DevOps Classroom Series – 30/Jul/2020

Learning YAML and JSON

• Refer Here for YAML
• Refer Here for JSON quick reference
• YAML is a data serialization language which means you can represent data in the format of YAML.
• Each name value pair in YAML is represented as <name>: <value>
• If we think of any data the values are
  1. singular or simple:
     • you can represent text
     • you can represent numbers
     • you can represent booleans (True, False, yes, no)
     • Simple Text notations

     name: Quality Thought
     name: 'Quality Thought'
     name: "Quality Thought"
     

     • Multi line text notations

     about-us: |
         This institute was started by
         Ramana
     
     about-us: >
         This institute was started by
         Ramana
     
     

     • Number notations

     age: 10
     

     • Boolean notations

     is_online: yes
     is_online: true
     

  2. plural or list: can be represented with significant whitespace or in the form of []. Each item in normal notation starts with – (list item)
     • Example with standard notation

     courses:
       - DevOps
       - Azure
       - AWS
       - Linux
       - Python
       - Agile
     

     • In array notation

     courses: ["DevOps", "Azure", "AWS", "Linux", "Python", "Agile"]
     

  3. complex or object: An object has multiple name & value pairs
     • Sample address

     address:
       blockno: 208-B
       building: Nilgiri Block
       area: Ameerpet
       landmark: Ameerpet Metro
       city: Hyderabad
     

• The whole yaml is generally created with .yml or .yaml extensions
• Lets create a simple file qt.yml

name: QualityThought
courses:
  - DevOps
  - Azure
  - AWS
  - Linux
  - Python
  - Agile
address:
  blockno: 208-B
  building: Nilgiri Block
  area: Ameerpet
  landmark: Ameerpet Metro
  city: Hyderabad
  pincode: 560017

• In one file we can write multiple YAML if we separate with —

---
name: QT
courses: 
  - AWS
  - AZURE
  - DevOps
---
name: LT
courses:
  - BTech
  - MTech
  - Competitive exams

• Lets create a yaml file for some DevOps tools

---
title: Tools used in DevOps
tools:
  - name: Ansible
    purpose: ["CM", "Networking Automation", "Deployments"]
  - name: Chef
    purpose:
      - CM
  - name: Git
    purpose:
      - Version Control Systems
  - name: Maven
    purpose:
      - Build Java Based Code
  - name: MSBuild
    purpose:
      - Build .net code
      
  - name: Jenkins
    purpose:
      - CI/CD Engine

Ansible Installations

• Initially we will install Ansible on Ubuntu 18 server
• For documentation refer here
• In this series i will be using AWS instance . To know how to create aws ec2 Watch Here
• If you want to create azure vm watch Here
• Since we are installing on ubuntu Refer Here
• Commands to install Ansible on ubuntu

sudo apt update
sudo apt install software-properties-common -y
sudo apt-add-repository --yes --update ppa:ansible/ansible
sudo apt install ansible -y

• Basic Ansible installation representation
• Now lets create one node which is also ubuntu 18 and install python 2.7 in this node

sudo apt update
sudo apt install software-properties-common -y
sudo apt-add-repository --yes --update ppa:ansible/ansible
sudo apt install python -y

• Now we need to configure the inventory in ansible control node and establish credentials for ansible control node to log into the node and execute ansible tasks