Fundamentals
1. What is docker and why is it used?
Docker is a containerization platform that allows developers to package, ship and run application in container format. Containers are lightweight and portable making it easier to develop, test and deploy application.
2. Explain the difference between docker, images and containers.
A Docker image is a read-only template with instructions for creating a Docker container. A container is a runnable instance of an image, providing an isolated environment for the application.
3. what is dockerfile and what are its essential components?
A Dockerfile is a text file that contains instruction to build an image that containers can use.4. what is docker hub, and how is it used?
Docker Hub is a cloud-based registry service provided by Docker for finding and sharing container images. It acts as a central repository for both public and private Docker images.5. what are docker volumes, and how do they differ from bind mounts?
Docker Commands & Operations:
- How do you build a Docker image?
- How do you run a Docker container?
- How do you list running and stopped containers?
- How do you remove Docker images and containers?
- How do you inspect a Docker container?
- How do you view Docker container logs?
- How do you expose ports from a Docker container?
- How do you create a custom Docker network?
- How do you use Docker volumes to persist data?
- How do you troubleshoot a failing Docker container?
- How do you tag a Docker image?
- How do you push a Docker image to Docker Hub?
- How do you pull a docker image from a registry?
- How do you use the docker exec command?
Docker Compose & Orchestration:
- What is Docker Compose, and how does it simplify multi-container deployments?
- How do you define services, networks, and volumes in a
docker-compose.ymlfile? - How do you scale Docker Compose services?
- How do you manage environment variables in Docker Compose?
- How does Docker Compose interact with Docker networks?
- What is the difference between docker compose up, and docker compose up -d?
- How does docker compose override files work?
- How does docker work with orchestration tools like Kubernetes or Docker Swarm?
Security & Best Practices:
- What are some Docker security best practices?
- How do you secure Docker containers?
- How do you minimize the size of Docker images?
- How do you manage Docker secrets?
- How do you implement resource limits for Docker containers?
- What are the security implications of running Docker containers as root?
- How would you scan a docker image for vulnerabilities?
Troubleshooting & Advanced Topics:
- How do you troubleshoot Docker networking issues?
- How do you debug a Dockerfile build process?
- How do you monitor Docker container performance?
- What are Docker system prune commands?
- How would you implement a CI/CD pipeline with Docker?
- How does Docker relate to container runtimes?
- What are some of the common errors encountered when using docker and how would you resolve them?