deployment-aws-canary-setup

Canary deployments for AWS Lambda are set up by provisioning a versioned Lambda function, a live alias, CloudWatch alarms, and a CodeDeploy deployment group within a CDK stack to shift traffic gradually and roll back automatically.

Automated rollback during Lambda traffic shifting is achieved by configuring CloudWatch alarms for errors and latency, then linking them to a CodeDeploy deployment group configured with a Canary or Linear deployment config.

CodeDeploy supports both canary and linear deployment strategies for Lambda functions, allowing you to manage traffic during upgrades by gradually shifting traffic and automatically rolling back on detected issues.

A Lambda alias and version are required for progressive deployments when you need to shift traffic between distinct function revisions, enabling CodeDeploy to route a percentage of traffic to the new version while retaining the old version for rollback.

CloudWatch alarms can trigger an automated rollback for serverless workloads by monitoring error rates and latency metrics, signaling CodeDeploy to halt the canary deployment and revert traffic to the previous Lambda version.

A Lambda canary deployment fails without a CodeDeploy deployment group because the group orchestrates the traffic shifting between function versions and manages the automated rollback responses triggered by CloudWatch alarms.