OpenStack — Open Source Cloud Computing Infrastructure Platform

Introduction

OpenStack is the leading open-source platform for building cloud infrastructure. Originally launched by NASA and Rackspace in 2010, it provides a set of interoperable services for compute, storage, networking, and identity that power some of the largest private and public clouds in the world.

What OpenStack Does

• Nova provisions and manages virtual machines and bare-metal servers at scale
• Neutron provides software-defined networking with routers, subnets, floating IPs, and security groups
• Cinder delivers persistent block storage volumes that attach to compute instances
• Swift offers highly available distributed object storage compatible with the S3 API
• Keystone handles identity, authentication, and service catalog for all OpenStack components

Architecture Overview

OpenStack follows a shared-nothing, service-oriented architecture. Each project (Nova, Neutron, Cinder, etc.) runs as an independent service with its own API, database, and message queue consumers. Services communicate asynchronously via RabbitMQ or another AMQP broker. The Keystone identity service provides centralized authentication and a service catalog. All APIs are RESTful, and the Horizon project provides a web-based dashboard for administration.

Self-Hosting & Configuration

• Use DevStack for development and testing on a single machine with ./stack.sh
• Deploy production environments with Kolla-Ansible (containerized) or TripleO for large-scale installations
• Configure services through INI-style config files (nova.conf, neutron.conf) in /etc/{service}/
• Set up high availability with HAProxy, Pacemaker, and Galera for database clustering
• Use Ceph as a unified storage backend for block (Cinder), object (Swift-compatible), and image (Glance) storage

Key Features

• Modular architecture allows deploying only the services you need
• Proven at massive scale, powering clouds with thousands of compute nodes
• Extensive API coverage with SDKs in Python, Go, Java, and other languages
• Multi-tenancy with project-level isolation, quotas, and role-based access control
• Vendor-neutral governance through the OpenInfra Foundation with contributions from hundreds of organizations

Comparison with Similar Tools

• AWS / Azure / GCP — public cloud providers with proprietary APIs; OpenStack provides equivalent functionality that runs on your own hardware
• Apache CloudStack — an alternative open-source cloud platform with a simpler architecture; OpenStack has a larger ecosystem and community
• Proxmox VE — a hypervisor management platform for VMs and containers; OpenStack provides full cloud infrastructure including SDN and object storage
• Kubernetes — container orchestration platform; OpenStack manages the underlying infrastructure (VMs, networks, storage) on which Kubernetes clusters can run

FAQ

Q: Is OpenStack suitable for small deployments? A: Yes, but it has operational complexity. For smaller setups, consider MicroStack or DevStack. OpenStack shines at medium to large scale.

Q: How does OpenStack compare to Kubernetes? A: They complement each other. OpenStack provides IaaS (virtual machines, networks, storage) while Kubernetes provides container orchestration. Many organizations run Kubernetes on top of OpenStack.

Q: What is the easiest way to try OpenStack? A: Use DevStack on a single machine with at least 8GB RAM. It sets up a complete development environment in about 30 minutes.

Q: Who uses OpenStack in production? A: Major users include CERN, Walmart, Bloomberg, and many telecom providers. It powers infrastructure for scientific computing, enterprise private clouds, and edge deployments.

Sources

• https://github.com/openstack/nova
• https://www.openstack.org