In this article, we’ll learn about Serverless Computing. There are different components associated with it and here we’ll focus on Azure and the services it provides for Serverless Architecture. C# Corner is also having a week-long virtual event on Azure — Azure Summit 2021. To learn more about Azure and its constituent technologies, attending this event will help you explore and experience deeper with Azure. Check out the official website of the summit to register as an attendee or to be a speaker and share your knowledge with the community.

What is Serverless and Why do we need it?

Serverless is basically a method of computing where the demanded resources are made available as they are needed by the processes. The engineers can code and deploy their systems without having to worry about the infrastructure that lies underneath. Since the client only pays based on the computation used, the old methods of having to pay a fixed amount for specific bandwidth and number of servers have now become obsolete and they play on a rolling basis as the use of the service which supports auto-scaling. As the name suggests, it isn’t the case that server doesn’t exist or aren’t needed but the gist is such that the engineers who run and deploy the system don’t necessarily have to be aware of them, thus the name. Going Serverless enables organizations with on-demand resources for your high–end needs whenever required.

It was cumbersome and expensive to own physical hardware itself during the early days of the internet which was the only option. Later, cloud computing became a go-to technology but it was charged upon the bandwidth and fixed remote server space rental basis. The companies and engineers who would purchase these servers would often buy more space and server numbers than what was required just to be assured to feel the security of having the abundance of servers for spikes in traffic, which are mostly always overestimated costing mammoth bills. With Serverless, the cloud service providers have now brought in the technology of auto-scaling and have made the serverless architecture a possibility. Howsoever, during DDOS attacks, the rise in the scaled server can be hard for the bank of the clients of the serverless systems. Shown below is the Serverless architecture for a web application.


Microservices Architecture is basically an architectural style of structuring an application as a collection of services such that they are loosely coupled, highly maintainable, independently deployable, and are organized about the business capabilities. This architecture of structuring the application enables even complex, large applications to be delivered in a rapid and reliable manner. The technology stack of the system is also supported to be evolved easily in time. Microservices basically focuses on the single–responsibility principle. Here, the system can be scale as her the need and has each functionality isolated in a different separate Lamba function.

Cloud-native integrations

With the serverless architecture, cloud-native applications can be built easily without having to concern about the infrastructure which scales automatically by the service itself, has it’s available at all times and has high performance.

Components of Serverless Architecture in Azure

Azure Functions

Azure Functions is the popular serverless compute platform on Microsoft Azure, supporting rapid integration with the Microsoft suite of products. Azure Functions is an event-driven serverless compute platform which enables complex orchestration difficulties to be solved easily. Using Triggers and Bindings, services can be integrated. Applications can be deployed and scaled flawlessly in the cloud with Azure functions. Depending on the workload volume, the infrastructure scales automatically. Building, debugging, deploying, and monitoring are all possible with ease with the built-in DevOps capabilities supported by the Azure Functions. It supports multiple programming languages from C#, Python, Java, or Node.js. With the use of Azure Functions, it can drastically minimize the time to solve problems compared to traditional approaches thus saving the time of developers and duration to provide service to the clients.

Blob Storage

The static contents of the web applications such as the HTML, CSS, and JS files are stored in the Azure Blob Storage. Server-side codes have not required the load of the page and all the interactions are performed dynamically with JS codes that communicate through the back-end APIs. This static hosting storage only supports the index documents and error pages like 404.


Azure Content Delivery Network is used in the serverless architecture to cache the contents for faster delivery and low latency of the resources and contents of the web app.

Cosmos DB

Cosmos DB is basically a database service that is multi-model. To achieve high availability, low latency, and instant scalability Azure Cosmos DB is used. It guarantees speed at any scale and thus assures real-time access to the data with support for business continuity in cases of crisis.

Read the previous article on Business Continuity And Disaster Recovery In Azure For SQL Database.

Azure Active Directory

Azure AD credentials are used by users to sign in to web applications. Azure Active Directory provides an access token for API and that token is then used to authenticate the API requests.

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