DevOps Classroomnotes 20/Mar/2022

Activity 1: Lets install Java 11 (openjdk 11)

• Our desired state is to install java 11
• The target os is ubuntu 20.04
• Manual Steps:
  • Refer Here for the steps
  • Commands
    sudo apt update
sudo apt install openjdk-11-jdk
• Lets verify if the manual steps are working correctly or not
  • Lets create a virtual machine
  • Ensure the manual steps are working
  • Please follow the classroom recordings for creating vm and verifying the manual steps
• In Ansible to automate the manual steps, we have two approaches
  • Adhoc command: We execute the automation by building a command ansible -i inventory -m ping all
  • Playbook:
    • We describe our desired state as a Playbook in a YAML File
    • As of now our playbook can be defined as collection of tasks, In Ansible to execute a task we use Ansible Modules.
    • Ansible module is the smallest unit of ansible where we can express our desired state.
    • Structure:
      “`yaml

    </ul>
    <hr />
    <ul>
    <li>name: <description>
    hosts: <hosts from inventory>
    become: <yes/no>
    tasks:<ul>
    <li>name: <description of individual step>
    <module>:
    <parameter-1-name>: <parameter-1-value>
    ..
    <parameter-n-name>: <parameter-n-value></li>
    </ul>
    </li>
    <li>“`

  • For running the playbook we use the command ansible-playbook

Refer Here for the changes done.

Validate the syntax and execute the playbook

Now lets execute the playbook again