MultiCloud Classroom notes 31/May/2025

Cloudformation

• AWS Cloudformation allows us to create infra based on a template
• Template can be written in json/yaml format
• JSON is a file format for representing data. JSON follows key value pair to define it structure

"<key>": <value>

• Value can be of different types
  • text: this is generally surrounded with single or double quotes "movie": "retro" or 'movie': 'retro'
  • numer: This is any number 'runtime': 130
  • boolean: This has two values true or false 'theare': false
  • list/array: this has values of any type in [] 'actors': ['surya', 'pooja']
  • map/dictionary/object: this generally represents a complex type which requires more key value pairs to describe. This is surronded with {}

{
    "name": "Multicloud",
    "starttime": "19:00",
    "topics": ["json", "yaml", "cf"],
    "mode": ["online", "offline"],
    "where": {
        "flat": "601-A",
        "building": "nilgiri",
        "city": "Hyberabad"
    }
}

• YAML is a file format for representing data. YAML follows key value pair to define it structure

key: <value>

• Value can be of different types
  • text: this is generally surrounded with single or double quotes movie: "retro" or movie: 'retro' or movie: retro
  • numer: This is any number runtime: 130
  • boolean: This has two values true or false or yes or no theare: no
  • list/array: this has values of any type in [] actors: ['surya', 'pooja']
    “`yaml
    actors:</li>
    <li>surya</li>
    <li>pooja
    “`
  • map/dictionary/object: this generally represents a complex type which requires more key value pairs to describe. This is surronded with {}
    “`yaml
    address:
    flatno: 601-A
    building: nilgiri</li>
    </ul>
    “`
    * Example

  ---
  name: Multicloud
  starttime: '19:00'
  topics:
    - json
    - yaml
    - cf
  mode:
    - online
    - offline
  where:
    flat: 601-A
    building: nilgiri
    city: Hyberabad
  
  

  

  Building Blocks of Cloudformation

  • Template: This uses a json or a yaml file in a format defined by aws Format
  • Stack: When we want to create infra, we create a cloudformation stack, where we pass the template. By default stack creates everything or nothing. stacks can be updated to recreate/modify the infrastructure created.

  Template components

  • Version
  • Parameters
  • Resources
  • Outputs

  Minimial Template

  • This requires only Resources

  {
      "Resources": {
          "mybucket": {
              "Type" : "AWS::ServiceName::ResourceType",
              "Properties" : {
                  "PropertyName1" : "PropertyValue1",
              }
  
          }
      }
  }
  

  Lets create a cloudformation template for Network

  • Create a new folder & open in visual studio code
  • Create a new file main.json
  • To find the structure of vpc google aws cloudformation vpc
    
    
  • This is our first template

  {
      "Resources": {
          "network" : {
              "Type" : "AWS::EC2::VPC",
              "Properties": {
                  "CidrBlock": "192.168.0.0/16",
                  "EnableDnsHostnames": true,
                  "Tags": [{
                      "Key": "Name",
                      "Value": "from-cf"
                  }]
              }
          }
      }
  }
  

  • To create a cf stack watch classroom recording
  • To be productive in terms of authoring templates, visual studio code has extensions
    
  • Refer Here for the changes done.

  Share this:

  • X
  • Facebook
  • WhatsApp