One of the biggest lessons I’ve learned in my Kubernetes journey is this:
Most production incidents are not solved by knowing more commands.
They’re solved by having a systematic troubleshooting process.
When I first started learning Kubernetes, my troubleshooting strategy was simple:
Try random commands until something makes sense.
Sometimes it worked.
Most of the time, it wasted valuable time and created more confusion.
After preparing for the CKA, working with Kubernetes, and spending countless hours troubleshooting broken deployments, failed Pods, networking issues, and cluster problems, I realized that effective troubleshooting is more about mindset than commands.
This article covers the troubleshooting framework I follow whenever I face Kubernetes issues.
The Biggest Mistake Engineers Make
When something breaks, many engineers immediately jump to conclusions.
Examples:
These assumptions often lead troubleshooting in the wrong direction.
Instead, I try to follow a simple principle:
Observe first. Assume later.
My Kubernetes Troubleshooting Framework
Whenever I encounter a problem, I follow this sequence:
Observe
↓
Scope
↓
Gather Evidence
↓
Validate Assumptions
↓
Fix
↓
Verify
↓
Document
Let’s break it down.
Step 1: Observe the Symptoms
Before touching anything, I ask:
What exactly is failing?
Examples:
Pod not starting
Service unreachable
Node NotReady
Application crashing
Storage issue
DNS issue
At this stage, I avoid making assumptions.
I simply gather facts.
Commands I often use:
kubectl get pods -A
kubectl get nodes
kubectl get svc -A
The goal is visibility.
Step 2: Define the Scope
The next question is:
How big is the problem?
Is it:
One Pod?
One Deployment?
One Namespace?
One Node?
The entire cluster?
This step is important because it narrows the investigation.
For example:
If only one Pod is affected, the problem is likely application-related.
If every workload is failing, the issue may be cluster-wide.
Step 3: Gather Evidence
This is where most troubleshooting begins.
Instead of guessing, collect information.
My favorite commands:
kubectl describe pod <pod-name>
kubectl logs <pod-name>
kubectl logs --previous <pod-name>
kubectl describe node <node-name>
kubectl get events --sort-by=.metadata.creationTimestamp
Events often reveal the story behind the failure.
Step 4: Follow the Dependency Chain
One of the most powerful troubleshooting techniques is following dependencies.
For example:
Application not working?
Check:
Application
↓
Pod
↓
Deployment
↓
Service
↓
DNS
↓
Network
↓
Node
↓
Cluster
Instead of randomly jumping between components, I trace the path systematically.
This prevents missing critical clues.
Step 5: Validate Assumptions
This is where many engineers get stuck.
Let’s say you believe DNS is broken.
Don’t assume.
Prove it.
Example:
kubectl exec -it pod-name -- nslookup kubernetes.default
If DNS works, move on.
If DNS fails, investigate further.
Evidence should drive conclusions — not intuition.
Step 6: Fix One Thing at a Time
A common mistake during incidents is changing multiple things simultaneously.
Example:
Update deployment
Restart pods
Modify service
Change ConfigMap
Now you don’t know which change fixed the issue.
My rule:
Make one change.
Verify the result.
Continue if necessary.
This makes troubleshooting much easier.
Step 7: Verify the Resolution
Never assume a problem is fixed.
Verify it.
Check:
kubectl get pods
kubectl logs
kubectl get endpoints
kubectl get events
And most importantly:
Verify that the application itself is functioning correctly.
A green Pod does not always mean a healthy application.
Step 8: Document the Incident
This step is often skipped.
After resolving an issue, document:
Root cause
Symptoms
Fix applied
Prevention steps
Future-you will thank present-you.
Many recurring issues can be solved in minutes if previous incidents were documented properly.
My Mental Checklist for Common Issues
Pod Not Starting
Check:
kubectl describe pod
kubectl logs
kubectl logs --previous
Look for:
ImagePullBackOff
CrashLoopBackOff
Resource limits
Missing ConfigMaps
Missing Secrets
Service Not Working
Check:
kubectl get svc
kubectl get endpoints
kubectl describe svc
Verify:
Selectors
Ports
Target Ports
Pod readiness
DNS Problems
Check:
kubectl get pods -n kube-system
Verify CoreDNS is healthy.
Test:
nslookup kubernetes.default
Node NotReady
Check:
kubectl describe node
Investigate:
Kubelet status
Disk pressure
Memory pressure
Networking
The Most Important Skill
After years of working in IT and preparing for Kubernetes certifications, I’ve come to believe that the most valuable Kubernetes skill is not:
Writing YAML
Memorizing commands
Passing certifications
It’s troubleshooting.
Production environments are unpredictable.
Applications fail.
Nodes fail.
Networks fail.
Configurations fail.
The engineers who remain calm, gather evidence, and troubleshoot systematically are the ones who solve problems quickly.
Final Thoughts
Kubernetes troubleshooting is not about finding the perfect command.
It’s about developing a repeatable process.
Whenever something breaks, I remind myself:
Observe
↓
Scope
↓
Gather Evidence
↓
Validate Assumptions
↓
Fix
↓
Verify
↓
Document
This simple framework has helped me solve countless Kubernetes issues more effectively than any command cheat sheet ever could.
The goal isn’t to know everything.
The goal is to know how to find the answer when things go wrong.
And that’s what separates Kubernetes users from Kubernetes operators.
Connect With Me
If you’re preparing for Kubernetes certifications, pursuing the Kubestronaut journey, or working in the cloud-native ecosystem, I’d love to connect.
Follow me for more articles on Kubernetes, CNCF certifications, DevOps, Platform Engineering, and Cloud-Native technologies.
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