100 Days of Cloud – Day 52: Azure App Service

Its Day 52 of my 100 Days of Cloud journey, and today I’m taking a look at Azure App Service.

How to Create a Serverless Meme-as-a-Service

After all my promises on Day 49 around doing further blogs on services such as AKS, Azure Monitor, Azure Security Center or Azure File Sync, I’m sure you weren’t expecting me to head off into another direction. The truth is dear reader that I have a rather embarrassing admission to make – I failed to follow my own advice….lets set the scene.

We go back in time to Day 17 where I spoke about the then upcoming Microsoft Ignite Cloud Skills Challenge, which enabled you to obtain a free exam voucher for completing an MS Learn Module. The exam voucher needs to be used by March 15th, and from the list of exams that were on the eligibility list, below were the ones that were of interest to me:

But of course Michael jumped ahead and booked the betas for AZ-800 and AZ-801 (as described in Day 47 and Day 51). So those 2 get scratched off the list and I get left with a choice of 3. And my own advice from Day 17 is ringing in my head:

Its not worth doing it if the only reason is for a free voucher and you don’t really know what to use it for, and then just take an exam for the sake of it because you have the voucher.

So what do I do? I could let the exam expire, or I could pick one of the 3 remaining and give it a go. And as this 100 Days journey is learning experience, I decide to go for the one that I will freely admit I know the least about, and thats AZ-204. Loading up the Microsoft Learn modules from the official exam page, the first thing I see is Azure App Service! A-ha! This looks familiar, and it should as the content was covered briefly on AZ-104.

Overview of Azure App Service

Azure App Service is a Platform as a Service (PaaS) offering that is used to host web applications, REST APIs and mobile back end services.

Because this is a PaaS offering, the underlying infrastructure is fully managed and patched by Azure. You can choose to run App Service on either Windows or Linux platforms depending on your application requirements. Because of this, you can use any programming language to run your Web Applications or Service, and these can the be hosted on App Service. This list includes but is not limited to:

  • .NET
  • Java
  • Node.js
  • Ruby
  • PHP
  • Python

Benefits of App Service

Because Azure App Service is a PaaS offering, it means that you are only responsible for managing the application/service and the data. Everything else is managed by Azure.

As well as the range of programming languages that are supported, you can also run scripts or executables as background services.

You can also scale in/out (adds/removes additional VMs as required) or scale up/down (adds/removes CPU or memory resources as required).

Lets compare this to hosting on your own on-premise servers. You are responsible for the following:

  • Procurement of Physical Servers, Storage, Networking equipment
  • Power and Cooling
  • Networking setup and security
  • Virtualization, Operating System (Installation, Patching, System Upgrades)
  • Middleware Components
  • Configuration of Web Services such as Apache, IIS or Nginx

App Service Plans

As with all Azure Services, there are different pricing tiers that define the compute resources that are allocated to your App Service. There are 4 different tiers to choose from:

  • Shared compute: Both Free and Shared share the resource pools of your apps with the apps of other customers. These tiers allocate CPU quotas to each app that runs on the shared resources, and the resources can’t scale out.
  • Dedicated compute: The Basic, Standard, Premium, PremiumV2, and PremiumV3 tiers run apps on dedicated Azure VMs. Only apps in the same App Service plan share the same compute resources. The higher the tier, the more VM instances are available to you for scale-out.
  • Isolated: This tier runs dedicated Azure VMs on dedicated Azure Virtual Networks. It provides network isolation on top of compute isolation, and maximum scale-out capabilities. You should run in Isolated if your app is resource intensive or needs to scale independently of other apps.
  • Consumption: This tier is only available to Azure Function apps. It scales the functions dynamically depending on workload.

Deployment Options for App Service

You have multiple options for deployment of your App Service. Automated deployment options are:

  • Azure DevOps
  • GitHub
  • Bitbucket

All of these options allow you to build your code, test and generate releases, and push the code changes to Azure. You also can maintain version control with these options.

Manual deployment options are:

  • Git – Web Apps have a Git URL that you can use a remote repository to deploy your Web App.
  • Azure CLI – you can package Web Apps and deploy them using CLI.
  • ZIP Deploy – Use curl or similar http to send a zip of your deployment files to App Service.
  • FTP/S – you can push your code directly to App Service over FTP or FTPS.


Azure App Service allows you to integrate directly with multiple providers such as Azure AD, Facebook, Google or Twitter. This feature is built directly into the platform and doesn’t require any coding, language or security expertise to implement.


So thats an overview of the foundations of Azure App Service. In the next post, we’ll go through a demo of deploying a Web App using both manual and automated methods, and look at more advanced options like configuring diagnostic settings, auto-scaling and deployment slots.

Hope you enjoyed this intro to Azure App Service, until next time!

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