Docker Real-Time Interview Questions with Answers [2025]

This guide provides 103 real-time Docker interview questions with practical answers for MNC roles. Covering containerization, orchestration, networking, security, and AWS integration (ECS, EKS, CodePipeline), it equips candidates to excel in technical interviews with scalable, secure Docker solutions.

Docker Fundamentals

1. What is Docker, and how does it differ from virtual machines?

Docker uses containerization to run applications in isolated environments, sharing the host OS kernel. Unlike VMs, which require a full OS per instance, Docker containers are lightweight, faster, and resource-efficient, ideal for scalable MNC deployments.

2. Why use Docker for DevOps pipelines?

Docker ensures consistent environments across development, testing, and production. It simplifies dependency management, enables CI/CD with tools like CodePipeline, and supports microservices. Containers reduce setup time, ensuring reliable, portable deployments in MNC environments.

3. How does Docker ensure container isolation?

Docker leverages Linux namespaces for process isolation, cgroups for resource limits, and a layered filesystem (e.g., overlay2). This isolates containers, ensuring secure, independent execution. Monitor with docker inspect, integrate with CloudWatch for MNC scalability.

4. When should you use Docker Compose for development?

Use Docker Compose to define multi-container applications in docker-compose.yml. It simplifies local testing of microservices, manages dependencies, and simulates production. Integrate with CodePipeline for CI/CD, monitor with CloudWatch in MNC environments.

5. Which components make up Docker architecture?

• Docker Daemon: Manages containers, images.
• Docker Client: Sends CLI commands to daemon.
• Docker Hub: Stores images for sharing.
• Images: Read-only application templates.
• Containers: Running instances of images.
  Ensures consistent, scalable deployments in MNC CI/CD pipelines.

6. Who manages Docker images in a team environment?

DevOps engineers build, tag, and push images to registries like ECR using docker build, docker tag, docker push. Automate with CodePipeline, scan with AWS Inspector, monitor with CloudWatch for secure MNC deployments.

7. What causes a Docker container to exit unexpectedly?

Check docker logs for errors, verify resource limits (CPU/memory), and inspect application code. Ensure proper CMD/ENTRYPOINT in Dockerfile, redeploy via CodePipeline, monitor with CloudWatch to stabilize containers in MNC environments.

Docker Image and Build Scenarios

8. How do you optimize a Docker image for production?

• Use minimal base images (e.g., alpine).
• Remove unnecessary dependencies.
• Leverage multi-stage builds.
• Compress layers with .dockerignore.
• Scan with AWS Inspector.
  Ensures lightweight, secure images for MNC CI/CD pipelines.

9. Why does a Docker build fail due to missing dependencies?

Missing dependencies halt builds. Verify Dockerfile RUN commands, check package manager sources, and update requirements.txt or package.json. Test locally, automate with CodeBuild, monitor with CloudWatch to ensure reliable MNC builds.

10. What creates a multi-stage Docker build?

FROM node:18 AS builder
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
RUN npm run build

FROM node:18-alpine
WORKDIR /app
COPY --from=builder /app/dist .
CMD ["node", "index.js"]

Multi-stage builds reduce image size, ensuring efficient CI/CD in MNC environments.

11. When does a Docker image become too large?

Large images slow CI/CD. Use minimal base images, clean up temporary files, and leverage multi-stage builds. Store in ECR, scan with AWS Inspector, monitor with CloudWatch to optimize MNC deployments.

12. How do you secure a Docker image in ECR?

• Scan with AWS Inspector for vulnerabilities.
• Use private ECR repositories.
• Restrict access with IAM policies.
• Encrypt images with KMS.
• Monitor with CloudWatch.
  Ensures secure CI/CD image management in MNC environments.

13. Where do you store Docker images for team access?

Store images in AWS ECR, push via docker push, and automate with CodePipeline. Restrict access with IAM, monitor with CloudWatch, audit with CloudTrail. Ensures collaborative, secure image management in MNC environments.

14. Which strategies handle Docker build cache issues?

• Use --no-cache for fresh builds.
• Order Dockerfile commands for layer reuse.
• Cache dependencies in S3.
• Monitor build performance with CloudWatch.
  Ensures efficient, reliable CI/CD builds in MNC environments.

Docker Networking Scenarios

15. How do you troubleshoot Docker container network issues?

Check docker network inspect for configuration, verify bridge/host modes, and test connectivity with ping. Adjust firewall rules, monitor with CloudWatch, redeploy via CodePipeline to restore networking in MNC environments.

16. Why does a container fail to communicate with another?

Verify network mode (bridge, host, overlay), check docker network ls, and ensure ports are exposed in Dockerfile. Test with docker exec, monitor with CloudWatch to resolve CI/CD networking issues in MNC environments.

17. What configures a Docker overlay network for multi-host?

docker network create -d overlay my-overlay-network

Use Swarm or EKS, configure VPC subnets, and monitor with CloudWatch. Ensures scalable, multi-host container communication in MNC CI/CD pipelines.

18. When do you use a bridge network versus host network?

Bridge networks isolate containers, ideal for microservices. Host networks share the host’s stack, suited for high-performance apps. Configure in docker run, monitor with CloudWatch for MNC CI/CD compatibility.

19. How do you expose a container port to the host?

EXPOSE 8080

Map ports with docker run -p 8080:8080, configure ALB for traffic, monitor with CloudWatch. Ensures accessible, secure container services in MNC CI/CD environments.

20. Which tools monitor Docker container network performance?

• Use CloudWatch for container metrics.
• Enable VPC Flow Logs for traffic analysis.
• Integrate X-Ray for tracing.
• Configure alerts with SNS.
  Ensures observable CI/CD networking in MNC environments.

21. Why does a Docker container lose external connectivity?

Check VPC security groups, verify DNS resolution, and inspect docker network settings. Adjust firewall rules, redeploy via CodePipeline, monitor with CloudWatch to restore connectivity in MNC environments.

Docker Orchestration Scenarios

22. How do you deploy Docker containers to ECS?

Define task definitions, push images to ECR, and deploy via CodePipeline. Use ALB for load balancing, monitor with CloudWatch. Ensures scalable, orchestrated CI/CD in MNC environments.

23. Why does an ECS task fail to start?

Check CloudWatch Logs for errors, verify task definition CPU/memory, ensure IAM roles allow ECR access. Adjust resources, redeploy via CodePipeline, monitor with CloudWatch to stabilize MNC CI/CD.

24. What scales Docker containers in EKS?

Enable HPA with kubectl autoscale, set CPU/memory limits, and use Cluster Autoscaler. Push images to ECR, deploy via CodePipeline, monitor with CloudWatch. Ensures scalable CI/CD in MNC Kubernetes environments.

25. When does a Docker Swarm service fail to deploy?

Verify service configuration with docker service inspect, check node availability, and ensure image accessibility in ECR. Redeploy with docker service update, monitor with CloudWatch in MNC environments.

26. How do you implement rolling updates in Docker Swarm?

docker service update --update-delay 10s --update-parallelism 2 my-service

Test updates in staging, monitor with CloudWatch, roll back if needed. Ensures seamless CI/CD in MNC Swarm environments.

27. Which strategies optimize Docker orchestration in EKS?

• Use node affinity for pod placement.
• Enable HPA for dynamic scaling.
• Configure Cluster Autoscaler.
• Monitor with CloudWatch.
  Ensures high-performance CI/CD in MNC Kubernetes environments.

28. Who manages multi-tenant Docker deployments in EKS?

DevOps architect uses namespaces for isolation, implements RBAC, pushes images to ECR. Automate with CodePipeline, monitor with CloudWatch, audit with CloudTrail. Ensures secure CI/CD in MNC environments.

Docker Security Scenarios

29. How do you secure a Docker container in production?

• Run as non-root user.
• Scan images with AWS Inspector.
• Use minimal base images.
• Restrict container privileges.
• Monitor with CloudWatch.
  Ensures secure CI/CD deployments in MNC environments.

30. Why does a Docker container have vulnerabilities?

Unpatched images cause risks. Scan with AWS Inspector, update base images (e.g., alpine), and automate scans in CodePipeline. Monitor with CloudWatch to ensure secure CI/CD in MNC environments.

31. What implements Docker secrets management?

docker secret create my-secret secret.txt

Use Docker secrets in Swarm or Kubernetes secrets in EKS, integrate with Secrets Manager, monitor with CloudWatch. Ensures secure CI/CD in MNC environments.

32. When do you use Docker Content Trust (DCT)?

Enable DCT to verify image signatures with export DOCKER_CONTENT_TRUST=1. Push signed images to ECR, automate with CodePipeline, monitor with CloudWatch. Ensures trusted CI/CD in MNC environments.

33. How do you restrict Docker container resource usage?

docker run --memory="512m" --cpus="0.5" my-image

Set cgroups limits, monitor with CloudWatch, deploy via CodePipeline. Prevents resource abuse, ensures stable CI/CD in MNC environments.

34. Which tools audit Docker container security?

• Use AWS Inspector for image scans.
• Enable CloudTrail for API auditing.
• Monitor container metrics with CloudWatch.
• Integrate scans in CodePipeline.
  Ensures secure CI/CD in MNC environments.

35. Why is a Docker container exposed to unauthorized access?

Check security groups, verify exposed ports, and audit IAM roles. Update Dockerfile to limit ports, redeploy via CodePipeline, monitor with CloudWatch. Secures CI/CD in MNC environments.

Docker CI/CD Integration Scenarios

36. How do you integrate Docker with CodePipeline?

Build Docker images in CodeBuild, push to ECR, deploy to ECS/EKS via CodePipeline. Monitor with CloudWatch, audit with CloudTrail. Ensures automated, scalable CI/CD in MNC environments.

37. Why does a Docker-based pipeline fail in CodeBuild?

Check buildspec.yml for errors, verify Dockerfile syntax, ensure ECR access. Update dependencies, test locally, monitor with CloudWatch. Restores reliable CI/CD builds in MNC environments.

38. What automates Docker image scanning in CI/CD?

version: 0.2
phases:
  build:
    commands:
      - docker build -t my-image .
      - aws ecr start-image-scan --repository-name my-repo --image-id imageTag=latest

Integrate AWS Inspector in CodePipeline, monitor with CloudWatch. Ensures secure CI/CD in MNC environments.

39. When does a Docker pipeline deploy to the wrong ECS cluster?

Verify CodePipeline stage configurations, check ECS task definitions, and ensure environment variables. Update IAM roles, redeploy, monitor with CloudWatch. Ensures accurate CI/CD in MNC environments.

40. How do you implement blue-green deployments with Docker?

Use CodeDeploy with Docker on ECS, create green environment, switch ALB traffic, monitor with CloudWatch. Roll back if needed, ensures zero-downtime CI/CD in MNC environments.

41. Which tools monitor Docker pipeline performance?

• Use CloudWatch for container metrics.
• Enable X-Ray for tracing.
• Set SNS alerts for failures.
• Integrate with CodePipeline.
  Ensures observable CI/CD in MNC environments.

42. Why does a Docker container fail to pull from ECR?

Verify IAM roles for ECR access, check docker login, and inspect docker pull errors. Update credentials, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

Docker Storage and Persistence Scenarios

43. How do you manage persistent storage for Docker containers?

docker run -v /data:/app/data my-image

Use Docker volumes or EFS for persistence, integrate with ECS, monitor with CloudWatch. Ensures reliable data storage in MNC CI/CD environments.

44. Why does a container lose data on restart?

Containers are ephemeral. Use volumes or bind mounts for persistence, configure EFS for ECS, and monitor with CloudWatch. Redeploy via CodePipeline to ensure data integrity in MNC environments.

45. What configures Docker volumes for multi-container apps?

version: '3'
services:
  app:
    image: my-app
    volumes:
      - my-volume:/app/data
volumes:
  my-volume:

Use Docker Compose, integrate with ECS, monitor with CloudWatch. Ensures persistent CI/CD in MNC environments.

46. When do you use EFS with Docker containers?

Use EFS for shared storage in ECS multi-container apps. Mount via task definitions, monitor with CloudWatch, deploy via CodePipeline. Ensures scalable, persistent CI/CD in MNC environments.

47. How do you optimize Docker volume performance?

• Use EFS for shared storage.
• Configure burst credits for throughput.
• Monitor IOPS with CloudWatch.
• Optimize mount points in task definitions.
  Ensures high-performance CI/CD in MNC environments.

48. Which strategies back up Docker container data?

• Use AWS Backup for EFS volumes.
• Schedule backups via CloudWatch Events.
• Store in S3 for redundancy.
• Monitor with CloudWatch.
  Ensures resilient CI/CD in MNC environments.

49. Why does a Docker volume cause performance issues?

Check EFS throughput, optimize IOPS, and verify mount configurations. Adjust task definitions, redeploy via CodePipeline, monitor with CloudWatch. Ensures efficient CI/CD storage in MNC environments.

Docker Troubleshooting Scenarios

50. How do you diagnose a Docker container crash?

Check docker logs, inspect resource usage with docker stats, and verify Dockerfile CMD/ENTRYPOINT. Redeploy via CodePipeline, monitor with CloudWatch to stabilize containers in MNC environments.

51. Why does a Docker container consume excessive CPU?

Analyze docker stats for usage, set cgroups limits with --cpus, and optimize application code. Redeploy via CodePipeline, monitor with CloudWatch to ensure efficient CI/CD in MNC environments.

52. What causes a Docker build to hang?

Check Dockerfile for large dependencies, verify network connectivity, and inspect docker build logs. Use --no-cache if needed, automate with CodeBuild, monitor with CloudWatch. Restores CI/CD builds in MNC environments.

53. When does a container fail to start in ECS?

Verify task definition CPU/memory, check CloudWatch Logs for errors, ensure ECR access. Adjust resources, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

54. How do you troubleshoot Docker network latency?

Check docker network inspect, verify VPC Flow Logs, and test with ping. Adjust security groups, redeploy via CodePipeline, monitor with CloudWatch. Ensures low-latency CI/CD in MNC environments.

55. Which logs diagnose a Docker container failure?

• Use docker logs for application errors.
• Check CloudWatch Logs for ECS/EKS.
• Enable X-Ray for tracing.
• Set CloudWatch alarms for alerts.
  Ensures effective CI/CD troubleshooting in MNC environments.

56. Why does a Docker service fail health checks in ECS?

Check ALB health check settings, verify task definition ports, analyze CloudWatch Logs. Update configurations, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

Docker Advanced Scenarios

57. How do you implement a circuit breaker in Dockerized microservices?

from resilience4j import CircuitBreaker
import requests
circuit_breaker = CircuitBreaker(failure_threshold=5)
@circuit_breaker
def call_service():
    try:
        return requests.get('http://service:8080')
    except:
        return {"status": "fallback"}

Deploy in ECS, monitor with CloudWatch. Ensures fault-tolerant CI/CD in MNC environments.

58. Why use Docker Swarm over Kubernetes for small teams?

Swarm is simpler, requiring less configuration than EKS. Use for lightweight orchestration, deploy with docker service create, monitor with CloudWatch. Ensures efficient CI/CD for small MNC teams.

59. What optimizes Docker container startup time?

• Use lightweight base images (e.g., alpine).
• Minimize layers in Dockerfile.
• Optimize CMD/ENTRYPOINT commands.
• Monitor startup with CloudWatch.
  Ensures fast CI/CD deployments in MNC environments.

60. When do you use Docker for serverless applications?

Use Docker to package Lambda functions with custom runtimes. Build images, push to ECR, deploy via CodePipeline, monitor with CloudWatch. Ensures flexible serverless CI/CD in MNC environments.

61. How do you manage Docker image versioning?

Tag images with docker tag (e.g., my-app:1.0), push to ECR, automate with CodePipeline. Use semantic versioning, monitor with CloudWatch. Ensures organized CI/CD in MNC environments.

62. Which strategies handle Docker container logging?

• Configure awslogs driver for CloudWatch.
• Use Fluentd for centralized logging.
• Set retention policies in CloudWatch.
• Integrate with CodePipeline.
  Ensures observable CI/CD in MNC environments.

63. Why does a Docker container run out of memory?

Check docker stats for usage, set --memory limits, optimize application code. Redeploy via CodePipeline, monitor with CloudWatch to prevent crashes in MNC CI/CD environments.

Docker AWS Integration Scenarios

64. How do you deploy Docker containers to AWS Fargate?

Define ECS task definitions, push images to ECR, deploy via CodePipeline. Use Fargate for serverless, monitor with CloudWatch, scale with Auto Scaling. Ensures scalable CI/CD in MNC environments.

65. Why does an EKS pod fail to pull Docker images?

Verify IAM roles for ECR access, check Kubernetes secrets, analyze kubectl describe pod. Update credentials, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

66. What integrates Docker with AWS CodeBuild?

version: 0.2
phases:
  build:
    commands:
      - docker build -t my-image .
      - aws ecr get-login-password | docker login --username AWS --password-stdin my-ecr-repo
      - docker push my-ecr-repo:latest

Automates Docker builds in CI/CD, monitors with CloudWatch for MNC environments.

67. When do you use ECS versus EKS for Docker?

ECS simplifies container management for AWS-native apps; EKS suits complex Kubernetes workloads. Choose based on requirements, deploy via CodePipeline, monitor with CloudWatch. Ensures optimal CI/CD in MNC environments.

68. How do you secure Docker containers in ECS?

• Use IAM roles for task access.
• Scan images with AWS Inspector.
• Configure security groups.
• Monitor with CloudWatch.
  Ensures secure CI/CD deployments in MNC environments.

69. Which tools monitor Docker containers in EKS?

• Use CloudWatch Container Insights for metrics.
• Enable X-Ray for tracing.
• Set Kubernetes events in CloudWatch.
• Integrate with CodePipeline.
  Ensures observable CI/CD in MNC environments.

70. Why does a Docker container fail in AWS Batch?

Check CloudWatch Logs for job errors, verify compute environment resources, ensure IAM roles. Adjust job definitions, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

Docker Performance Scenarios

71. How do you optimize Docker container CPU usage?

Set --cpus limits, optimize application code, monitor with docker stats and CloudWatch. Redeploy via CodePipeline to ensure efficient resource usage in MNC CI/CD environments.

72. Why does a Docker container experience high disk I/O?

Check volume configurations, optimize EFS settings, and monitor IOPS with CloudWatch. Adjust mounts, redeploy via CodePipeline to improve CI/CD performance in MNC environments.

73. What improves Docker image pull performance?

Use ECR with CloudFront for caching, optimize VPC endpoints, and monitor with CloudWatch. Automate pulls in CodePipeline to ensure fast CI/CD in MNC environments.

74. When does a Docker container cause network bottlenecks?

Check docker network inspect, verify VPC Flow Logs, and optimize security groups. Redeploy via CodePipeline, monitor with CloudWatch to resolve CI/CD bottlenecks in MNC environments.

75. How do you scale Docker containers for traffic spikes?

• Enable ECS Auto Scaling with CloudWatch metrics.
• Use ALB for load balancing.
• Optimize task definitions.
• Monitor with CloudWatch.
  Ensures scalable CI/CD in MNC environments.

76. Which metrics monitor Docker container performance?

• Track CPU/memory with CloudWatch.
• Use docker stats for real-time data.
• Enable X-Ray for application tracing.
• Set SNS alerts for thresholds.
  Ensures performant CI/CD in MNC environments.

77. Why does a Dockerized app have slow response times?

Analyze CloudWatch metrics for latency, optimize application code, and adjust container resources. Redeploy via CodePipeline, monitor with CloudWatch to restore CI/CD performance in MNC environments.

Docker Security and Compliance Scenarios

78. How do you ensure Docker compliance with GDPR?

• Encrypt data with KMS in containers.
• Restrict access with IAM roles.
• Audit with CloudTrail.
• Automate scans in CodePipeline.
  Ensures compliant CI/CD in MNC environments.

79. Why is a Docker container vulnerable to privilege escalation?

Check for root user, verify capabilities with docker inspect. Run as non-root, scan with AWS Inspector, redeploy via CodePipeline. Ensures secure CI/CD in MNC environments.

80. What implements Docker container auditing?

Enable CloudTrail for Docker API calls, monitor container events with CloudWatch, and integrate with CodePipeline. Use AWS Config for compliance checks. Ensures auditable CI/CD in MNC environments.

81. When do you rotate Docker secrets?

Use Secrets Manager for automated rotation, integrate with ECS/EKS task definitions, monitor with CloudWatch. Redeploy via CodePipeline to ensure secure CI/CD in MNC environments.

82. How do you prevent Docker container breakouts?

• Use AppArmor or SELinux profiles.
• Restrict syscalls with seccomp.
• Run as non-root user.
• Monitor with CloudWatch.
  Ensures secure CI/CD in MNC environments.

83. Which tools secure Docker images in CI/CD?

• Scan with AWS Inspector in CodePipeline.
• Use DCT for image signing.
• Restrict ECR access with IAM.
• Monitor with CloudWatch.
  Ensures secure CI/CD in MNC environments.

Docker Multi-Container Scenarios

84. How do you manage multi-container apps with Docker Compose?

version: '3'
services:
  web:
    image: my-app
    ports:
      - "8080:8080"
  db:
    image: postgres
    environment:
      - POSTGRES_PASSWORD=mysecret

Deploy to ECS, monitor with CloudWatch. Ensures scalable CI/CD in MNC environments.

85. Why does a multi-container app fail to communicate?

Verify Docker network settings, check docker-compose.yml service links, and test with docker exec. Adjust configurations, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

86. What orchestrates multi-container apps in production?

Use ECS or EKS for orchestration, define task/pod definitions, and deploy via CodePipeline. Monitor with CloudWatch, scale with Auto Scaling. Ensures robust CI/CD in MNC environments.

87. When do you use Docker Swarm for multi-container apps?

Use Swarm for lightweight orchestration, configure with docker service create, and monitor with CloudWatch. Deploy via CodePipeline for simple, scalable CI/CD in MNC environments.

88. How do you secure multi-container communication?

• Use overlay networks for isolation.
• Configure service-level security groups.
• Encrypt traffic with TLS.
• Monitor with CloudWatch.
  Ensures secure CI/CD in MNC environments.

Docker Advanced Integration Scenarios

89. How do you integrate Docker with AWS App Mesh?

Configure App Mesh with ECS/EKS, define proxies in task definitions, and deploy via CodePipeline. Monitor with CloudWatch, trace with X-Ray. Ensures observable CI/CD in MNC environments.

90. Why does a Docker container fail in AWS Batch?

Check job definition resources, verify IAM roles, analyze CloudWatch Logs. Adjust configurations, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

91. What implements Docker with AWS Step Functions?

{
  "StartAt": "Build",
  "States": {
    "Build": {
      "Type": "Task",
      "Resource": "arn:aws:states:::codebuild:startBuild.sync",
      "Next": "Deploy"
    },
    "Deploy": {
      "Type": "Task",
      "Resource": "arn:aws:states:::ecs:runTask.sync",
      "End": true
    }
  }
}

Orchestrates Docker CI/CD, ensures automation in MNC environments.

92. When do you use Docker with AWS Lambda?

Package Lambda functions in Docker images, push to ECR, deploy via CodePipeline. Monitor with CloudWatch, optimize cold starts. Ensures flexible serverless CI/CD in MNC environments.

93. How do you implement GitOps with Docker in EKS?

Use ArgoCD to sync Docker manifests from CodeCommit, deploy to EKS via CodePipeline. Monitor with CloudWatch, audit with CloudTrail. Ensures declarative CI/CD in MNC environments.

Docker Code-Based Scenarios

94. How do you create a Dockerfile for a Node.js app?

FROM node:18-alpine
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
EXPOSE 8080
CMD ["node", "index.js"]

Ensures lightweight, reliable CI/CD builds in MNC environments.

95. What configures a Docker Compose file for ECS?

version: '3'
services:
  app:
    image: my-ecr-repo:latest
    ports:
      - "8080:8080"
    environment:
      - AWS_REGION=us-east-1
  db:
    image: postgres:latest
    environment:
      - POSTGRES_PASSWORD=mysecret

Deploys to ECS, ensures scalable CI/CD in MNC environments.

96. Why use a .dockerignore file?

node_modules
.git
*.log

Reduces image size, excludes unnecessary files, improves CI/CD build efficiency in MNC environments.

97. How do you define a Kubernetes pod with a Docker image?

apiVersion: v1
kind: Pod
metadata:
  name: my-app
spec:
  containers:
  - name: app
    image: my-ecr-repo:latest
    ports:
    - containerPort: 8080

Deploys to EKS, ensures scalable CI/CD in MNC environments.

98. What runs a Docker container in ECS?

family: my-app
containerDefinitions:
  - name: app
    image: my-ecr-repo:latest
    cpu: 256
    memory: 512
    portMappings:
      - containerPort: 8080

Ensures reliable CI/CD deployments in MNC environments.

99. Which code secures a Docker container in ECS?

family: secure-app
containerDefinitions:
  - name: app
    image: my-ecr-repo:latest
    cpu: 256
    memory: 512
    secrets:
      - name: DB_PASSWORD
        valueFrom: arn:aws:secretsmanager:us-east-1:123456789012:secret:my-secret

Uses Secrets Manager for secure CI/CD in MNC environments.

Docker Multi-Region and Compliance Scenarios

100. How do you deploy Docker containers across multiple regions?

Use ECS with CloudFormation StackSets, push images to ECR, route traffic with Route 53. Monitor with CloudWatch, deploy via CodePipeline. Ensures resilient CI/CD in MNC environments.

101. Why does a multi-region Docker deployment fail?

Check CloudWatch Logs for region-specific errors, verify ECR replication, and test Route 53 routing. Redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD in MNC environments.

102. What ensures PCI DSS compliance for Docker?

• Encrypt data with KMS.
• Restrict access with IAM roles.
• Audit with CloudTrail.
• Scan images with AWS Inspector.
  Ensures compliant CI/CD in MNC environments.

103. How do you handle a Docker container data breach?

Isolate containers with security groups, analyze CloudTrail logs, scan with AWS Inspector. Patch vulnerabilities, redeploy via CodePipeline, monitor with CloudWatch. Restores CI/CD security in MNC environments.