DevOps Classroom notes 27/Feb/2024

Ansible contd

Activity 3 : Installing php on apache

• Refer Here for manual steps
• Note: we will be skipping mysql.
• Manual steps for ubuntu

sudo apt update
sudo apt install apache2 -y
sudo systemctl enable apache2
sudo systemctl start apache2
sudo apt install php libapache2-mod-php php-mysql
sudo systemctl restart apache2

# create a file in /var/www/html/info.php with content <?php phpinfo(); ?>
sudo systemctl restart apache2

• Lets write a playbook for this.
• Refer Here for the first version of playbook with inventory and variables added.
• Ansible handlers Refer Here
• Refer Here for the changes in inventory and variables
  
  

Ansible inventory

• Inventory is list of hosts
• Inventory consists of groups and hosts
• Inventory can be written in two formats
  • ini
  • yaml
• ini

[group-1]
host-1
host-2

[group-2]
host-3
host-4

[experiment-group]
host-1
host-3

• Yaml

---
group-1:
  hosts:
    host-1:
    host-2
group-2
  hosts:
    host-3
    host-4
experiment-group:
  hosts:
    host-1
    host-3

• we have a host where we need to add a variable package with value apache2
• in ini format

[webservers]
192.168.0.11 package=apache2

• in yaml format

---
webservers:
  hosts:
    192.168.0.11:
      package=apache2

*

Ansible variables

• Ansible variables can be created in different locations
  • inventory:
    • directly in inventory
    • relative to inventory
  • playbook
  • pass variables during execution