AWS Classroom Series – 13/Jul/2021

CloudFormation contd..

• Understand Cloudformation template structure

  • Refer Here for the official documentation

• Lets try to create a cloudformation template to create an s3 bucket

  • Resource: S3 bucket
  • Information to be passed
    • name of the bucket
    • location of bucket

• Necessary software setup:

  • Refer Here for softwares
  • Windows Terminal Refer Here

• Developer Setup

  • Ensure visual studio code is installed
  • Cloudformation extension is installed
    

• Refer Here for the json and yaml template to create the s3 bucket

• Write Cloudformation template to create two s3 buckets

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "exploring cloud formation",
    "Resources": {
        "mys3bucket1" : {
            "Type": "AWS::S3::Bucket",
            "Properties": {
                "BucketName": "qts3cfjson1"
            }
        },
        "mys3bucket2" : {
            "Type": "AWS::S3::Bucket",
            "Properties": {
                "BucketName": "qts3cfjson2"
            }
        }
    }
}

• In yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: exploring cloud formation
Resources:
  mys3bucket1:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: qts3cfjson1
  mys3bucket2:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: qts3cfjson2

• When we want to create resources using cloudformation we create a template in json or yaml file and then we create a stack in cloudformation and use the template.
• To create resources we need to provide type and properties.
• Once the cloudformation stack has created resources we can make changes as well by adding/modifying properties. Some property changes may lead to deletion and recreation of resources
  • Replacement: Deletes and recreates the resource
  • No Interruption: This property can be updated without deletion so it is considered as no interruption
  • Properties can be of primitive types or custom types (objects)

Example 1: Lets create a vpc with cidr range of 192.168.0.0/16

• Manual Steps
• We are creating a resource vpc with cidr range of 192.168.0.0/16
• The template is as shown below

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "exploring cloud formation",
    "Resources": {
        "myvpc": {
            "Description": "this is my vpc",
            "Type": "AWS::EC2::VPC",
            "Properties": {
                "CidrBlock": "192.168.0.0/16",
                "Tags": [
                    {
                        "Key": "Name",
                        "Value": "vpcfromcf"
                    },
                    {
                        "Key": "CreatedBy",
                        "Value": "CloudOps"
                    }
                ]
            }
        }
    }
}

• Creation of stack will lead to a vpc resource
• Refer Here for the samples created in the class.