TechOps Examples
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🧠 DEEP DIVE USE CASE
How Blue and Green Deployments Work in AKS
For someone new to blue green deployments, it means running two identical environments where only one serves users at a time.
Blue is the current live version, and Green is the new version you prepare and test before switching traffic to it.
In Azure Kubernetes Service, blue green is implemented by introducing a second AKS cluster and controlling which cluster receives traffic through the ingress layer exposed via Azure networking components.
You typically have two access patterns:
1. Public Facing Pattern
User → Azure DNS → Azure Front Door → Azure Application Gateway → app endpoints → AKS cluster
In the public facing pattern, Azure Front Door and Azure DNS are used to switch traffic between the Blue and Green clusters.
2. Private Facing Pattern
User → Azure DNS → Azure Application Gateway → app endpoints → AKS cluster
In the private facing pattern, Azure DNS performs the switch between the Blue and Green clusters using A and CNAME records.
In both these use case examples, Azure Application Gateway provides the front end for the cluster endpoints. The blue green change is therefore not happening inside AKS itself. It happens through the Azure routing components placed in front of the clusters.
With this basic understanding, let us look at how blue green deployments work in Azure Kubernetes Service step by step through the architecture diagrams.
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