Top 100 DevOps Interview Questions: Linux, Git, Docker & Kubernetes

Top 100 DevOps Interview Questions (Linux, Git, Docker & Kubernetes)

Updated for 2025 | Beginner to Advanced | Real Interview Focus

DevOps interviews test not only tools but also problem-solving, automation mindset, and real-world experience. Whether you’re preparing for FAANG, product startups, or MNC DevOps roles, these Top 100 DevOps Interview Questions will help you crack interviews confidently.

This guide covers:

•  Linux
•  Git & Version Control
•  Docker & Containers
•  Kubernetes & Orchestration

 Ideal for: Freshers, 2–10 years experience, Cloud & SRE roles

 LINUX INTERVIEW QUESTIONS (1–25)

Basic to Intermediate

1. What is Linux and why is it widely used in DevOps?
2. Difference between Linux Kernel and Linux Distribution?
3. Explain the Linux directory structure (/bin, /etc, /var, /usr).
4. What is the difference between soft link and hard link?
5. How do you check CPU, memory, and disk usage in Linux?
6. What is the use of top, htop, and vmstat?
7. Explain chmod, chown, and umask.
8. Difference between grep, awk, and sed.
9. How do you find large files in Linux?
10. What is a zombie process?

Advanced / Real-Time

11. How do you debug high CPU usage on a production Linux server?
12. What happens during Linux boot process?
13. Difference between cron and systemd timers.
14. How do you monitor disk I/O bottlenecks?
15. Explain inode and file system limits.
16. What is swap memory? When should you increase it?
17. How do you secure SSH access on Linux servers?
18. What is nice and renice?
19. How do you find which process is using a port?
20. Explain SELinux in simple terms.
21. Difference between ext4 and xfs.
22. How do you rotate logs in Linux?
23. What is strace used for?
24. Explain load average.
25. How do you automate Linux tasks in DevOps?

 GIT & VERSION CONTROL QUESTIONS (26–45)

Core Git Concepts

26. What is Git and why is it important for DevOps?
27. Difference between Git and GitHub?
28. Explain Git workflow.
29. What is a repository?
30. Difference between clone, fork, and checkout?
31. What is .gitignore?
32. Difference between commit and push?
33. What is a branch?
34. Difference between merge and rebase?
35. What is HEAD in Git?

Advanced / Real-World

36. How do you resolve merge conflicts?
37. What is Git stash and when do you use it?
38. Difference between reset, revert, and checkout.
39. What is cherry-pick?
40. How do you undo a pushed commit?
41. Explain Git hooks.
42. What branching strategy do you follow in DevOps projects?
43. How do you handle secrets in Git?
44. What is a detached HEAD state?
45. How do you secure Git repositories in CI/CD pipelines?

 DOCKER INTERVIEW QUESTIONS (46–70)

Docker Basics

46. What is Docker?
47. Difference between Docker image and container?
48. What is a Dockerfile?
49. Difference between CMD and ENTRYPOINT.
50. What is Docker Hub?
51. What is containerization?
52. Difference between VMs and Containers?
53. What is .dockerignore?
54. Explain Docker architecture.
55. What is a Docker volume?

Advanced & Production Scenarios

56. Difference between COPY and ADD.
57. What is multi-stage Docker build?
58. How do you reduce Docker image size?
59. What is Docker networking?
60. Difference between bridge and host network.
61. How do you debug a failed Docker container?
62. What is Docker Compose?
63. How do you manage secrets in Docker?
64. What is a dangling image?
65. How do you scan Docker images for vulnerabilities?
66. Explain container lifecycle.
67. How do you persist data in Docker?
68. What are Docker namespaces and cgroups?
69. How do you optimize Docker for CI/CD?
70. What are best practices for writing Dockerfiles?

 KUBERNETES INTERVIEW QUESTIONS (71–100)

Kubernetes Fundamentals

71. What is Kubernetes?
72. Why do we need Kubernetes?
73. Difference between Docker Swarm and Kubernetes?
74. What is a Pod?
75. What is a Node?
76. Explain Kubernetes architecture.
77. What is kube-api server?
78. What is etcd?
79. What is a Deployment?
80. Difference between Deployment and StatefulSet?

Advanced & Real-Time Kubernetes

81. What is a Service in Kubernetes?
82. Difference between ClusterIP, NodePort, and LoadBalancer.
83. What is Ingress?
84. What are ConfigMaps and Secrets?
85. How does Kubernetes handle self-healing?
86. What is HPA (Horizontal Pod Autoscaler)?
87. How do rolling updates work?
88. What is a namespace?
89. How do you monitor Kubernetes clusters?
90. How do you troubleshoot a pod in CrashLoopBackOff?
91. What is liveness and readiness probe?
92. How do you secure Kubernetes clusters?
93. What is RBAC?
94. What is Helm?
95. Difference between Helm and Kustomize?
96. What is a DaemonSet?
97. How do you handle node failure?
98. How do you manage secrets securely?
99. What is Kubernetes CSI?
100. Explain a real-time Kubernetes production issue you solved.

 Why This List Helps You Crack DevOps Interviews

 Covers 80%+ real interview questions
 Suitable for AWS, Azure, GCP DevOps roles
 Useful for Freshers + Experienced Professionals
 Ideal for CloudDevOpsJobs.com readers

 Final Tips for DevOps Interview Success

• Practice hands-on labs
• Explain answers with real production examples
• Focus on why, not just what
• Be strong in Linux + Kubernetes

 Bookmark this page on www.clouddevopsjobs.com and revise before every interview.