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Marco's Learning

Azure Solutions Architect

Azure App Service plans

How does my app run and scale? In the Free and Shared tiers, an app receives CPU minutes on a shared VM instance and can’t scale out. In other tiers, an app runs and scales as follows:

  • An app runs on all the VM instances configured in the App Service plan.
  • If multiple apps are in the same App Service plan, they all share the same VM instances.
  • If you have multiple deployment slots for an app, all deployment slots also run on the same VM instances.
  • If you enable diagnostic logs, perform backups, or run WebJobs, they also use CPU cycles and memory on these VM instances.

In this way, the App Service plan is the scale unit of the App Service apps. If the plan is configured to run five VM instances, then all apps in the plan run on all five instances. If the plan is configured for autoscaling, then all apps in the plan are scaled out together based on the autoscale settings.