100 Essential Operations Interview Questions to Ace Your DevOps Interview

This article gathers 100 frequently asked operations interview questions, focusing on core DevOps concepts, Linux administration, and related tooling.

Explain the core principles of DevOps.

What are Continuous Integration (CI) and Continuous Deployment (CD)?

Explain the concept of Infrastructure as Code (IaC).

How do you monitor system and application performance?

Describe how you implement automated deployment.

Explain blue‑green deployment and canary deployment.

What is containerization? How does Docker work?

Explain how Kubernetes works and its main components.

Describe how you manage configuration and secrets.

How is security ensured in DevOps practice?

How to set kernel parameters?

Explain what RAID is and the differences between RAID levels.

How to find and terminate zombie processes?

Explain what SELinux is and its purpose.

How to configure an IP address in Linux?

Explain what LVM is in Linux and its benefits.

Explain what NFS is and how to configure it.

How to use SSH for password‑less login?

Describe the differences between iptables and firewalld.

How to identify the most CPU‑intensive process?

Explain what Docker containers are and how they differ from virtual machines.

How to backup and restore a Linux system?

How to set up a cron job?

Explain what virtual memory is and how to configure it.

How to manipulate strings in shell scripts?

Explain how to handle files and directories in shell scripts.

How to use regular expressions in shell scripts?

Explain I/O redirection and pipelines in shell scripts.

How to ensure the security of shell scripts?