AWS CloudFormation

Infrastructure as Code

  • Infrastructure as Code (IaC) is a way to provision and manage your infrastructure through code instead of through manual processes
  • With IaC, you can create configuration files that contain your infrastructure specifications, which makes it easier to edit and distribute configurations.
  • You provision the same environment every time in other account or region
  • That code would be deployed and create/update/delete our infrastructure
  • Version control is an important part of IaC, and your configuration files should be under source control just like any other software source code file.

What is CloudFormation

  • You can use AWS CloudFormation to create AWS resources in an orderly and predictable fashion.
  • Resources are written in text files using JSON or YAML format.
  • The templates require a specific syntax and structure that depends on the types of resources being created and managed.
  • A CloudFormation template is deployed into the AWS environment as a stack
  • For example, within a CloudFormation template, you can create a set of:
    • One security group
    • Two EC2 instance using this security group
    • One S3 bucket
    • One load balancer (ELB) in front of these EC2

CloudFormation Concept

  • When you use AWS CloudFormation, you work with templates and stacks
  • Topics
    • Templates
    • Stacks
    • Change sets
  • Templates
    • A CloudFormation template is a JSON or YAML formatted text file
    • CloudFormation uses these templates as blueprints for building your AWS resources
  • Stacks
    • When you use CloudFormation, you manage related resources as a single unit called a stack.
    • You create, update, and delete a collection of resources by creating, updating, and deleting stacks.
  • Change sets
    • If you need to make changes to the running resources in a stack, you update the stack.
    • Before making changes to your resources, you can generate a change set, which is a summary of your proposed changes.
    • Change sets allow you to see how your changes might impact your running resources, especially for critical resources, before implementing them.
AWS CloudFormation

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