Which platform is an open source cloud computing and IaaS solution for private and hybrid clouds?

The correct answer is OpenStack, which is a prominent open-source software platform specifically designed for cloud computing and infrastructure as a service (IaaS) solutions. OpenStack enables users to deploy and manage large pools of compute, storage, and networking resources throughout a datacenter, allowing them to build private and public clouds effectively.

OpenStack's architecture lets a diverse array of applications run on it, providing flexibility and scalability that are essential for organizations adopting cloud models. Its community-driven nature means it has robust support, and it continuously evolves with contributions from various organizations. This makes it a preferred choice for building both private and hybrid clouds.

In contrast, while Eucalyptus is another open-source platform aimed at creating cloud computing environments, it is less commonly used than OpenStack and has a more limited scope. Cloud Foundry is primarily focused on application development and deployment rather than managing infrastructure resources. Docker is a containerization technology that enables the deployment of applications in isolated environments but does not serve as an IaaS solution for managing the underlying infrastructure like OpenStack does.