DevOps Classroom notes 04/Mar/2025

Ansible setup on Azure

• Watch classroom recording

Ansible Terms

• In Ansible to perform configuration management we write playbooks or build adhoc commands
• Playbook based approach is preferred for repetitive tasks
• Ansible playbook for now can be called as a way of expressing desired state which has the following structure
  
• Playbook is collection of play’s & each play will have tasks which define the desired state

---
- name: update os packages and install apache
  become: yes
  hosts: all
  tasks:
    - name: update packages
      ansible.builtin.apt:
        name: apache2
        update_cache: yes
        state: present

- name: install utilities
  become: yes
  hosts: all
  tasks:
    - name: update utils
      ansible.builtin.apt:
        name: 
          - git
          - tree
        update_cache: yes
        state: present

YAML

• Ansible playbook are written in yaml format.
• YAML is collection of name value (key value) pairs
• YAML was designed to be both machine readable as well as human readable
• each key value syntax <key>: <value>
• yaml

<key1>: <value1>
<key2>: <value2>
..
<keyn>: <valuen>

• values are of multiple types
  • text: the value can be with or without quotes. quotes can be single or double
    yaml
course: DevOps
course: 'DevOps'
course: "DevOps"
  • number
    yaml
age: 15
age: 15.1
  • boolean
    yaml
online: True
online: yes
online: False
online: no
  • list: this is used to represent multiple items
    “`yaml
    languages: ["english", "hindi", "telugu"]
    languages:</li>
    <li>english</li>
    <li>hindi</li>
    <li>telugu
    “`
  • map/object: this is collection of name value pairs describing a single key
    “`yaml
    address:
    flatno: 601
    building: nilgiri
    city: hyderabad
    address: { 'flatno': 601, 'building': 'nilgiri', 'city': 'hyderabad' }</li>
    </ul>
    “`
  • Refer Here for Ansible YAML Tutorial
  • Exercises:
    • What does --- signify in yaml
    • yaml has two extensions .yml or .yaml
    • abbreviate yml and yaml why we have two extensions
    • Setup ansible on AWS and Azure with two node setups

  Writing YAML for Ansible Playbook

  • We need to follow the structure defined by ansible
  • This will be discussed in next session

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