DevOps Classroom notes 17/Dec/2023

Name Value Pair

• Any data will be having two information
  • name (key)
  • value
• Lets write the name and value <name>: <value>

model: Dell Lattitue 7490
RAM: 32 GB
processor: i7 6th Gen
apps:

address:

• Data Types:
  • Simple/Scalar
    • number
    • text
    • boolean
  • Complex
    • list/array
    • objects/maps
• Lets design structure for resume

Name: <text>
role: <text>
Phone: <text>
Email: <text>
Summary: <text>
Skills: list<name-value> (scripting: shell, bash, powershell)
Experience: list<map>

• Lets design structure for movie ticket

Theatre:  <text>
ticketnumber: <number>
Screen: <number>
seat: <text>
price: <number>
showtime: <text>

JSON (Java Script Object Notation)

• JSON is a format for representing data in name value pairs. This is inspired from java script objects
• details:
  • text: use single or double quotes
  • number: directly write value no quotes required
  • boolean: true false
  • list/array: []
  • map/object: {}
• Sample resume in Json

{
    "name": "xxxxx",
    "role": "xxxxx",
    "phone": "xxxxx",
    "email": "xxxxx",
    "summary": "xxxxx",
    "skills": {
        "scripting": [ "bash", "powershell", "python" ],
        "os": ["Linux", "Windows" ]
    }
}

• Sample json

{
    "Vpcs": [
        {
            "CidrBlock": "172.31.0.0/16",
            "DhcpOptionsId": "dopt-57c2e92d",
            "State": "available",
            "VpcId": "vpc-cd32bcb0",
            "OwnerId": "678879106782",
            "InstanceTenancy": "default",
            "CidrBlockAssociationSet": [
                {
                    "AssociationId": "vpc-cidr-assoc-80e77def",
                    "CidrBlock": "172.31.0.0/16",
                    "CidrBlockState": {
                        "State": "associated"
                    }
                }
            ],
            "IsDefault": true
        },
        {
            "CidrBlock": "10.100.0.0/16",
            "DhcpOptionsId": "dopt-57c2e92d",
            "State": "available",
            "VpcId": "vpc-0bfd00988c8efeeb0",
            "OwnerId": "678879106782",
            "InstanceTenancy": "default",
            "CidrBlockAssociationSet": [
                {
                    "AssociationId": "vpc-cidr-assoc-01681eb957dd95726",
                    "CidrBlock": "10.100.0.0/16",
                    "CidrBlockState": {
                        "State": "associated"
                    }
                }
            ],
            "IsDefault": false,
            "Tags": [
                {
                    "Key": "Env",
                    "Value": "Dev"
                },
                {
                    "Key": "Name",
                    "Value": "ntier-primary-manual"
                }
            ]
        }
    ]
}

• Lets use jso viewer and collaps the items on right hand side to find the structure Refer Here
• If you want to query json we have two popular ways
  • JQ Refer Here
  • JMESPath Refer Here
• Azure, AWS CLI support jmes natively

YAML

• YAML is also a data representation format which use name value pairs
• YAML is heavily inspired from python
• details:
  • text: use single or double quotes or without quotes (if value has characters )
  • number: directly write value no quotes required
  • boolean: true false yes no
  • list/array: [] or refer below
  • map/object: {} or refer below
• Sample resume in YAML

name: xxxxxx
role: xxxxxx
phone: 'xxxxxx'
email: xxxxxx
summary: xxxxxx
skills:
  scripting: 
    - bash
    - powershell
    - python
  os:
    - linux
    - windows  

• YAML viewer Refer Here
• YAML can be queried using yq Refer Here