50 AWS DevOps Interview Questions and Answers 2026

Quick Answer: These are the 50 most-asked AWS DevOps interview questions and answers for 2026 — CI/CD on AWS, IaC, containers, monitoring, and the AWS DevOps toolchain (CodePipeline, CodeBuild, CloudFormation, EKS). Concise, interview-ready answers.

AWS DevOps Fundamentals

1. What is AWS DevOps?
   Using AWS services and DevOps practices (automation, CI/CD, IaC, monitoring) to deliver applications faster and more reliably on AWS.
2. What are the core AWS DevOps services?
   CodeCommit, CodeBuild, CodeDeploy, CodePipeline, CloudFormation, CloudWatch, and EKS/ECS.
3. What is the AWS Shared Responsibility Model?
   AWS secures the cloud infrastructure; the customer secures their data, configuration, and access.
4. What is the Well-Architected Framework?
   Six pillars guiding good design: Operational Excellence, Security, Reliability, Performance, Cost Optimization, and Sustainability.
5. What is Infrastructure as Code on AWS?
   Defining resources in code via CloudFormation, CDK, or Terraform for repeatable provisioning.

CI/CD on AWS

6. What is AWS CodePipeline?
   A managed service that orchestrates build, test, and deploy stages into a continuous delivery pipeline.
7. What is AWS CodeBuild?
   A fully managed build service that compiles code, runs tests, and produces artifacts.
8. What is AWS CodeDeploy?
   A service that automates deployments to EC2, Lambda, and ECS with rollback support.
9. What is AWS CodeCommit?
   A managed Git repository hosting service.
10. What deployment strategies does CodeDeploy support?
    In-place, blue-green, canary, and linear deployments.
11. How do you build CI/CD for containers on AWS?
    Build images in CodeBuild, push to ECR, and deploy to ECS/EKS via CodePipeline or GitOps.
12. What is a buildspec.yml?
    The file defining build phases and commands for CodeBuild.

Infrastructure as Code

13. What is AWS CloudFormation?
    AWS’s native IaC service that provisions resources from declarative templates.
14. What is a CloudFormation stack?
    A collection of AWS resources managed together as a single unit.
15. What is drift detection?
    Identifying when actual resources differ from the CloudFormation template.
16. What is the AWS CDK?
    The Cloud Development Kit — define infrastructure using programming languages that synthesize to CloudFormation.
17. CloudFormation vs Terraform?
    CloudFormation is AWS-native; Terraform is multi-cloud with its own state. See our Terraform guide.
18. What are nested stacks?
    Stacks referenced within other stacks to reuse and modularize templates.

Containers & Compute

19. What is Amazon ECS?
    AWS’s managed container orchestration service.
20. What is Amazon EKS?
    Managed Kubernetes on AWS.
21. What is AWS Fargate?
    Serverless compute that runs containers without managing EC2 nodes.
22. What is Amazon ECR?
    Elastic Container Registry — a managed Docker image registry.
23. When would you use Lambda in a DevOps pipeline?
    For event-driven automation, custom pipeline actions, and lightweight tasks.
24. How do you autoscale on AWS?
    EC2 Auto Scaling groups, ECS service autoscaling, and Kubernetes HPA/Cluster Autoscaler on EKS.

Monitoring, Security & Cost

25. What is Amazon CloudWatch?
    A monitoring service for metrics, logs, dashboards, and alarms.
26. What is AWS CloudTrail?
    Records all API activity for auditing and compliance.
27. CloudWatch vs CloudTrail?
    CloudWatch monitors performance; CloudTrail logs who did what.
28. What is AWS X-Ray?
    A distributed tracing service for analyzing and debugging applications.
29. How do you manage secrets on AWS?
    AWS Secrets Manager (with rotation) or SSM Parameter Store.
30. What is IAM and least privilege?
    Identity and Access Management; grant only the minimum permissions required.
31. How do you integrate security into AWS pipelines (DevSecOps)?
    Scan code and images, use IAM roles, enforce policies, and run tools like Inspector and CodeGuru.
32. How do you control AWS costs?
    Savings Plans/Reserved Instances, right-sizing, Spot, Cost Explorer, and budgets/alerts.

Networking, Reliability & Scenarios

33. What is a VPC?
    An isolated virtual network in AWS where you define subnets, routing, and security.
34. What is the difference between a Security Group and a NACL?
    Security Groups are stateful (instance level); NACLs are stateless (subnet level).
35. How do you achieve high availability on AWS?
    Multi-AZ deployments, Auto Scaling, load balancers, and Route 53 failover.
36. What is the difference between horizontal and vertical scaling?
    Horizontal adds more instances; vertical adds more power to an instance.
37. How do you design disaster recovery on AWS?
    Pick by RTO/RPO: backup & restore, pilot light, warm standby, or active-active.
38. How do you decouple services?
    SQS, SNS, and EventBridge for asynchronous messaging.
39. What is blue-green deployment and how do you do it on AWS?
    Run two environments and switch traffic; use CodeDeploy, ALB target groups, or Route 53.
40. How do you manage multiple AWS accounts?
    AWS Organizations with SCPs, Control Tower, and IAM Identity Center (SSO).
41. What is GitOps on AWS?
    Git-driven declarative deployments to EKS using Argo CD or Flux.
42. How do you roll back a failed deployment?
    CodeDeploy auto-rollback, previous CloudFormation stack, or redeploy the prior image tag.
43. What is immutable infrastructure?
    Replacing servers/images instead of modifying them in place.
44. What are the DORA metrics?
    Deployment frequency, lead time, change failure rate, and MTTR.
45. What is the difference between scalability and elasticity?
    Scalability handles growth; elasticity adjusts resources automatically in real time.
46. How do you store Terraform state on AWS?
    In an S3 backend with native locking (or DynamoDB), encrypted.
47. What is AWS Systems Manager?
    A service for operational management — patching, run commands, and parameter storage.
48. How do you handle logging at scale?
    CloudWatch Logs, centralized logging, and OpenSearch for analysis.
49. What is a canary deployment?
    Releasing to a small subset of users first to limit risk before full rollout.

Frequently Asked Questions

What is the difference between AWS interview and AWS DevOps interview questions?

General AWS questions focus on services; AWS DevOps questions focus on automation, CI/CD, IaC, and operating those services reliably at scale.

Which AWS certification helps for DevOps roles?

The AWS Certified DevOps Engineer – Professional, ideally after the SysOps Administrator or Developer Associate.

How should I prepare for an AWS DevOps interview?

Practice building pipelines with CodePipeline/CodeBuild, deploy to ECS/EKS, write IaC, and be ready to design highly available, secure, cost-effective systems.

Related: 50 AWS Interview Questions · Introduction to AWS DevOps · DevOps Interview Questions