DevOps interviews are wide — they span CI/CD, containers, orchestration, infrastructure as code, monitoring, cloud, and a strong dose of "how would you debug this in production?" The role is about reliability and automation, so interviewers probe both your tool knowledge and your judgment under failure. Here are the DevOps engineer interview questions that actually get asked.
CI/CD
- What is CI/CD, and what's the difference between continuous delivery and deployment?
- Walk through a typical pipeline — build, test, deploy.
- Blue-green vs canary vs rolling deployments.
- How do you roll back a bad deploy safely?
Containers & orchestration
- What is Docker, and an image vs a container?
- Docker vs a virtual machine.
- Core Kubernetes concepts — pods, deployments, services, ReplicaSets.
- How does Kubernetes handle scaling and self-healing?
Infrastructure & cloud
- What is infrastructure as code (Terraform, Ansible)?
- Core cloud services (compute, storage, networking, IAM) on AWS/Azure/GCP.
- How do you manage secrets and configuration?
- What is load balancing and auto-scaling?
Monitoring & troubleshooting
- Logging, metrics, and tracing — the three pillars of observability.
- How would you debug a service that's suddenly slow in production?
- What's your approach to an incident and a post-mortem?
How to prepare
The scenario and troubleshooting questions are conversational — you reason through failures aloud while the interviewer probes. Practise narrating your debugging approach. Greenroom runs spoken technical interviews that follow up on your reasoning and give feedback. Pair it with our backend and system design guides.
Frequently asked questions
What questions are asked in a DevOps interview?
DevOps interviews cover CI/CD (pipelines, deployment strategies like blue-green and canary, safe rollbacks), containers and orchestration (Docker images vs containers, Docker vs VMs, Kubernetes pods, deployments, services, scaling and self-healing), infrastructure as code and cloud services, secrets management, and observability and troubleshooting scenarios like debugging a slow production service.
What is the difference between Docker and Kubernetes?
Docker is a containerization platform that packages an application and its dependencies into a portable image that runs as a container. Kubernetes is a container orchestration system that manages many containers across a cluster — handling scheduling, scaling, self-healing, networking and rolling updates. In short, Docker creates and runs containers; Kubernetes manages them at scale in production.
What deployment strategies should I know for a DevOps interview?
Know rolling deployments (gradually replace old instances with new), blue-green (run two identical environments and switch traffic over, enabling instant rollback), and canary (release to a small percentage of users first, then expand if metrics are healthy). Be ready to explain the trade-offs and how each handles rollback when a deploy goes wrong.
How should I prepare for a DevOps interview?
Learn the tools — CI/CD, Docker, Kubernetes, infrastructure as code, cloud and observability — but focus on judgment under failure, since scenario and troubleshooting questions carry the most weight. Practise narrating how you'd debug a broken deploy or a slow service out loud, ideally with a voice-based mock interview that follows up on your reasoning.