CloudFormation Template

• JSON File

Lab Setup

• Install Visual Studio Code

How to Write a CF Template

• Create a directory "hellocf"
• In this directory create a file "main.json"
• Contents of main.json are

{
    
}

• CF Template has a certain structure to be followed. Refer here for structure
• Lets fill the basic elements in out template

{
  "AWSTemplateFormatVersion": "",
  "Description": "",
  "Resources": {
      
  }   
}

• Lets Fill the AWSTemplateFormatVersion by referring here

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "",
  "Resources": {

  }   
}

• Lets Fill the Description with some purpose

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "This is my first cf template",
  "Resources": {

  }   
}

• Lets Write a Resource to create a network (VPC) in AWS
• Google by using following query aws cloudformation <servicename>
• Now create Resource in Resources section using following syntax

<ResourceName>: {
    "Type": "<Resource Type Defined by AWS>",
    "Properties" : {

    }
}

• Now lets add the myvpc resource with 192.168.0.0/16 as the cidr range

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "This is my first cf template",
  "Resources": {
      "myvpc":{
        "Type" : "AWS::EC2::VPC",
        "Properties" : {
            "CidrBlock" : "192.168.0.0/16",
            "Tags" : [ 
                {
                    "Key": "Name",
                    "Value": "From CF"
                }
            ]
          }
      }
      

  }   
}

• So far we have written a Template
• Now when we execute this template it becomes Stack
• Stack Creates everything written in Template or nothing
• To Create a stack login into AWS, Navigate to CloudFormation and then create a stack by uploading template.
• Once you are done delete stack.