Cilium

Cilium is an eBPF-based Kubernetes networking and security plugin providing connectivity, policy enforcement, and observability.

What is Cilium?

Cilium is an eBPF-based Kubernetes networking and security plugin providing connectivity, policy enforcement, and observability. It is part of the practical vocabulary used by administrators, developers and IT teams. Understanding it helps identify where the technology sits in an architecture and what problem it is intended to solve.

What is it used for?

It is mainly used to provide a CNI, enforce NetworkPolicy, and observe network flows in Kubernetes clusters. In production, its usefulness depends on the surrounding configuration, compatibility requirements and operational constraints.

How to recognize it in practice

You may encounter Cilium in product interfaces, configuration files, logs, API documentation, network diagrams or troubleshooting procedures. Always check the context before changing a setting based only on its name.

Points to watch

Advanced features depend on the Linux kernel, Kubernetes version, and a coherent network design. Test changes, document the previous state and keep a rollback path for production systems.

In short

Cilium = an eBPF-based Kubernetes networking and security plugin providing connectivity, policy enforcement, and observability. Its main value is to provide a CNI, enforce NetworkPolicy, and observe network flows in Kubernetes clusters.