Docker Interview Questions and Answers

Ques 26. Explain the concept of Docker Image Layers.

Docker Image Layers are the intermediate layers produced during the image build process. They are cached and reused, improving build efficiency.

Ques 27. What is the purpose of Docker Machine?

Docker Machine is a tool that makes it easy to create and manage Docker hosts on local machines or cloud providers. It simplifies the process of setting up Docker environments.

Ques 28. How can you share data between containers in Docker?

Data can be shared between containers using Docker Volumes or by using shared directories when running containers on the same host.

Example:

docker run -v /path/on/host:/path/in/container my_image

Ques 29. Explain the concept of Docker Orchestration.

Docker Orchestration involves the automated coordination and management of multiple containers to ensure they work together seamlessly. It includes tools like Docker Swarm and Kubernetes.

Ques 30. How do you update a Docker service in a Swarm cluster?

You can use the `docker service update` command to update a Docker service in a Swarm cluster. It allows you to change the image, replicas, and other configurations.

Example:

docker service update --image new_image:latest my_service