • Create a Docker group and add your user to it:

     sudo groupadd docker
     sudo usermod -aG docker $USER
     sudo reboot

Installation Steps

1. Create a Docker-Compose File for Prometheus

• Create the necessary directories and Docker Compose file:

  mkdir -p ~/apps/prometheus
  touch ~/apps/prometheus/docker-compose.yml

2. Copy and Save the Docker-Compose Configuration

• Use the following configuration in your docker-compose.yml file:

  version: '3.7'
  
  services:
    prometheus:
      image: prom/prometheus:latest
      container_name: prometheus
      volumes:
        - prometheus_data:/prometheus
        - ./prometheus.yml:/etc/prometheus/prometheus.yml
      ports:
        - "9090:9090"
      restart: always
      network_mode: host
  
  volumes:
    prometheus_data:

• Open the file with nano or your preferred text editor and paste the configuration:

  nano ~/apps/prometheus/docker-compose.yml

• Save and close the file.

3. Create a Custom prometheus.yml File

• Create the prometheus.yml file in the Prometheus directory:

  touch ~/apps/prometheus/prometheus.yml

• Add the following configuration to the prometheus.yml file:

  global:
    scrape_interval: 15s
    evaluation_interval: 15s
  
  scrape_configs:
   - job_name: 'cadvisor'
     static_configs:
       - targets: ['localhost:8080']
  
   - job_name: 'node_exporter'
     static_configs:
       - targets: ['localhost:9100']
  
   - job_name: 'jenkins'
     metrics_path: /prometheus/
     static_configs:
       - targets: ['<your_ip_address>:8080']

  NOTE: This configuration sets up Prometheus to scrape metrics from cAdvisor, Node Exporter, and Jenkins. Replace <your_ip_address> with the actual IP address of your Jenkins server.

4. Run Prometheus with Docker-Compose

• Navigate to the Prometheus directory and run the container:

  cd ~/apps/prometheus
  docker-compose up -d

5. Confirm Prometheus is Running

• Check if Prometheus is up and running by visiting http://localhost:9090 in your web browser.

  

You're Done

You’ve successfully installed and configured Prometheus on your system. Your Prometheus server is now up and running, ready to scrape metrics from the configured targets and provide insights into your system’s performance and health.