Hi!
Welcome to this section on serverless computing paradigm.
In this section, we'll look at what serverless computing is, how is it different from traditional
"server-based" computing.
And, we'll also look at the four main benefits of serverless computing.
Before we look at Serverless Computing, let's first understand how the traditional "server-based"
computing works.
Server-based Computing typically follows a 3-tier architecture.
In 3-tier architecture, we have a database layer, an application layer, and a presentation
layer.
The database layer is where the database server is.
Application layer is where your application code runs.
And, presentation layer is where the UI is provided to the end user.
End users can interact with your application or your website in variety of ways.
They can use their web browser, or a mobile smartphone, or even an IoT device depending
on how you've designed your application.
Now, even before you start writing your server-based application, you have to make sure that a
couple of things are in place.
You've to create and setup your server, you've to install operating systems, install necessary
software, and, on ongoing basis, you also have to manage the server, manage the operating
systems, take care of the hardware upgrades, software updates, and so on.
You also have to make sure that your application is highly-available and fault-tolerant.
You might also need to have load-balancers in your applications.
And all this comes with added resources, added infrastructure, added costs.
Serverless Computing changes this paradigm altogether.
All the steps that we discussed just now, apart from writing your application code,
are no longer needed with serverless applications.
Serverless applications allow you to focus on your application logic without having to
worry about any servers.
There are no servers to maintain, no operating systems to take care of, no software to manage,
no hardware to upgrade.
And, your applications have built-in high-availability and fault-tolerance.
This simply means faster time to market.
You can really focus your energies on your core application logic and build your applications
with high-availability virtually at any scale, without having to worry about any servers
or operating systems.
Now let's look at the four main benefits of serverless computing.
First, as we discussed, there are no servers or operating systems to maintain.
You don't have to manage any servers or even have to install any operating systems or supporting
software.
Second, easy and efficient scaling.
Serverless applications can be scaled automatically or at the most with a few clicks to choose
your desired capacity.
There is no need to create any specialized scalable architecture or designs.
Third, high availability.
Serverless applications have built-in availability and fault tolerance.
So you don't need to have any specialized infrastructure to make your applications highly
available or fault tolerant.
All this is available to you by default.
Fourth, and this is a big one.
No idle capacity.
You pay only for what you use and no more.
For example, with traditional architecture, say you created a server with 100 GB of memory
and you're using only 10 GB of it.
But still, you'll have to pay for the 90 GB that you're not using.
But with serverless architecture, you pay only for what you use.
So if you're using 10 GB, you only pay for 10 GB.
Also, with AWS lambda which is the core component of Amazon's serverless platform, you pay only
for the time your code runs.
So there is no charge if your code is not running.
So if your code runs for say 100 milliseconds you are charged only for that 100 milliseconds
and no more.
That's really a very fine grained control and results in a substantial cost savings
for your business!
This brings us to the end of this section.
In this section, we looked at what serverless computing is, how is it different from the
traditional "server-based" computing and we also looked at the four main benefits of serverless
computing.
In the next section, we'll look at AWS serverless architecture and I'll also give you a quick
rundown on different web services that are part of Amazon's serverless platform.
So see you in the next section.
Thank you so much!
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