Continuous delivery platform for Kubernetes

To achieve true blue-green deployments on Kubernetes (where you spin up a complete preview/standby environment, run automated validation tests, and instantly shift traffic), standard Kubernetes Deployment objects or basic GitOps sync tools aren't quite enough on their own. You need a progressive delivery controller or a specialized CD platform.linkedin.com+1

The top platforms and tools capable of handling blue-green deployments on Kubernetes effectively include:

1. Argo Rollouts (with Argo CD)
   • How it works: While base Argo CD handles pure GitOps state reconciliation, Argo Rollouts is a drop-in replacement for standard Kubernetes Deployments. It uses a Rollout custom resource specifically engineered for Blue-Green and Canary strategies.
   • Key features: Active and preview service switching, automated or manual promotion gates, pre/post-promotion analysis using metrics (Prometheus, Datadog), and configurable scale-down delays for instant rollbacks.argo-rollouts.readthedocs.io+2
2. Harness CD
   • How it works: An enterprise-grade continuous delivery platform that natively orchestrates Kubernetes blue-green deployments out of the box.
   • Key features: Automatically manages primary and stage services, handles pod set scaling, executes verification steps (such as querying error rates or latency via APM tools), and performs automated rollbacks or traffic swaps without requiring complex custom ingress script configurations.developer.harness.io
3. Flagger (by Weaveworks / Flux ecosystem)
   • How it works: If your stack leans toward Flux CD for GitOps, Flagger is a progressive delivery operator that automates blue-green (and canary) deployments.
   • Key features: It hooks into your service mesh (Istio, Linkerd, AWS App Mesh) or ingress controllers (Nginx, Traefik) to toggle traffic between the blue and green backends based on continuous metric checks.
4. Spinnaker
   • How it works: An open-source, multi-cloud continuous delivery platform originally created by Netflix.
   • Key features: Features robust, pipeline-driven deployment strategies for Kubernetes, allowing you to explicitly design a blue-green stage, run integration tests against the green cluster, and disable the blue cluster upon success.

To help narrow down the ideal choice, let me know:

• Are you already using a GitOps tool like Argo CD or Flux?
• Do you have a service mesh (like Istio or Linkerd) or an ingress controller (like NGINX) handling your traffic routing?
• Are you looking for an open-source toolset or an enterprise platform with built-in support?