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eBPF in Kubernetes: The Technology Behind Modern Networking
I wrote “eBPF in Kubernetes: The Technology Behind Modern Networking” to share practical, production-minded guidance on this topic.
Understanding eBPF
eBPF programs run in a sandboxed virtual machine within the Linux kernel, processing events without kernel modifications.
// Simple eBPF program example
SEC("xdp")
int xdp_drop_all(struct xdp_md *ctx) {
return XDP_DROP; // Drop all packets
}
eBPF Use Cases in Kubernetes
- Networking: Replace iptables with faster eBPF rules
- Security: Syscall filtering, runtime security
- Observability: Kernel-level tracing
- Load Balancing: Efficient service routing
Kubernetes Components Using eBPF
- Cilium CNI
- Calico eBPF mode
- Falco runtime security
- Pixie observability
Performance Benefits
# Compare iptables vs eBPF
# iptables: O(n) rule matching
# eBPF: O(1) hash-based lookup
Summary
eBPF enables next-generation Kubernetes infrastructure with improved performance, security, and observability at the kernel level.