Creating Infrastructure in AWS

• To create infra in AWS we have three possible ways
• Console => Manual
• CLI => Scripted/Procedural
• Cloud formation => Infrastructure as Code (IaC) / Declarative
• AWS Cloud formation is an IaC which helps in provisioning infra at scale declarativly
• Process of Creating Infra using AWS CloudFormation
• Identify the resource to be created
• Identify the variables
• Author/Write/Create an AWS Cloudformation template in JSON/YAML files
• Once the template is ready, then create a CloudFormation Stack to deploy the application.
• Lets try to see one example
  
  
  
  
  
  
  
  
  
• To deploy word press we have taken some template and created stack, if you have similar template created for your application deployment, will it not be useful for ci/cd and multi environment creations?
• Once you have finished using your application, we can delete the infra by deleting the stack.
• Changes can be made in the deployed infra, by updating a template => updating the stack.

Authoring CloudFormation Template

• Developer Setup:
• Ensure Visual Studio Code is installed
• Ensure Cloudformation extension is installed
  
• Template anatomy: Refer Here for the official docs
• Cloud formation has a specific structure and the elements are
• AWSTemplateFormatVersion:
  • This the version of the template schema
  • datatype: string
  • value: “2010-09-09”
• Description:
  • A text describing your template
• Metadata:
  • This is an object which provides additional information about the template
• Parameters:
  • Values to pass at runtime
• Rules:
  • Validates a parameter or combination of paramters passed to a template during stack creation or updation process
• Mappings:
  • A mapping of key and associated values
• Conditions
  • Conditions that control wheter a certian resources are created or not
• Transform
• Resources:
  • This is the only required field
  • In this you describe the resource to be created as part of CF Stack creation process.
• Outputs
• Lets try to write our first Cloud formation template to create an S3 bucket
• Manual steps:
  
  
  
• Lets create a cf template for this.
• To create s3 bucket the resource has the structure as shown Refer Here
• Refer Here for the template created & Now create a stack