Question 1

What is Docker Compose?

Accepted Answer

Docker Compose is a tool for defining and running multi-container Docker applications. A docker-compose.yml file defines services, networks, and volumes. Run 'docker compose up' to start everything.

Question 2

Difference between Dockerfile and docker-compose.yml?

Accepted Answer

A Dockerfile builds a single image. docker-compose.yml orchestrates multiple containers — defining how they connect via networks, share volumes, and expose ports. They often work together: Compose references images built by Dockerfiles or pulls from registries.

Question 3

How to persist data in Docker?

Accepted Answer

Use named volumes in docker-compose.yml. Define volumes at the top level (volumes: db_data:) and mount them in services (volumes: - db_data:/var/lib/mysql). Data persists across container restarts.

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