DevOps, Cloud & CI/CD Questions Interview Questions and Answers
Practice every question in this topic using expandable answers and interview tips. Answer aloud first, then open the explanation.
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Q1. What is DevOps and what are its core principles? [Easy]
Answer: DevOps is a cultural philosophy and technical practice that combines software development (Dev) and IT operations (Ops) to shorten the systems development lifecycle. Core principles include continuous integration, continuous delivery, automated testing, infrastructure as code, continuous monitoring, and collaboration.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q2. What is Docker and how does a Container differ from a Virtual Machine? [Easy]
Answer: Docker is an open-source platform that packages applications and their dependencies into lightweight containers. Containers share the host OS kernel and isolate at the process level, making them start instantly and consume fewer resources compared to Virtual Machines (VMs), which run full OS instances on a hypervisor.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q3. What is a Dockerfile, Docker Image, and Docker Container? [Easy]
Answer: A Dockerfile is a text blueprint containing step-by-step instructions to build a Docker Image. A Docker Image is a read-only immutable template with application code and environment setup. A Docker Container is a runnable running instance of a Docker Image.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q4. What is CI/CD and how do pipelines work in GitHub Actions or Jenkins? [Medium]
Answer: CI/CD stands for Continuous Integration and Continuous Delivery/Deployment. Continuous Integration automatically triggers code builds and automated unit/integration tests upon code commits. Continuous Delivery/Deployment automatically deploys verified build artifacts to staging or production environments using tools like GitHub Actions pipelines or Jenkins jobs.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q5. What is Kubernetes (K8s) and what are its core components? [Medium]
Answer: Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications. Core components include the Master Node (Control Plane with API Server, Etcd, Scheduler) and Worker Nodes running Kubelet, Kube-proxy, and Pods.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q6. What is Infrastructure as Code (IaC) and what are Terraform and Ansible? [Medium]
Answer: Infrastructure as Code (IaC) is the practice of managing and provisioning computing infrastructure through human-readable definition files rather than manual physical configuration. Terraform is a declarative IaC tool for provisioning cloud infrastructure (AWS, Azure, GCP). Ansible is an agentless configuration management tool.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q7. Explain AWS Cloud Core Services (EC2, S3, RDS, Lambda, VPC). [Hard]
Answer: AWS core services include: EC2 (Elastic Compute Cloud - scalable virtual servers), S3 (Simple Storage Service - scalable object storage), RDS (Relational Database Service - managed database), Lambda (serverless compute execution), and VPC (Virtual Private Cloud - isolated network environment).
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Q8. What is Blue-Green Deployment vs Canary Deployment? [Hard]
Answer: Blue-Green deployment runs two identical environments (Blue=Live, Green=New release); switching traffic via router/load balancer allows instant rollback. Canary deployment gradually rolls out changes to a small subset of servers/users first, monitoring metrics before deploying to 100% of the fleet.
Interview tip: Define it clearly, give a small example, and mention one practical use or limitation.
Study checklist
- Explain the answer without reading.
- Write one small example.
- Compare framework or database version differences in official documentation.
DevOps, Cloud & CI/CD Questions Interview Questions and Answers
Practice one question at a time. Read the question, answer aloud, then compare your explanation with the answer.
← Back to the complete interview hub
Q1. What is DevOps and what are its core principles?
Easy
Answer: DevOps is a cultural philosophy and technical practice that combines software development (Dev) and IT operations (Ops) to shorten the systems development lifecycle. Core principles include continuous integration, continuous delivery, automated testing, infrastructure as code, continuous monitoring, and collaboration.
Interview tip: Use a short example and connect the answer to real project work.
Q2. What is Docker and how does a Container differ from a Virtual Machine?
Easy
Answer: Docker is an open-source platform that packages applications and their dependencies into lightweight containers. Containers share the host OS kernel and isolate at the process level, making them start instantly and consume fewer resources compared to Virtual Machines (VMs), which run full OS instances on a hypervisor.
Interview tip: Use a short example and connect the answer to real project work.
Q3. What is a Dockerfile, Docker Image, and Docker Container?
Easy
Answer: A Dockerfile is a text blueprint containing step-by-step instructions to build a Docker Image. A Docker Image is a read-only immutable template with application code and environment setup. A Docker Container is a runnable running instance of a Docker Image.
Interview tip: Use a short example and connect the answer to real project work.
Q4. What is CI/CD and how do pipelines work in GitHub Actions or Jenkins?
Medium
Answer: CI/CD stands for Continuous Integration and Continuous Delivery/Deployment. Continuous Integration automatically triggers code builds and automated unit/integration tests upon code commits. Continuous Delivery/Deployment automatically deploys verified build artifacts to staging or production environments using tools like GitHub Actions pipelines or Jenkins jobs.
Interview tip: Use a short example and connect the answer to real project work.
Q5. What is Kubernetes (K8s) and what are its core components?
Medium
Answer: Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications. Core components include the Master Node (Control Plane with API Server, Etcd, Scheduler) and Worker Nodes running Kubelet, Kube-proxy, and Pods.
Interview tip: Use a short example and connect the answer to real project work.
Q6. What is Infrastructure as Code (IaC) and what are Terraform and Ansible?
Medium
Answer: Infrastructure as Code (IaC) is the practice of managing and provisioning computing infrastructure through human-readable definition files rather than manual physical configuration. Terraform is a declarative IaC tool for provisioning cloud infrastructure (AWS, Azure, GCP). Ansible is an agentless configuration management tool.
Interview tip: Use a short example and connect the answer to real project work.
Q7. Explain AWS Cloud Core Services (EC2, S3, RDS, Lambda, VPC).
Hard
Answer: AWS core services include: EC2 (Elastic Compute Cloud - scalable virtual servers), S3 (Simple Storage Service - scalable object storage), RDS (Relational Database Service - managed database), Lambda (serverless compute execution), and VPC (Virtual Private Cloud - isolated network environment).
Interview tip: Use a short example and connect the answer to real project work.
Q8. What is Blue-Green Deployment vs Canary Deployment?
Hard
Answer: Blue-Green deployment runs two identical environments (Blue=Live, Green=New release); switching traffic via router/load balancer allows instant rollback. Canary deployment gradually rolls out changes to a small subset of servers/users first, monitoring metrics before deploying to 100% of the fleet.
Interview tip: Use a short example and connect the answer to real project work.
Quick revision checklist
- Explain the answer without reading.
- Write one small example.
- Review platform or version differences in official documentation.
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