Reflections on Tetragon for the year 2025...

Cilium is an innovative open-source project that redefines networking and security for containerized applications. By leveraging the power of eBPF (extended Berkeley Packet Filter), Cilium provides efficient networking and transparent security capabilities for modern cloud-native environments. Readers exploring Cilium can gain insights into advanced networking concepts, such as service mesh architectures, network policy enforcement, and distributed application security.

cilium

Tetragon, an eBPF-powered runtime security tool, achieved significant milestones in 2025 including Windows support preview, persistent enforcement during agent failures, flexible enforcement modes for testing policies, attribute resolution for easier policy writing, and userspace hooks (uprobes/USDTs) for application-level visibility. The community grew through conference talks, user stories from production deployments, and technical blog posts demonstrating real-world adoption in Kubernetes clusters and cloud-native environments.

Tetragon: An End-of-Year 2025 Reflection

Flexible Enforcement Modes for Tracing Policies