OpenStack Explained: Building Your Own AWS : Part 1

If you’ve spent any time learning cloud computing, you’ve almost certainly come across AWS, Azure, or Google Cloud. Need a virtual machine? Click a button. Need storage? Create a bucket. Need a private network? A few clicks and you’re done.

It’s easy to take all of that for granted.

I remember thinking that cloud providers were somehow “magic.” You requested a virtual machine, and a few moments later it was running. Storage appeared instantly. Networks were created automatically. It all felt effortless.

Then I stumbled across OpenStack.

At first, I assumed it was just another virtualization tool. Maybe something like VMware or Proxmox. But the more I learned, the more I realized I was looking at something much bigger.

OpenStack isn’t another cloud provider.

It’s the software that lets companies build a cloud of their own.

Once that clicked, a lot of other technologies suddenly made more sense.

Imagine AWS Didn’t Exist

Let’s start with a simple question.

Imagine you’re running a company with thousands of employees and hundreds of physical servers sitting in your own data center.

Different teams need infrastructure every day.

• The development team wants Ubuntu virtual machines.
• The QA team needs isolated testing environments.
• The data science team requires GPU-enabled servers.
• The networking team wants complete control over routing and firewalls.

Without a cloud platform, every request becomes a manual process.

Someone has to:

• Pick a physical server
• Install the operating system
• Configure networking
• Allocate storage
• Create user accounts
• Set up security policies

Now imagine doing that hundreds of times every week.

It doesn’t scale.

This is exactly the problem cloud computing solved.

AWS automated these tasks so developers could provision infrastructure themselves instead of waiting for system administrators.

But here’s another question.

What if you’re not allowed to use AWS?

Many organizations simply can’t.

Banks often have strict compliance requirements. Government agencies may require sensitive data to remain inside their own facilities. Telecom companies already own massive data centers and don’t want to migrate everything to a public cloud.

They still need cloud-like capabilities.

That’s where OpenStack comes in.

So What Exactly Is OpenStack?

The simplest way I can describe OpenStack is this:

OpenStack is open-source software that allows companies to build and operate their own cloud platform.

Think about what AWS provides:

• Virtual Machines
• Storage
• Networking
• User management
• Security groups
• Dashboards
• APIs

OpenStack provides those same building blocks.

The difference is that instead of running inside Amazon’s data centers, OpenStack runs inside yours.

You own the hardware.

You install OpenStack.

Your employees consume infrastructure through it, just as they would with AWS.

That’s why people often describe OpenStack as “building your own AWS.”

It’s not a perfect comparison, but it’s a great mental model for beginners.

Public Cloud vs Private Cloud

This is where many people get confused.

Let’s compare them.

Public Cloud

When you use AWS, Azure, or Google Cloud:

• Someone else owns the hardware.
• Someone else replaces failed disks.
• Someone else upgrades networking equipment.
• Someone else patches the infrastructure.

You simply rent resources.

It’s similar to staying in a hotel.

You don’t own the building.

You simply book a room when you need one.

Private Cloud

OpenStack works differently.

Your company owns:

• The servers
• The networking equipment
• The storage systems
• The data center

OpenStack sits on top of that hardware and turns it into a cloud platform.

Now your internal developers can create virtual machines with the same self-service experience they’d get from AWS.

Think of it as building and managing your own hotel instead of renting a room in someone else’s.

The responsibility is greater, but so is the control.

Why Would Anyone Do That?

This is probably the biggest question beginners ask.

“If AWS already exists, why would anyone spend so much effort running OpenStack?”

The answer usually comes down to one or more of these reasons.

1. Compliance

Some industries simply cannot store sensitive information on a public cloud.

• Healthcare organizations.
• Banks.
• Government agencies.
• Defense contractors.

Certain regulations require data to remain under the organization’s direct control.

2. Existing Infrastructure

Large enterprises have often invested millions of dollars into their own data centers.

Walking away from that investment doesn’t make financial sense.

Instead, they modernize it with OpenStack.

3. Cost at Massive Scale

For small companies, AWS is usually cheaper.

For organizations operating tens of thousands of servers around the clock, owning the infrastructure can become more economical over the long term.

This isn’t true for every company, but at a very large scale, the economics can shift.

4. Complete Control

Some organizations need full control over:

• Hardware selection
• Network architecture
• Storage technologies
• Security policies
• Upgrade schedules

Public cloud providers intentionally abstract much of this away.

With OpenStack, you decide how everything is configured.

Is OpenStack a Hypervisor?

This confused me when I first started learning it.

The answer is no.

OpenStack does not create virtual machines by itself.

Instead, it coordinates other technologies that do.

Most commonly, it works with KVM, although it can integrate with other hypervisors as well.

Think of it like this.

The hypervisor is the engine.

OpenStack is the driver.

OpenStack decides:

• Where a virtual machine should run
• Which network it should use
• How much storage it gets
• Which user can access it

The hypervisor actually creates and runs the virtual machine.

Understanding this distinction makes many OpenStack concepts much easier to grasp.

In the next section, we’ll dive into the core OpenStack services — Nova, Neutron, Keystone, Glance, Cinder, Swift, Horizon, and Heat — and see how they work together to provide a complete cloud platform.