Service Mesh Troubleshooting & Diagnostics
Debug service mesh traffic, policies, and performance issues systematically
What You Can Do
You can diagnose and resolve service mesh problems by analyzing control plane state, interpreting data plane metrics, and evaluating network policies. Claude helps you trace traffic flow issues, identify performance bottlenecks, detect policy conflicts, and pinpoint root causes using structured diagnostic workflows that combine cluster state analysis with behavioral inspection.
Features
Parse Istio/Linkerd configuration to detect malformed policies and routing mismatches
Follow packet paths through your mesh to identify where traffic breaks or routes unexpectedly
Verify mutual TLS, RBAC, and authorization policies are enforced correctly
Correlate Envoy metrics, load balancer behavior, and pod resources to find latency sources
Reference known problems (retry storms, circuit breaker thrashing, DNS loops) and proven fixes
Identify overlapping or contradictory rules that cause unexpected behavior
Debug uneven traffic distribution and algorithm misconfiguration
Translate raw Prometheus/Envoy stats into actionable insights
Example Output
Example 1: Traffic Routing Failure
✓ Diagnosis: VirtualService misconfiguration
- Destination rules reference non-existent service subset
- Fix: Update subset names to match DestinationRule definitions
- Expected outcome: Traffic routes to healthy backends after 30s propogation
Example 2: High Latency Investigation
✓ Root cause identified: Retry storm
- Policy retries failed requests 5x, amplifying 100ms latency → 500ms observed
- Connections: 10 concurrent retries × 50ms per attempt = 500ms user-visible delay
- Recommendation: Reduce
maxRetries: 3, add jitter backoff
Example 3: mTLS Connection Refused
✓ Policy check: AuthorizationPolicy denies namespace traffic
- Sender pod (namespace: dev) lacks required label
traffic: allowed - Fix: Add label to pod or modify policy selector to
namespaceSelector: dev - Test: Retry connection after 10s for label propagation
What's Included
- SKILL.md: Structured troubleshooting workflows for traffic, policies, and performance
- Control Plane State Analyzer: Template to inventory VirtualServices, DestinationRules, AuthorizationPolicies, and detect conflicts
- Data Plane Behavior Checklist: Step-by-step inspection of Envoy config, metrics, and connection logs
- Network Policy Validation Template: mTLS readiness, RBAC rule audit, and cross-namespace access verification
- Performance Profiling Worksheet: Correlate CPU/memory/latency across pods and identify bottlenecks
- Common Issues & Fixes Reference: 15+ diagnosed problems with root causes and resolutions
- Metrics Interpretation Guide: Decode Prometheus/Envoy stats (connection timeout, retry count, routing errors)
Who It's For
- Platform engineers responsible for service mesh reliability and configuration
- SRE/DevOps engineers troubleshooting production incidents and cluster stability
- Kubernetes operators managing mesh upgrades and policy enforcement
- Network engineers debugging traffic routing and load balancing
- Microservices architects validating mesh behavior during design and deployment
Best For
- Traffic routing failures and circuit breaker thrashing — Diagnose why traffic doesn't reach intended services or keeps failing
- Mutual TLS and authorization policy issues — Verify encrypted communication and RBAC rules are enforced correctly
- Latency and performance bottlenecks — Correlate metrics to find if delays originate in mesh, application, or infrastructure
- Load balancing misconfiguration — Debug uneven traffic distribution and connection pooling issues
- Service discovery and DNS failures — Trace hostname resolution and sidecar readiness problems
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