AWS CloudFormation( Infrastructure as a code )

AWS CloudFormation provides users with a simple way to create and manage a collection of Amazon Web Services (AWS) resources by provisioning and updating them in a predictable way.

Working model

• Firstly we have to code our infrastructure in a YAML or JSON text-based file which is called a template.
• Then locally we write our code in the AWS CloudFormation tool. Otherwise we can upload a YAML or JSON file into the S3 bucket.
• Next use the GUI of AWS CF or the Command Line Interface to create a stack based on our template code.
• At last, CloudFormation will deploy resources, provision it and configures the template which we specified.

Cloud Pipeline interact with CloudFormation

• You can use AWS CodePipeline to trigger a Cloud Formation template to run in the deployment phase.

The pipeline has following stages:

• Source phase: Fetch the latest commit.
• Build phase: Build the code into a docker image and push it to ECR.
• Deploy phase: Take the latest docker image from ECR, deploy it to ECS

Circular dependency error in AWS CloudFormation : When two are dependent on one another we will get a circular dependency error because AWS CloudFormation is unable to clearly determine which resource should be created first.

To resolve a dependency error, add a DependsOn attribute to resources that depend on other resources in your tem