Intermediate LevelCloud Computing (AWS/GCP/Azure)
What is Azure App Service and how does it host web applications and APIs?
❓ Interview Prompt: Explain Microsoft Azure App Service PaaS, App Service Plans, Deployment Slots, and zero-downtime swaps.
Azure App Service is an HTTP-based Platform as a Service (PaaS) for hosting web applications, REST APIs, and mobile backends.
Key Capabilities:
1
App Service Plans: Defines the compute region, OS (Linux/Windows), and instance VM sizing allocated to run web apps.
2
Deployment Slots: Staging environments attached to an app (e.g. 'staging' slot).
3
Zero-Downtime Slot Swapping: Swapping staging to production exchanges IP routing instantly without downtime or warm-up delays.
4
Built-in Integrations: Native Azure Entra ID authentication bindings, SSL management, and GitHub Actions CI/CD pipelines.
Code Implementation Example
bash
# Swapping Azure App Service staging slot into production
az webapp deployment slot swap \
--resource-group myResourceGroup \
--name myExpressApp \
--slot staging \
--target-slot production💡Executing zero-downtime deployment slot swap in Azure App Service.
🎯 Interview Key Takeaway
Azure App Service hosts web apps on managed PaaS plans, using Deployment Slots for zero-downtime production swaps.
#Azure App Service#Azure#PaaS#Deployment Slots#Intermediate
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