Docker Images & Containers

Summary

An image is a read-only template (built from a Dockerfile); a container is a running instance of that image — understanding this distinction clarifies most of Docker's mental model.

How to Learn This

1Build an image, then run multiple containers from the same image simultaneously.
2Learn `docker ps`, `docker stop`, `docker rm` for managing running containers.
3Inspect an image's layers with `docker history`.

Dockerfile

Docker Compose

More topics in Docker & Containers

Docker Basics Dockerfile Docker Compose Volumes Networking in Docker Multi-stage Builds Container Registries Kubernetes Basics (Overview)

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