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September 18, 2025

Azure Container Apps Migration: Zero-Downtime .NET & SQL AG

16 minutes

Migrating a stateful .NET app from Azure VMs to Azure Container Apps without dropping a single request — including SQL Server Always On AG failover — is exactly the kind of scenario senior interviewers throw at platform engineers.

You'll learn:

How to containerize a stateful .NET app and handle session/state externalization before cutover

Azure Container Apps environment setup: managed environments, Dapr sidecars, and ingress configuration for gradual traffic shifting

SQL Server Always On Availability Group failover patterns — listener routing, read-scale replicas, and avoiding split-brain during migration

Blue/green and weighted traffic strategies in Azure Container Apps to achieve zero-downtime cutover

Common gotchas: persistent volume claims, connection string management with Key Vault references, and health probe tuning

Keywords: Azure Container Apps migration, SQL Server Always On failover, zero downtime .NET containerization, stateful app Azure Kubernetes migration, platform engineering interview

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