guillermo-ampie / promote-to-production-exercise

A sample Blue/Green deployment using AWS CloudFormation with CircleCI

promote-to-production-exercise

A sample Blue/Green deployment using AWS CloudFormation with CircleCI

Description

A static website (using an Amazon S3 bucket) is updated using a Blue/Green deployment strategy using CircleCI to promote the green environment and clean-up of the blue environment automatically.

Usage

CircleCI Environment Variables

You need to set up the following CircleCI environment variables to configure the AWS CLI under CircleCI:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• AWS_DEFAULT_REGION

Steps

1.- Run: build_first_deployment.sh, this creates an Amazon S3 bucket and a CloudFront Distribution:

• The AWS S3 bucket is configured for static web browsing
• The CloudFront Distribution represents your "router" in the deployment
• To access the website, use the CloudFront Distribution's Domain Name value:
  • The endpoint has this structure: AUTO_GENERATED_VALUE.cloudfront.net

2.- Update the website: for example, change the version number in the file index.html

3.- The CircleCI pipeline will:

• create a new S3 bucket
• store the new website version in it
• If the smoke tests fail, it will trigger a rollback deleting the green candidate frontend, and then the pipeline stops.
• swap the new bucket(green version) with the currently attached bucket(blue version) to the CloudFront distribution
• delete the blue environment

4.- Refresh your browser tab; you must see the "new" web site

5.- To delete all resources, run: cleanup_resources.sh