Code Library

A Web App is a web application that is hosted in an App Service. The App Service is the managed service in Azure that enables you to deploy a web application and make it available to your customers on the Internet in a very short amount of time. As noted above, you don’t directly support the VMs on which your web app runs; they are managed for you. In fact, you don’t have access to those underlying VMs.

Supported languages include .NET, Java, PHP, Node.js, and Python. In addition to creating your own web app, there are several web applications available to use as a starting point, such as WordPress, Umbraco, Joomla!, and Drupal.

You can use continuous deployment with Team Foundation Server (TFS), GitHub, TeamCity, Jenkins, or BitBucket so that every time you commit a change, a new version of the web app is deployed.

Scaling is done by scaling the App Service plan to which the web app belongs. You can scale the number of instances in and out on demand. You can configure autoscaling so Azure will scale it in or out for you depending on specific performance measures such as CPU percentage. You can also publish your website to multiple locations and use the Azure Traffic Manager to handle the routing of the traffic to the location nearest to your customer.

For diagnostics, you can gather performance statistics, application logging, web server logging, IIS logs, and IIS Failed Request logs. If you’re using Microsoft Visual Studio, you can even remotely debug your application while it is running in the cloud.

In short, there are many features available when using Web Apps to make it easy for you to deploy, manage, and troubleshoot a web application.


Options for creating Web Apps
There are multiple options for creating a Web App and deploying the content to an app service. Let’s look at a few of these, including the following.

 Azure Marketplace This contains all of the resources you can deploy in Azure. I’ll show you how you can use this to create Web Apps from preexisting templates such as WordPress.

 Visual Studio Code This is a free, open source, cross-platform code editor with debugging capabilities.

 Visual Studio This is Microsoft’s full-featured development IDE.


Marketplace
There are many pre-created websites and templates in the Azure Marketplace that you can use. To see all of the options available, log into the Azure portal and click New > Web + Mobile > See All.

If you scroll down on the page, you can see the categories. At the end of any row, clicking More will show additional options in that category. Here are just a few of the choices available:
 Web Apps Web App, Web App + SQL, Web App + MySQL, WordPress, and Umbraco CMS
 Blogs + CMSs Joomla!, Drupal, DNN, Orchard CMS, Umbraco CMS, and MonoX
 Starter Web Apps ASP.NET, HTML5, Node.js, PHP, Apache Tomcat, and some examples like the Bakery web app and the Java Coffee Shop web app


Visual Studio Code
Visual Studio Code (VS Code) is a free, open source code editor with support for development operations such as debugging, task running, and version control. It runs on Windows, OS X, and Linux.

VS Code makes debugging easier, providing IntelliSense code completion and easy code refactoring. It integrates with Git and also package managers, repositories, and various build tools.

VS Code has built-in support for Node.js, JavaScript, and TypeScript. Using extensions, you can use VS Code to debug languages such as C#, C++, Python, Ruby, and PowerShell. There is also tooling for web technologies such as HTML, CSS, JSON, and Markdown.

Using the Azure portal, you can set your web app to get the source code from OneDrive, Dropbox, or a local code repository such as GitHub or Visual Studio Team Service. If you enable continuous deployment for your WebApp, updates will be published automatically when changes are made to your source repository.


Visual Studio
Visual Studio is a full development environment, giving you the ability to create many different kinds of applications including, but not limited to, ASP.NET MVC applications, .NET client applications, Windows Communication Foundation (WCF) services, Web APIs, and Cloud Services, using languages such as C#, C++, VB, F#, and XAML. With Visual Studio, you can create a new web application and publish it to an app service in Azure.

Source of Information : Microsoft Azure Essentials Fundamentals of Azure Second Edition