#5 – Traffic Not Reaching Service? Debug Like a Senior Engineer | Microservices Interview Question

Описание: Microservices Interview Questions for Senior Developers – Question 5

Scenario:
A microservice is deployed successfully, but traffic doesn’t reach it.

This is a classic production issue — and it tests real-world debugging skills.

In this video, we break down a systematic, layer-by-layer approach to debugging traffic issues in microservices environments.

You’ll learn how to investigate:

✔ Service health and readiness
✔ Service discovery registration
✔ Load balancer routing rules
✔ Health check configuration
✔ Network and security rules
✔ Client misconfiguration issues
✔ Port mismatches (very common!)
✔ Running vs Reachable distinction

This question isn’t about code.
It’s about production thinking.

If you're preparing for senior backend or system design interviews, this mindset is critical.

🔎 Topics Covered:
Kubernetes debugging basics
Health checks and readiness probes
Service discovery pitfalls
Load balancer routing issues
Network policies & firewalls
Production debugging strategy

🚀 These questions test:
Observability
Resilience
Failure handling
Real-world system design maturity

00:00 – Hook: Service Is Running… But No Traffic?!
00:40 – Why This Is a Senior-Level Production Question
01:20 – The 6-Layer Debugging Framework
02:10 – Step 1: Is the Service Actually Running?
03:10 – Step 2: Health Checks vs Running (Critical Difference)
04:20 – Step 3: Service Discovery Problems
05:30 – Step 4: Load Balancer & Routing Issues
06:40 – Step 5: Network / Security Blocks
07:40 – Step 6: Client Misconfiguration
08:40 – The Port Mismatch Trap (Very Common)
09:30 – Structured Debugging Checklist (Outside → Inside)
10:20 – Prevention: How Senior Engineers Avoid This
10:50 – Final Production Mindset Takeaway


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