Intro

A Function App lets you group functions as a logical unit for easier management, deployment and sharing of resources. Functions lets you execute your code in a serverless environment without having to first create a VM or publish a web application

Documentation

Tips and Tidbits

Create A Function App

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• When you create a function app in Azure, you must choose a hosting plan for your app.

  • Azure Functions hosting options

• There are three basic hosting plans available for Azure Functions: 

  • Consumption plan, 

    • Scale automatically and only pay for compute resources when your functions are running.

    • On the Consumption plan, instances of the Functions host are dynamically added and removed based on the number of incoming events.

  • Premium plan

    • Automatically scales based on demand using pre-warmed workers which run applications with no delay after being idle, runs on more powerful instances, and connects to virtual networks.

    • Your function apps run continuously, or nearly continuously.
      ✔ You have a high number of small executions and a high execution bill, but low GB seconds in the Consumption plan.
      ✔ You need more CPU or memory options than what is provided by the Consumption plan.
      ✔ Your code needs to run longer than the maximum execution time allowed on the Consumption plan.
      
      

  • Dedicated (App Service) plan.

    • Best for long-running scenarios where Durable Functions can't be used. Consider an App Service plan in the following situations:

      ✔ You have existing, underutilized VMs that are already running other App Service instances.
      ✔ Predictive scaling and costs are required

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