Docker Knowledge Quiz

What happens when you modify a file listed in a Dockerfile after building an image?

• Docker rebuilds the entire image from scratch

• Docker updates only the running containers

• Docker rebuilds from the modified instruction onward using cached layers

• Docker ignores the modification completely

Which file must you edit to exclude specific files/directories from the Docker build context?

• docker-compose.yml

• .gitignore

• Dockerfile

• .dockerignore

What Docker feature enables persistent data sharing between containers?

• Docker Volumes

• Docker Images

• Dockerfile

• Docker Networks

What is a Docker network type that allows containers to communicate across different Docker daemons securely?

• Overlay network

• Host network

• MACVLAN network

• Bridge network

How do you efficiently handle node modules or dependencies to minimize build time in Docker?

• Always rebuild images completely

• Use Docker caching with strategic ordering in Dockerfile

• Manually copy dependencies each time

• Store dependencies externally outside Docker

How can you access the shell of a running Docker container?

• docker inspect

• docker exec -it /bin/sh

• docker run /bin/sh

• docker build

Which scenario best fits Docker Compose usage?

• Network troubleshooting

• Defining and running multi-container Docker applications

• Managing single Docker images

• System-wide Docker configurations

Which of the following correctly describes the function of 'docker pull'?

• Deletes Docker images

• Runs a Docker container

• Fetches Docker images from Docker Hub or another registry

• Builds Docker images locally

What's the benefit of using a multi-stage Docker build?

• Automatic deployment to production

• Increased build complexity

• Faster network setup for containers

• Reduced final image size and enhanced security

What command would you use to inspect detailed information, including IP address, of a running Docker container?

• docker info

• docker inspect

• docker network inspect

• docker exec -it ip addr