Portal | Level: L2: Operations | Topics: Kubernetes Networking, Linux Networking Tools | Domain: DevOps & Tooling

Symptoms: Service Mesh 503s, Envoy Misconfigured, Root Cause Is RBAC Policy

File	Purpose
symptoms.md	Problem statement and observable symptoms
questions.md	Diagnostic questions to work through
investigation.md	Full investigation path across domains
remediation.md	Cross-domain fix and verification
grading.md	Self-assessment rubric

Cross-domain incident study — see cross-domain index for context.

Pages that link here

• API Gateways & Ingress - Primer
• ARP Flux / Duplicate IP
• Cilium & eBPF Networking - Primer
• Cross-Domain Incident Case Studies
• DHCP Not Working on Remote VLAN
• Grading Rubric
• Jumbo Frames Enabled But Some Paths Failing
• Kubernetes Networking
• Kubernetes Networking - Primer
• Kubernetes Services & Ingress - Primer
• Linux Network Packet Flow
• Ops Archaeology: The Requests That Vanish
• Primer
• Production Readiness Review: Study Plans
• Runbook: Ingress 502 Bad Gateway

---

Wiki Navigation

Prerequisites

• Kubernetes Ops (Production) (Topic Pack, L2)

Related Content

• Deep Dive: Kubernetes Networking (deep_dive, L2) — Kubernetes Networking, Linux Networking Tools
• Ops Archaeology: The Requests That Vanish (Case Study, L2) — Kubernetes Networking, Linux Networking Tools
• API Gateways & Ingress (Topic Pack, L2) — Kubernetes Networking
• Case Study: API Latency Spike — BGP Route Leak, Fix Is Network ACL (Case Study, L2) — Linux Networking Tools
• Case Study: ARP Flux Duplicate IP (Case Study, L2) — Linux Networking Tools
• Case Study: CNI Broken After Restart (Case Study, L2) — Kubernetes Networking
• Case Study: Canary Deploy Routing to Wrong Backend — Ingress Misconfigured (Case Study, L2) — Kubernetes Networking
• Case Study: CoreDNS Timeout Pod DNS (Case Study, L2) — Kubernetes Networking
• Case Study: DHCP Relay Broken (Case Study, L1) — Linux Networking Tools
• Case Study: Duplex Mismatch Symptoms (Case Study, L1) — Linux Networking Tools