Cilium & Hubble: How eBPF Is Replacing kube-proxy in Modern Kubernetes

Cilium & Hubble: The eBPF-Powered Nervous System of Your Kubernetes Cluster How modern Kubernetes networking is moving into the kernel — and why it matters for performance, security, and observability. Introduction If your Kubernetes cluster is still relying on iptables and kube-proxy, you’re paying a hidden tax — in latency, scalability, and visibility. Cilium replaces that entire model with eBPF, moving networking, security, and observability directly into the Linux kernel. Paired with Hubble, it gives you real-time insight into every packet flowing through your cluster — without sidecars, instrumentation, or application changes. This isn’t just an incremental improvement. It’s a fundamental shift in how Kubernetes networking works. Why Teams Are Switching to Cilium Performance at Scale Eliminates iptables rule traversal Kernel-level packet processing reduces latency Constant-time lookups even with thousands of services Built-in Security Native L3/L4 policy enforcement Identity-aware