eBPF & Cilium Deep-Dive: In-Kernel Kubernetes Networking, Zero-Overhead Observability & Tetragon Security
Replacing iptables and kube-proxy with eBPF: kernel-level packet routing, sub-millisecond service mesh latencies, Hubble observability, and real-time Tetragon runtime security.
Sikander Ali
Senior DevOps Architect (CKA, Linux Kernel)
Executive Engineering Summary & Takeaways
- eBPF programs bypass Linux network stack overhead to route packets directly in the kernel, improving pod throughput by up to 300%.
- Cilium Hubble provides zero-overhead L3/L4/L7 flow observability without injecting heavy application sidecars.
- Tetragon executes in-kernel security enforcement, detecting and killing malicious shell spawning or privilege escalation instantaneously.
1. In-Kernel Packet Filtering vs. Legacy iptables
In large Kubernetes clusters with tens of thousands of services, iptables rules grow O(N) sequentially. Every network packet must traverse thousands of sequential filter rules, causing significant CPU overhead and jitter.
Cilium replaces iptables with eBPF hash tables operating directly at the socket layer (sockops) and XDP (eXpress Data Path). Packet lookup becomes O(1) instantaneous.
kubeProxyReplacement: "true"
k8sServiceHost: "127.0.0.1"
k8sServicePort: "6443"
routingMode: "native"
autoDirectNodeRoutes: "true"
bpf:
masquerade: "true"
tproxy: "true"
hubble:
enabled: true
relay:
enabled: true
ui:
enabled: true
metrics:
enabled:
- dns
- drop
- tcp
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