Notes

30. Debugging Workflow (GET → DESCRIBE → LOGS → EXEC)

3 min read

🧠 Concept 19: Troubleshooting (Debugging Kubernetes like a PRO 💯🔥)

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🚀 1. Core Idea (1-line)

👉 Troubleshooting in Kubernetes = systematically finding where the chain is broken

🧠 2. Golden Rule (VERY IMPORTANT 🔥)

👉 Always debug in this order:

Pod → Container → Node → Service → Network → Config

⚙️ 3. Step-by-Step Debugging Flow (CKA GOLD 🔥)

🟢 Step 1: Check Pod Status

kubectl get pods

Look for:

  • CrashLoopBackOff 💀

  • Pending ⏳

  • ImagePullBackOff 📦

🔍 Step 2: Describe Pod (MOST IMPORTANT 🔥)

kubectl describe pod <name>

👉 Shows:

  • Events

  • Scheduling issues

  • Errors

📜 Step 3: Check Logs

kubectl logs <pod>

👉 For multi-container:

kubectl logs <pod> -c <container>

🖥️ Step 4: Exec into Pod

kubectl exec -it <pod> -- /bin/bash

👉 Check:

  • Files

  • Env variables

  • App behavior

⚠️ 4. Common Errors & Fixes (VERY IMPORTANT 🔥)

💀 CrashLoopBackOff

👉 Causes:

  • App crash

  • Wrong config

👉 Fix:

  • Check logs

  • Fix env/config

📦 ImagePullBackOff

👉 Causes:

  • Wrong image name

  • Private repo

👉 Fix:

  • Correct image

  • Add imagePullSecrets

⏳ Pending Pod

👉 Causes:

  • No resources

  • Node constraints

👉 Fix:

  • Check:
kubectl describe pod <name>

💀 OOMKilled

👉 Cause:

  • Memory limit exceeded

👉 Fix:

  • Increase memory limit

🌐 5. Service Debugging

kubectl get svc
kubectl describe svc <name>

Check:

  • Selector matches pods ❗

🔗 6. Networking Debug

Inside pod:

curl <service-name>
ping <service-name>

👉 If fails:

  • DNS issue

  • Service issue

🧠 7. Node-Level Debug

kubectl get nodes
kubectl describe node <node>

Check:

  • Resource pressure

  • Node status

📊 8. Events (VERY IMPORTANT 🔥)

kubectl get events

👉 Shows cluster-level issues

💥 9. Real-world Debug Example (🔥)

Problem:
👉 ML API not responding

Debug:

  1. Pod running?

  2. Logs show error?

  3. Service connected?

  4. Ingress routing correct?

👉 Find break in chain

⚠️ 10. Common Mistakes

❌ Jumping to conclusions
❌ Not checking describe
❌ Ignoring events

💼 11. Interview Answer

👉 “Kubernetes troubleshooting involves systematically analyzing pods, logs, events, and cluster components using tools like kubectl describe, logs, and exec to identify and resolve issues.”

⚡ 12. MUST KNOW Commands (CKA 💯)

kubectl get all
kubectl describe <resource>
kubectl logs <pod>
kubectl exec -it <pod> -- sh
kubectl get events

🧠 13. Memory Trick

👉 GET → DESCRIBE → LOGS → EXEC 🔍

🔥 14. Pro Insight (REAL DEVOPS 🔥)

👉 90% issues solved by:

  • describe

  • logs

👉 Master these = you’re dangerous 💯

🎯 You’re Done with CORE KUBERNETES 🔥

Bhai honestly:

👉 You now understand:

  • Architecture ✅

  • Workloads ✅

  • Networking ✅

  • Storage ✅

  • Security ✅

  • Scaling ✅

  • Debugging ✅

👉 This is job-ready + CKA foundation level 💯

🚀 What Next (Important Decision)

Now don’t stop here. Choose path:

🔥 Option 1: Hands-on Real DevOps (BEST for you 👀)

I’ll simulate:

  • Production issues

  • YAML writing

  • Debugging scenarios

🔥 Option 2: CKA Crack Strategy

  • Labs

  • Exam tricks

  • Time management

🔥 Option 3: Interview Prep (Top MNC / Startup)

  • Questions

  • System design

  • Scenarios

Just tell me 👇
👉 hands-on / cka / interview

I’ll take you to next level 🚀

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