What is OpenStack and How It Works? Key Components & Uses

What is OpenStack in Cloud Computing?

OpenStack is an open-source cloud operating system that provides infrastructure-as-a-service (IaaS) for both public cloud and private cloud. It manages vast amounts of computing, storage, and networking resources in data centers, allowing businesses to deploy virtualized resources such as OpenStack virtual machines (VMs), containers, and bare-metal hardware via APIs, web-based dashboards, or command-line tools.

Unlike traditional virtualization that relies on hypervisors, OpenStack uses APIs to abstract hardware resources, enabling direct interaction between users, administrators, and cloud services.

OpenStack cloud platform’s architecture supports multi-vendor hardware pools, making it highly versatile and vendor-independent. This open-source platform has grown from a simple compute management tool into a complete cloud infrastructure solution that businesses can customize to their specific needs. As of 2024, over 45 million OpenStack cores are running in production environments, demonstrating its widespread adoption and reliability.

How Does Openstack Work?

Understanding what is OpenStack and how it works starts with its modular architecture where each component communicates through REST APIs to provision and manage cloud resources on demand. Here is a step-by-step overview of how OpenStack processes a typical cloud resource request:

User Request

Users initiate requests to create or manage resources (e.g., virtual machines, networks) through the Horizon dashboard or via APIs.

Authentication

All requests are authenticated through Keystone, the identity service. Keystone verifies user credentials and assigns roles and permissions.

Resource Provisioning

Once authenticated, the request is assigned to the relevant OpenStack services based on what resource is being created. Nova receives compute requests and selects the most appropriate hypervisor to host the new virtual machine. Simultaneously, Neutron configures the required virtual networks and subnets, while Cinder or Swift provisions the requested storage volumes or object storage, all coordinated automatically without manual intervention.

Instance Launch

Once all components are configured, Nova launches the instance on the selected hypervisor, integrating it with the requested networking and storage services.

Monitoring and Management

After provisioning, OpenStack uses telemetry services like Ceilometer to monitor resource usage and performance metrics. Administrators can manage instances through Horizon or CLI tools, adjusting resources as needed.

Orchestration and Scaling

For more complex deployments involving multiple interconnected services, OpenStack’s Heat orchestration engine allows administrators to define entire infrastructure stacks as code using YAML templates. When traffic spikes or workload demands increase, OpenStack can automatically scale resources up or down based on predefined policies, adding new instances, expanding storage, or increasing network capacity without manual effort. This combination of orchestration and auto-scaling makes OpenStack suitable for enterprise production environments where workloads change frequently and rapidly.

What is OpenStack Architecture in Cloud Computing?

OpenStack architecture in cloud computing is a modular design; it is built from separate, independent services that each handle one specific job. Instead of one huge system doing everything, OpenStack breaks cloud computing into smaller specialized pieces that work together through a common communication layer called REST APIs.
Think of it like a well-organized office: the receptionist (Keystone) handles identity and access, the project manager (Nova) assigns compute tasks, the network team (Neutron) manages connectivity, and the storage department (Cinder/Swift) handles files and data. Each team works independently but communicates with others whenever needed to complete a task.

The architecture has three core layers that work together:

Compute Layer

The compute layer, powered by Nova, is where virtual machines are created and managed. When a user requests a new server or application environment, Nova selects the right physical host, provisions the virtual machine, and assigns it the requested CPU and RAM resources. This layer is the engine of OpenStack, responsible for all the actual processing power your cloud workloads run on.

Network Layer

The network layer, managed by Neutron, connects all virtual machines and cloud resources to each other and to the outside world. It creates virtual networks, assigns IP addresses, manages firewalls, and controls traffic routing all through software rather than physical cables. This software-defined networking approach makes it easy to reconfigure connectivity instantly without touching any physical hardware.

Storage Layer

The storage layer handles two types of data storage: block storage through Cinder for structured data like databases and virtual machine disks, and object storage through Swift for large unstructured data like images, backups, and media files. Both storage services are distributed across multiple physical drives, ensuring data is never lost if one drive fails. The storage layer scales independently from compute and networking, so businesses can add storage capacity without changing anything else in the architecture.

How All Layers Connect?

All three layers communicate through Keystone OpenStack’s identity service, which authenticates every request before it reaches any other component. Horizon provides the web dashboard that sits on top of all layers, giving administrators a single interface to manage compute, network, and storage resources without writing any code. This connected modular design is what makes OpenStack architecture so powerful; each layer can be scaled, updated, or replaced independently without disrupting the rest of the system.

What are the OpenStack Features?

Below are some of the top features of openstack:

Open Source

The software is open source and vendor neutral. This ensures that it is free from any vendor lock-in and the community of developers can freely view, alter, and contribute to its code.

Modular Architecture

OpenStack’s structure allows for the independent development, operation, and deployment of different modules. These modules are combined together to form a cloud ecosystem.

Multi-tenancy and Identity Management

This allows for provisioning cloud resources securely while also supporting authentication and role-based access control.

Distributed Architecture

OpenStack has a distributed design which allows users to scale the infrastructure horizontally by utilizing several physical servers which enhances the framework’s ability to handle heavy workloads while still maintaining a good performance.

API-Driven Design

Each component in OpenStack can be controlled using a set of APIs. This feature allows the management process to be automated and integrated with other systems with ease.

Web-Based Dashboard

The framework provides a dashboard which enables users to manage their cloud platform through a web interface which is more intuitive and does not require extensive technical expertise.

Resource Pooling

In this feature, the infrastructure components such as the computing resources, storage, and network are virtualized and pooled to form a collective resource. These resources can then be allocated or released to meet specific demands.

Who Uses Openstack?

Below are the common end-users of OpenStack:

Telecommunications Companies

The main players of the telecom industry, such as AT&T, Deutsche Telekom, China Mobile, and others utilize OpenStack in order to create the core infrastructure for the implementation of Network Functions Virtualization (NFV).

Cloud Service Providers

These providers use this platform to build their own cloud infrastructure and offer their services as an alternative to Amazon Web Services and Microsoft Azure.

Research Institutes and Universities

CERN is one of the key users of OpenStack who uses it to operate one of the largest information infrastructure.

Enterprises with Private Clouds

Some companies have their own software-defined data centers and prefer to use the OpenStack platform to host applications instead of using public clouds.

Government Agencies

Government organizations prefer to use this infrastructure because it is based on open-source technologies and offers better control over data and privacy.

What are the Key OpenStack Components?

OpenStack is a large open-source project, and there are many separate components in this project such as:

Compute (Nova)

As the most basic and, at the same time, the most complex component of OpenStack, Nova communicates with virtualization tools and manages the creation, management, and removal of virtual machines via API. Nova components run in the background on Linux servers, helping virtualization technologies such as KVM, Vmware, Xen and Hyper-v, Linux container technologies such as LXC and LXD, and other OpenStack components to perform their tasks.

Object Storage (Swift)

Swift, the object storage component of OpenStack, is a scalable and distributed storage system. You can store your files, videos, images, virtual machine backups, and other unstructured data in Swift. With the help of the Swift API, you can send or receive data over HTTP. Swift ensures that it stores the copies when storing the data, thus preventing data loss by using the copied versions when a problem occurs in the servers.

Block Storage (Cinder)

Cinder is the block storage service of OpenStack, providing virtual storage for virtual machines in the system. These virtual storage areas are kept separate from the servers to protect data even when the server is deleted. Users can add or expand new disk space to virtual machines running on the Horizon interface.

Image Service (Glance)

Glance, the image service of OpenStack, provides the management of disk images. These images are used as templates for newly installed servers. Glance also receives backups of servers, and it can create new servers with received copies. It can back up different types of storage but generally uses OpenStack Object Storage. Glance service supports raw, aki, ami, ari, iso, qcow2, vhd, vdi, vmdk, ovf image formats.

Identity Service (Keystone)

Keystone is the authentication and authorization system of OpenStack. All OpenStack components use Keystone service to query which users are authorized to use the cloud services. The Keystone unit supports many methods, including username and password information or token-based authentication, to verify credentials. It can be integrated with systems like LDAP.

Dashboard (Horizon)

The Horizon service provides a web-based user interface for many operations. This interface makes it easy to create instances, security settings, network settings, etc. It assists service providers and other commercial vendors with third-party services such as monitoring, billing, and administration tools. Developers may automate OpenStack resource management tools using either the EC2 compatibility API or the original OpenStack API.

Networking (Neutron)

Neutron is the network service within OpenStack. It enables the management of the virtual network structure in the cloud (such as subnets, routers, firewalls, IDS VPNs). With Neutron, users can create their networks and connect different networks. Developers can implement SDN technology to achieve high degrees of multi-tenancy and huge scalability.

Neutron also provides an extension architecture that allows for the deployment and management of various network services such as virtual private networks.

Data Collection (Ceilometer)

Ceilometer allows the collection of data generated by OpenStack services. These data can be used for processes such as customer invoicing and system monitoring. Developers can collect data by monitoring notifications from existing services and configuring the type of data to match their operational needs.

What are the OpenStack Pros and Cons?

Here the list of advantages and disadvantage of openstack:

Advantages of OpenStack

1. Open Source and Affordable

In contrast to other cloud platforms, OpenStack does not require paying for software licenses. Moreover, it is possible to use commodity hardware, which reduces the overall cost.

2. Horizontal Scalability

The platform allows horizontal scaling, making it possible to implement a cluster with thousands of nodes.

3. Multi-Tenancy and Security

Built-in mechanisms for restricting access to specific parts of the system make it possible to provide each tenant with special rights.

4. Hosting on Two Types of Platforms

The ability to host applications on-premises or in the cloud makes it possible to exclude the single point of failure.

5. Running on Any Hardware

The project allows utilizing any hypervisors and storage. Thus, there is an opportunity to avoid dependence on a particular hardware supplier.

6. Tools for Automation and Programming

All components have a REST API, allowing their automation and integration into various systems. Additionally, there are many utilities for working with OpenStack, such as Ansible, Heat, and Terraform.

Disadvantages of OpenStack

1. The Problem of Complexity

In practice, this cloud platform is not as simple as it seems at first glance. A competent implementation requires highly qualified specialists.

2. Performance Issues

This cloud platform is not as efficient as it is claimed. In practice, when using this solution, there is often extra overhead compared to proprietary virtualization software.

3. Lack of Managed Offerings

Unlike AWS, Azure, or Google Cloud, OpenStack lacks managed database services, machine learning, or serverless computing options. Thus, companies utilizing OpenStack must maintain their own set of programs and tools.

4. Slow Development and Implementation of Updates

The updates to the components may come infrequently due to the open-source nature of the project. This problem is exacerbated by the fact that developers from different companies work on the project, which complicates unifying the development.

5. Support Costs

Although the software itself is free, maintaining an on-premises data center requires budgeting. In addition, companies often resort to purchasing commercial licenses for specific vendors’ products or solutions from third parties, which can also be expensive.

Conclusion

OpenStack is a game changer for businesses, providing exceptional scalability and flexibility to meet changing demands. Its open-source platform offers businesses the ability to create cost-effective, secure, and configurable cloud environments, resulting in greater innovation and operational efficiency. OpenStack’s broad expansion capabilities enable organizations to effortlessly adapt to expansion, maximize resource use, and remain competitive in a constantly changing technological environment.

FAQs

What are the primary uses of OpenStack?

OpenStack is used to manage and automate cloud resources like compute, storage, and networking. It helps organizations build scalable public, private, or hybrid cloud environments and supports multi-tenancy and application hosting.

Who uses OpenStack?

OpenStack is used by businesses, government organizations, telecommunications companies, cloud service providers, and research institutions. Companies like AT&T, PayPal, and CERN rely on OpenStack for their cloud infrastructure.

What is an open-source cloud operating system?

An open-source cloud operating system is a free, collaborative software platform that manages cloud resources. OpenStack is a leading example, enabling users to deploy and operate scalable cloud environments.

What is an OpenStack platform provider?

An OpenStack platform provider offers services, tools, and support to help organizations implement, deploy, and manage OpenStack-based cloud solutions. Providers ensure optimized and seamless OpenStack integration.

Who are some well-known OpenStack platform providers?

Major OpenStack platform providers include Red Hat OpenStack, Canonical (Ubuntu OpenStack), Mirantis, and SUSE OpenStack Cloud, offering enterprise-grade tools and support.

What is OpenStack used for?

OpenStack is used for building and managing private, public, and hybrid clouds. It supports virtualization, container orchestration, software-defined networking, and storage, enabling cost-effective and scalable cloud solutions.

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