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CloudFormation.md

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CloudFormation is an automated tool for provisioning entire cloud-based environments. It is similar to Terraform where you cofify the instructions for what you want to have inside your application setup (X many web servers of Y type with a Z type DB on the backend, etc). It makes it a lot easier to just describe what you want in markup and have AWS do the actual provisioning work involved.

  • The main usecase for CloudFormation is for advanced setups and production environments as it is complex ans has many robust features.

  • CloudFormation templates can be used to create, update, and delete infrastructure.

  • The templates are written in YAML or JSON

  • A full CloudFormation setup is called a stack.

  • Once a template is created, AWS will make the corresponding stack. This is the living and active representation of said template. One template can create an infinite number of stacks.

  • The Resources field is the only mandatory field when creating a CloudFormation template

  • Rollback triggers allow you to monitor the creation of the stack as it's built. If an error occurs, you can trigger a rollback as the name implies.

  • AWS Quick Starts is composed of many high-quality CloudFormation stacks designed by AWS engineers.

  • An example template that would spin up an EC2 instance

      Resources:
      Type: 'AWS::EC2::Instance'
      Properties:
          ImageId: !Ref LatestAmiId
          Instance Type: !Ref Instance Type
          KeyName: !Ref Keyname

  • For any Logical Resources in the stack, CloudFormation will make a corresponding Physical Resources in your AWS account. It is CloudFormation’s job to keep the logical and physical resources in sync.

  • A template can be updated and then used to update the same stack.

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