AWS CodeDeploy vs Flagger

AWS CodeDeploy automates application releases across development, test, and production environments. It deploys to Amazon EC2, AWS Fargate, AWS Lambda, and on-premises instances using in-place, canary, or blue/green methods. Rolling updates and deployment health tracking help limit disruption; when too many updates fail, CodeDeploy can stop a deployment and restore a previous revision. Teams can launch and monitor releases through the AWS Management Console, CLI, SDKs, or APIs. AWS CodePipeline and some AWS partners offer prebuilt CI/CD connections. For EC2, CodeDeploy works with Auto Scaling and can update an instance before it joins an Elastic Load Balancing load balancer. Amazon SNS can send deployment-event notifications by SMS or email. The service uses a file- and command-based installation model with an AppSpec configuration file and is platform and language agnostic. EC2 deployments have no additional CodeDeploy charge; on-premises updates cost $0.02 per instance update, with no minimum fees or upfront commitments. On-premises instances must connect to public AWS service endpoints. The free plan is listed at free.

Flagger is a self-hosted Kubernetes operator that automates progressive delivery for applications running on Kubernetes. It gradually shifts traffic to a new version while checking measures such as HTTP or gRPC request success and latency. Deployment approaches include canary releases, A/B testing, and blue/green deployments, routed through an ingress controller or a service mesh compatible with the Kubernetes Gateway API. Built-in checks cover HTTP request success rate and duration; teams can add custom metrics and webhooks for acceptance tests, load tests, or other validation. Release analysis can query systems including Prometheus, Datadog, CloudWatch, New Relic, Graphite, Dynatrace, InfluxDB, and Google Cloud Monitoring. If SLO analysis detects a performance drop, Flagger rolls back the release automatically. Manual controls allow approval, pausing, or resuming deployments, and notifications can go to Slack, Microsoft Teams, Discord, or Rocket. It is configured through Kubernetes custom resources, works with Kubernetes-compatible CI/CD solutions, and can be used with Flux for GitOps canary pipelines. Flagger is Apache 2.0 licensed and free.