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Prometheus Node-Exporter Grafana deployment using Ansible roles

Prometheus is an open-source monitoring system which is very lightweight and has a good alerting mechanism. Prometheus can monitor hundreds of instances and display metrics and statistics from all of them to you in one simple dashboard.

Grafana is a web application that gives you visualization tools. In a nutshell, we will be able to create and use dashboards from Grafana to visualize all the statistics and metrics presented by Prometheus.

Project Scope

In this demo, we will be creating an Ansible playbook to automate the installation of grafana, node_exporter, and Prometheus into an EC2 instance. Here, we will be making use of ansible roles to deploy each components.

Architecture

This is a monitoring project which consists of the following components:

  • Node Exporter : Node exporter produces metrics about infrastructure which include CPU, memory, disc, network stats etc.
  • Prometheus : It helps monitor servers which are called targets. It can be a single target or multiple targets monitored for different metrics.
  • Grafana : Is a tool for visualising the metrics by connecting with the prometheus server.

In this module, we will see how each of these components can be automatically deployed using ansible playbook.

image

We will be deploying this project using 3 instances.

  • In the first instance, we will be setting this up as a monitoring server in which we will be installing prometheus(port:9090) and Grafana(port:3000) application. This instance connects to other 2 instances and reads the metrices like cpu usage,memory, stats etc in a timely manner.

  • In the other 2 nodes, we will be setting up the node exporter which will be working on port 9100.

Requirements

  • Install Ansible on your machine (ansible master).
  • Ansible-galaxy
  • 3 instances for installing node exporter, prometheus and grafana applications.
  • community.grafana (auto configure grafana with prometheus)
ansible-galaxy collection install community.grafana

Variables used

02-prometheus.main.yml

node and grafana instance or server IPs.

- node_ip: "172.31.38.242"
- grafana_ip: "172.31.38.234"

role/grafana/vars/main.yml

grafana dashboard admin login details

grafana_user: admin
grafana_password: admin123

role/node-exporter/vars/main.yml

binary for node-exporter

url_node_exporter: "https://github.com/prometheus/node_exporter/releases/download/v1.3.1/node_exporter-1.3.1.linux-amd64.tar.gz"

Provisioning

Clone the files and place the role under /etc/ansible/role/ (confirm the roles_path under the ansible conf file)

git clone https://github.com/Jisjo/ansible_prometheus-installation_role.git

We can run the playbooks using the command

ansible-playbook -i hosts 01-node-exporter-main.yml 
ansible-playbook -i hosts 02-prometheus.main.yml

Result

Grafana: http://ip_address:3000

screenshot

prometheus: http://ip_address:9090

image