33.1K
TE🚀 Top 30 DevOps Interview Questions (REAL & REPEATED)
These are not theory questions —
They are actually asked in DevOps interviews 👇
🔹 Core DevOps
1. What is DevOps and why do companies need it?
2. CI vs CD – what is the real difference?
3. How does DevOps improve deployment frequency?
4. What are the biggest DevOps challenges you faced?
🔹 Linux & OS
5. Difference between process and thread?
6. How do you find which service is using a port?
7. Explain system load average.
8. How do you troubleshoot high CPU usage?
🔹 Docker
9. What happens internally when you run docker run?
10. Difference between Docker image and container?
11. COPY vs ADD in Dockerfile?
12. How do you reduce Docker image size?
13. What is a multi-stage Docker build?
🔹 Kubernetes
14. Why Kubernetes if we already have Docker?
15. Pod vs Deployment vs Service?
16. What happens when a pod crashes?
17. How does Kubernetes handle scaling?
18. What is HPA (Horizontal Pod Autoscaler)?
🔹 CI/CD
19. How does a CI/CD pipeline work?
20. What happens if a deployment fails?
21. Blue-Green vs Canary deployment?
22. How do you roll back a release?
🔹 Cloud & Infra
23. Difference between EC2, ECS, and EKS?
24. How does load balancing work?
25. What is Auto Scaling and when do you use it?
26. Difference between public and private subnet?
🔹 Monitoring & Security
27. How do you monitor applications in production?
28. What is centralized logging?
29. How do you secure secrets in DevOps?
30. How do you handle production incidents?
✅ Save this post — interview prep checklist
🔁 Share with your DevOps friends
Interviews don’t test tools — they test thinking & real scenarios.
@techwithcp
