🎯 DevOps & DevSecOps Interview Prep

Good engineers fix problems.
Great ones find the root cause.

Interview prep built around how production actually breaks. Scenario questions with model answers, deep notes, and real failure stories — for every major DevOps topic. One-time purchase, yours forever.

Start with Linux → See All Topics

62+Scenario Questions

20Chapters

8DevOps Topics

₹299Starts at

🔎 Free Sample — See the quality before you buy

Question from the Interview Questions PDF

🔒 Model Answer — locked in the PDF

Every Major DevOps Topic

Notes, scenario interview questions, and real failure stories for each topic. Linux is live. More launching soon.

Linux

Shell, permissions, processes, and sysadmin fundamentals.

Notes & Questions →

DCK Coming Soon

Docker

Containers, images, networking, and production patterns.

K8S Coming Soon

Kubernetes

Pods, deployments, services, and cluster operations.

AWS Coming Soon

AWS

EC2, S3, IAM, VPC, and core cloud services explained.

CCD Coming Soon

CI/CD

GitHub Actions, Jenkins, pipelines, and release automation.

MON Coming Soon

Monitoring

Prometheus, Grafana, alerting, and production observability.

SEC Coming Soon

DevSecOps

Shift left security, SAST/DAST, secrets management, and compliance.

GIT Coming Soon

Git

Branching, rebasing, GitOps, and real-world team workflows.

Scenario vs Textbook. Here is the Difference.

🗒 Textbook Questions (everywhere else)

"What is the difference between chmod 755 and chmod 644?"

"What does the kill command do?"

"What is a cron job?"

"List the Linux file permission types."

"What is /etc/fstab used for?"

🎯 Scenario Questions (Root Cause)

"A developer's script works on their laptop but gets permission denied on the server. The file is 755. Debug this."

"A process is consuming 100% CPU but your app is idle. How do you identify and handle it without causing downtime?"

"Your cron job ran fine for weeks. It did not run today. No errors in the log. Diagnose."

"A server's load average is 8 but CPU usage shows only 15%. What is happening and how do you fix it?"

"After a reboot, a mount is missing and your app cannot start. Walk through diagnosing and fixing it permanently."

Real interviewers at product companies ask scenarios. They want to see how you think, not what you memorized.

Production Fixes

Real issues, root causes, and step-by-step fixes — tagged by tool.

Container exits immediately after start

Container starts but exits within seconds. docker ps shows nothing.

permission denied: /var/run/docker.sock

Running docker commands fails with permission denied on the socket.

Docker build using stale cache after code change

Image rebuilds skip your code changes and serve old content.

Container cannot reach host or other containers

App inside container fails to connect to localhost or sibling containers.

Docker image is several GB — much larger than expected

Built image is 2-3x bigger than it needs to be.

Environment variable not available inside container

App inside container cannot read env variables you set on the host.

🔥 Coming Soon

Real Production Failure Stories

The cron job that took down payments at 2am. The chmod 777 that caused a data breach. The disk that filled up silently and killed the database. Real incidents, root causes, and what was learned. Nothing makes you stand out in an interview like a war story.

Follow @rootcausedaily on Instagram for early previews

🔥

Disk at 100%

Production DB crash at 3am

🔑

chmod 777

Security incident that cost 3 jobs

⚡

Cron + Timezone

Billing ran twice, 40,000 users charged

How Big Companies Do It

Real architecture breakdowns — Netflix, Spotify, Uber, Zomato. See the tools you are learning in action at production scale.

Browse Architectures →

Netflix Spotify Uber Airbnb Zomato Flipkart

Frequently Asked Questions

No. Google gives you textbook questions — "What is chmod?" or "Explain the Linux boot process." We give you scenario questions — "A developer's script works on their laptop but fails on the server with permission denied. The file has 755. Debug this step by step." That is the format real interviewers at product companies use. The model answers are written by engineers who have been on both sides of the table.

Yes, if you are targeting a DevOps, SRE, Platform, or Cloud role — or if your current role involves working with servers, CI/CD, or cloud. The notes assume you have used a terminal before, but do not assume DevOps experience. The interview questions are tiered from beginner to expert.

Yes. In 3 days, skip the notes and go straight to the interview questions PDF. Read all 62 questions and their model answers. Pay extra attention to anything that surprises you — those are your gaps. You will not master Linux in 3 days, but you will know exactly what to say for the most common scenarios.

Standard PDF, optimised for reading. They work on phone, tablet, laptop — anything with a PDF viewer. No DRM, no expiry. Download once and keep it forever. Most people use them on their laptop for studying and on their phone for quick review before an interview.