Top 100 Essential DevOps & Operations Interview Questions to Master Your Career

This article compiles 100 common interview questions frequently asked by major tech companies, focusing on fundamental Operations and DevOps concepts.

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 to manage configuration and secrets.

How is security ensured in DevOps practices?

How to set kernel parameters?

Explain what RAID is and the different 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 difference between iptables and firewalld.

How to find the most CPU‑consuming 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 scheduled tasks (cron jobs)?

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 Shell script security?