Azure App Service

  • A fully managed platform (PaaS) for building, deploying, and scaling your web apps.
  • Different types of App Services: Web Apps, Web Apps for Containers, and API Apps
  • Automatically patches and maintains the OS and language frameworks.
  • App Service can scale up or out manually or automatically.
  • App Service supports the following languages:
    • .NET
    • .NET Core
    • Java
    • Ruby
    • Node.js
    • PHP
    • Python

  • An App Service plan is a collection of compute resources needed for a web app to run.
  • Each App Service plan consists of a region, number & size of virtual machines and pricing tier.
  • App Service plan pricing tier: 
    • Shared Compute Free and Shared are the two base tiers. These tiers allocate CPU quotas to every app running on the shared resources, but the resources cannot scale-out.
    • Dedicated Compute – It is composed of Basic, Standard, Premium, and PremiumV2 tiers. As the tier gets higher, you will have more VMs to scale-out.
    • Isolated – A dedicated virtual machine that provides maximum scale-out capabilities.

App Services Types:

  • Web Apps
    • Website and online applications hosted on Azure’s managed platform.
    • Build and deploy mission-critical web applications that scale with your business.
    • It supports auto-scaling and load balancing for resilience and high availability.
  • Web Apps for Containers
    • Deploy and run containerized applications in Azure.
    • All dependencies are shipped inside the container.
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  • API Apps
    • Expose and connect your backend data.
    • Connect other applications programmatically.


  • Deployment components in App Service:
    • Deployment Source – it is where the application code is stored.
    • Build Pipeline – reads your code and takes the application in a running state
    • Deployment Mechanism – enables you to put your application in the /wwwroot directory. It also supports Kudu endpoints, FTP, and WebDeploy.
  • Deployment Center lets you choose the location of your code, as well as build and deploy to the cloud. It also has built-in continuous delivery for containers.
  • Swap app content and configurations elements with deployment slots.
  • App Service supports the continuous deployment of code and containers.
  • You can use local cache and deployment slots to prevent downtime.
  • App Service diagnostics will help you in troubleshooting your application.


  • App Service protocols: HTTPS, TLS 1.1/1.2 and FTPS
  • The default domain name is using HTTPs. You can also secure your custom domain using an SSL/TLS certificate.
  • Service endpoints allow you to restrict access from a virtual network.
  • The first IP restriction rule has an explicit Deny all rule with a priority of 2147483647.
  • Service-to-service authentication:
    • Service Identity – you can use the identity of the app to access the remote resource.
    • On-behalf-of (OBO) – allows you to access a remote service using a delegated sign-in.

VNet Integration

  • It allows your app to access resources in your virtual network.
    • Regional VNet Integration 
      • You need to have a dedicated subnet to the services that you integrate with.
      • Block outbound traffic using network security groups.
      • Route table allows you to send outbound traffic.
    • Gateway-required VNet Integration 
      • Allows access to resources in the target virtual network.
      • Sync network allows you to sync certificates and network information.
      • You can also add routes for outbound traffic.

Hybrid Connections

  • Uses host:port combination.
  • It provides network access to your application using a TCP endpoint.
  • Supports access to multi-networks from a single app.
  • Host your hybrid connection endpoint using a relay agent or Hybrid Connection Manager (HCM).
  • You can run multiple HCMs on a separate machine to achieve high availability.


  • You are charged on a per-second basis in the App Service plan.
  • You are charged for the applications while they are in a stopped state.
  • You are charged for data egress when using VNet Integration.
  • You are charged for each listener in a Hybrid Connection


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