DevOps Classroom Series – 23/Dec/2020


  • In Ansible inventories are list of nodes
  • Inventories can be static or dynamic
  • Inventories can be written in two formats in static
    • INI
    • YAML
  • Inventory orderding: A new play level keyword called as order is added which supports the following values
    • inventory: This is default. It simply means Ansible will execute the order in the way they are written in inventory
    • reverse_inventory
    • sorted: hosts are alphabetically sorted
    • reverse_sorted: hosts are reverse alphabetically sorted
    • shuffle


  • In Inventories entries can be grouped together



  • In any inventory ansible will have two default groups
    • all: This is list of the nodes (unique)
    • ungrouped: This is list of the nodes which donot belong to any group.

Ansible Inventory Scenarios

  • Scenario-1:

    • Install utility Softwares like git, tree and nano on all machines
      • manual steps:
        • ubuntu sudo apt install git tree nano -y
        • rhel sudo yum install git tree nano -y
      • In ansible we have a generic package module Refer Here.
      • Refer Here for the changes
    • Install apache on centos
      • manual steps:
      sudo yum install httpd
      sudo systemctl enable httpd
      sudo systemctl start httpd
    • Install java on ubuntu
  • As of now we have two nodes

    • node-1: ubuntu
    • node-2: centos
  • Scenario 2: Install Lamp stack on webservers. In web servers we have ubuntu and centos nodes. Try Creating one playbook for this.

    • ubuntu: manual steps
      • sudo apt update
      • sudo apt install apache2 -y
      • sudo apt install php libapache2-mod-php php-mysql php-cli -y
      • echo "<?php phpinfo(); ?>" > /var/www/html/info.php
    • centos: manual steps
      • sudo yum install httpd -y
      • sudo systemctl enable httpd.service
      • sudo systemctl start httpd.service
      • sudo yum install php php-mysql php-fpm -y
      • echo "<?php phpinfo(); ?>" > /var/www/html/info.php

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