Docker Images

Definition: A Docker image is a lightweight, standalone, and executable software package that includes everything needed to run a piece of software, including the code, runtime, libraries, environment variables, and configuration files.
Usage: Images are used to create Docker containers. They can be stored and shared via Docker Hub or other container registries.
Lifecycle: Images are built from a Dockerfile using the docker build command. They are immutable once created.

Feature	Docker Images	Docker Volumes	Docker Containers
Purpose	Blueprint for containers	Persistent storage for container data	Running instances of images
Mutable	No (immutable once created)	Yes (data can be changed)	Yes (state changes during runtime)
Creation	Built from Dockerfiles	Created via Docker CLI or Docker Compose	Created from Docker images
Storage	Stored in image registries (e.g., Docker Hub)	Stored on host filesystem	Exist in memory and disk as long as running
Isolation	Provides consistent environment	Shares data across containers and host	Isolated environment for application
Usage	Basis for creating containers	Persistent data storage	Run applications in isolated environments

Docker Images are the templates used to create containers.
Docker Volumes provide persistent storage that can be shared between containers and the host.
Docker Containers are the running instances of Docker images that execute applications in isolated environments.

Jonas Notes