Docker Interview Questions For Freshers
  1. What are the advantages of using Docker?
  2. What is the difference between Docker image and Docker container?
  3. How do you install Docker on Linux?
  4. What is a Dockerfile?
  5. What is the purpose of a Docker registry?
  6. How do you create a Docker container?
  7. What is the difference between ENTRYPOINT and CMD in a Dockerfile?
  8. What is Docker Compose used for?
  9. What is the difference between a Dockerfile and a docker-compose.yml file?
  10. How do you map ports in Docker?
  11. How do you access the logs of a Docker container?
  12. How do you remove a Docker container?
  13. How do you list all the Docker containers on a host?
  14. How do you inspect a Docker image?
  15. What is the difference between Docker volumes and bind mounts?
  16. How do you copy files into a Docker container?
  17. What is the difference between the COPY and ADD commands in a Dockerfile?
  18. What is the difference between a Dockerfile and an image?
  19. How do you tag a Docker image?
  20. Write a command to start a new Docker container using the "nginx" image.
  21. Write a command to stop a running Docker container.
  22. Write a command to list all running Docker containers, showing their names and ports.
  23. Write a command to remove a Docker container and its associated volumes.
  24. Write a command to start a Docker container and map a local folder to the container's /app directory.
  25. Write a command to create a Docker image from a Dockerfile.
  26. Write a command to push a Docker image to a private Docker registry.
  27. Write a command to copy a file from your local machine into a running Docker container.
  28. Write a command to delete all unused Docker images.
  29. Write a command to display detailed information about a running Docker container.
Docker Intermediate Interview Questions
  1. How do you share data between containers in Docker Compose?
  2. What is the difference between Docker and Kubernetes?
  3. How do you create a Docker image from a running container?
  4. How do you debug a running Docker container?
  5. What is a Docker registry and how do you use it?
  6. What is Docker Swarm and how does it work?
  7. What is Docker overlay network and how does it work?
  8. How do you use Docker with Jenkins?
  9. What is Docker Hub and how does it work?
  10. What is the difference between Docker Engine and Docker Compose?
  11. How do you scale Docker containers horizontally?
  12. How do you secure Docker containers?
  13. What is the difference between a Dockerfile and a Docker image?
  14. How do you push a Docker image to Docker Hub?
  15. How do you pull a Docker image from Docker Hub?
  16. How do you update a Docker container?
  17. How do you configure environment variables in a Docker container?
  18. How do you use Docker with GitLab CI/CD?
  19. What is the difference between a Dockerfile and a docker-compose.yml file?
  20. What is Docker Machine and how does it work?
  21. Write a Dockerfile that installs the "curl" command-line tool and runs it once as part of the Docker build process.
  22. Write a Dockerfile that installs the "node.js" runtime environment and runs a "npm install" command as part of the Docker build process.
  23. Write a Dockerfile that copies a local file into the Docker image and sets an environment variable with its contents.
  24. Write a Dockerfile that exposes port 80 and runs an Nginx web server.
  25. Write a Dockerfile that installs a custom application from a remote repository and runs it as part of the Docker build process.
  26. Write a command to display the current logs of a running Docker container.
  27. Write a command to create a Docker volume with a specified name.
  28. Write a command to display the IP address of a running Docker container.
  29. Write a command to tag an existing Docker image with a new name.
  30. Write a command to pause a running Docker container.
  31. Write a command to attach to a running Docker container's console.
  32. How do you monitor Docker containers in a production environment?
  33. How do you manage Docker secrets and other sensitive data in a containerized environment?
  34. What are some common issues and limitations you've encountered while working with Docker at scale?
  35. How do you design a container orchestration strategy that is resilient, fault-tolerant, and highly available?
  36. How do you perform automated testing and continuous integration/continuous deployment (CI/CD) in a containerized environment?
  37. How do you manage resource allocation and usage in a containerized environment, especially with regard to CPU, memory, and disk space?
  38. How do you implement backup and disaster recovery strategies in a containerized environment?
Docker Interview Questions For Experienced
  1. How does Docker achieve isolation?
  2. How does Docker integrate with orchestration tools like Kubernetes?
  3. How do you configure Docker to use a specific network interface?
  4. How do you use Docker with Ansible?
  5. What is Docker plugin and how does it work?
  6. How do you use Docker with AWS ECS?
  7. How do you use Docker with AWS Fargate?
  8. What is Docker Security Scanning and how does it work?
  9. What is the difference between a Docker image and a Docker layer?
  10. What is the difference between a Docker container and a Docker service?
  11. How do you use Docker with Terraform?
  12. What is the difference between Docker volumes and tmpfs mounts?
  13. How do you use Docker with Azure Container Instances?
  14. What is Docker Secrets and how does it work?
  15. How do you use Docker with HashiCorp Vault?
  16. What is the difference between Docker registry and Docker repository?
  17. How do you use Docker with Apache Mesos?
  18. What is the difference between Docker Swarm and Docker Compose?
  19. How do you use Docker with Nomad?
  20. How do you use Docker with Google Kubernetes Engine (GKE)?
  21. Write a Docker Compose file that launches two containers: one running a MySQL database and the other running a Node.js application that connects to it.
  22. Write a Docker Compose file that launches a container running a Redis database, and another container running a Django application that connects to it.
  23. Write a Docker Compose file that launches a container running a PHP application and a container running a MySQL database, and links them together.
  24. Write a Docker Compose file that launches a container running a Tomcat server, and another container running a Java application deployed to the server.
  25. Write a Docker Compose file that launches multiple replicas of a containerized service and load balances requests across them.
  26. How do you use Docker to deploy a multi-node Elasticsearch cluster with persistent storage?
  27. How do you use Docker to deploy a multi-node Kafka cluster with ZooKeeper?
  28. How do you use Docker to deploy a microservices architecture using an API gateway?
  29. How do you use Docker to deploy a distributed machine learning model training and serving pipeline?
  30. How do you use Docker to run a desktop application in a container?
  31. How do you use Docker to deploy a multi-tier application with multiple front-end and back-end services?
  32. What are some common gotchas to look out for when working with Docker on a Linux host?
  33. What are some common gotchas to look out for when working with Docker networking?
  34. What are some common gotchas to look out for when working with Docker volumes?
  35. What are some best practices for deploying Docker containers on multiple cloud providers or on-premises infrastructure?
  36. How do you integrate Docker with other tools, such as Ansible, Terraform, Jenkins, or GitLab?
  37. How do you troubleshoot Docker networking issues, such as routing, DNS, and firewalls?
  38. How do you optimize the performance and scalability of Docker containers and images?
  39. How do you implement container security best practices, such as image signing, container hardening, and network segmentation?
  40. How do you integrate Docker with existing virtualization technologies, such as VMware or Hyper-V?
  41. How do you implement Docker in a hybrid cloud environment, where some services are running on-premises and others are running in the cloud?
  42. How do you evaluate the trade-offs between containerization and serverless computing for different workloads?
  43. How do you manage Docker in a multi-tenant environment, such as a cloud service provider or a shared hosting platform?
  44. How do you implement zero-downtime deployment strategies in a containerized environment, such as blue/green deployments or rolling updates?
  45. How do you enforce security policies and compliance requirements in a containerized environment, such as HIPAA, PCI, or GDPR?
  46. How do you use Docker to build and deploy applications that involve multiple programming languages, frameworks, and dependencies?