Table of contents
- Docker Interview Questions – Decode the Mysteries! 🤔
- 1. Difference between Image, Container, and Engine 📦🚢🔧
- 2. Docker COPY vs. ADD Commands 📄🔗
- 3. Docker CMD vs. RUN Commands 🏃♂️🛠️
- 4. Reducing Docker Image Size 📉
- 5. Why and When to Use Docker? 🌐⏰
- 6. Docker Components and Interactions 🔄🧩
- 7. Real-World Docker Scenarios 🌍
- 8. Docker vs. Hypervisor ☁️🔧
- 9. Advantages and Disadvantages of Docker 🌟💡
- 10. Docker Namespace 🏠
- 11. Docker Registry 🏛️
- 12. Entry Point 🚪
- 13. Implementing CI/CD in Docker 🔄🚀
- 14. Data Persistence on Container Exit 📦💾
- 15. Docker Swarm 🐝
- Docker Commands Quick Reference 🏁
- Docker Image Size Reduction Practices 📏
Hello DevOps enthusiasts! Today's mission is all about Docker – a must-know topic, especially for those diving into DevOps interviews, whether you're a fresher or seasoned pro. Let's unravel some crucial Docker interview questions and level up our Docker game! 🚀
Docker Interview Questions – Decode the Mysteries! 🤔
1. Difference between Image, Container, and Engine 📦🚢🔧
Image: Blueprint for containers.
Container: Running instance of an image.
Engine: Core of Docker, responsible for building and running containers.
2. Docker COPY vs. ADD Commands 📄🔗
COPY: Copies local files into the container.
ADD: Supports remote URLs and automatically extracts compressed files.
3. Docker CMD vs. RUN Commands 🏃♂️🛠️
CMD: Specifies default command for container.
RUN: Executes commands during image build.
4. Reducing Docker Image Size 📉
Use multi-stage builds, minimize layers, and remove unnecessary dependencies to trim down image size.
5. Why and When to Use Docker? 🌐⏰
Docker ensures consistency across environments, accelerates development, and simplifies deployment.
6. Docker Components and Interactions 🔄🧩
Understand the roles of Docker Compose, Docker File, Docker Image, and Docker Container in orchestrating your application.
7. Real-World Docker Scenarios 🌍
Share experiences – whether it's streamlining development, deploying microservices, or enhancing scalability.
8. Docker vs. Hypervisor ☁️🔧
Docker operates at the container level, while hypervisors virtualize the entire operating system. Docker is lightweight and efficient.
9. Advantages and Disadvantages of Docker 🌟💡
Advantages: Portability, Efficiency, Isolation.
Disadvantages: Limited GUI, Security Concerns.
10. Docker Namespace 🏠
Isolates processes within a container, preventing conflicts.
11. Docker Registry 🏛️
Centralized repository to store and share Docker images.
12. Entry Point 🚪
Specifies the default executable when a container starts.
13. Implementing CI/CD in Docker 🔄🚀
Utilize CI/CD pipelines for automated testing and deployment of Dockerized applications.
14. Data Persistence on Container Exit 📦💾
Data is lost unless a persistent volume is mounted.
15. Docker Swarm 🐝
Docker's native clustering and orchestration solution for managing a group of Docker hosts.
Docker Commands Quick Reference 🏁
docker ps: View running containers.docker run --name [container_name]: Run a container with a specific name.docker export [container_id] > [output_file]: Export a Docker container.docker import [file or URL] [repository:tag]: Import an existing Docker image.docker rm [container_id]: Delete a container.docker system prune -a: Remove all stopped containers, unused networks, build caches, and dangling images.
Docker Image Size Reduction Practices 📏
Optimize by using smaller base images, combining commands, and cleaning up unnecessary files and dependencies.
There you have it – a deep dive into essential Docker interview questions! Ready to ace your next DevOps interview? Let's keep learning and evolving together! 🚀👩💻 #Docker #DevOpsInterview #TechSkills #LearnWithMe #ContainerizationMagic #90daysofdevops #90daysofdevopschallenge
You can connect with me at: https://www.linkedin.com/in/davendersingh/