Q: What is eBPF and how is it used in Kubernetes networking?
Extended Berkeley Packet Filter — runs sandboxed programs in the Linux kernel. In K8s: Cilium uses eBPF instead of iptables for service r...
#Kubernetes #Additional Kubernetes Scenarios (Q101-Q200) #L3 #Container Orchestration #K8s
🎙️ Candidate Opening & Architectural Context
""In our production Kubernetes clusters running microservices on EKS/AKS, this was a classic operational challenge. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Production Solution & Architecture
Extended Berkeley Packet Filter — runs sandboxed programs in the Linux kernel. In K8s: Cilium uses eBPF instead of iptables for service routing. Benefits: much faster (kernel bypass for Service lookup), better observability (Hubble), network policy at L7. Becoming the modern replacement for iptables-based kube-proxy.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Extended Berkeley Packet Filter — runs sandboxed programs in the Linux kernel. In K8s: Cilium uses eBPF instead of iptables for se."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Extended Berkeley Packet Filter — runs sandboxed programs in the Linux kernel. In K8s: Cilium u
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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