This article provides guidance on implementing a blue-green deployment strategy to test a new version of an Azure Kubernetes Service (AKS) cluster while continuing to run the current version. Once the new version is validated, a routing change switches user traffic to it. Deploying in this way increases availability when making changes, including upgrades, to AKS clusters. This article describes the design and implementation of a blue-green deployment of AKS that uses Azure managed services and native Kubernetes features.

https://learn.microsoft.com/en-us/azure/architecture/guide/aks/blue-green-deployment-for-aks