What technology is commonly used to manage clusters of containers?

Kubernetes is a powerful orchestration platform specifically designed to manage clusters of containers. It automates the deployment, scaling, and operation of application containers across clusters of hosts. Kubernetes simplifies container management by providing essential capabilities such as load balancing, scaling applications up or down based on demand, and facilitating updates without downtime. Its architecture allows it to manage complex containerized applications efficiently and provides a rich ecosystem of tools and services that enhance operational efficiency.

While Docker Swarm is another container orchestration tool, it is often considered simpler and less feature-rich compared to Kubernetes. OpenStack, on the other hand, is primarily an Infrastructure as a Service (IaaS) cloud computing platform, and VirtualBox is a type-2 hypervisor used primarily for running virtual machines rather than managing container clusters. Therefore, Kubernetes stands out as the most widely adopted and robust solution for container management within clusters, making it the best choice in this context.