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How to Delete a Docker Image: Commands, Options, and What to Know First
Docker images can pile up fast. Every docker pull, every build, every failed experiment leaves a layer on your disk. Knowing how to delete Docker images — and when it's safe to do so — is one of those foundational skills that keeps your environment clean and your storage from quietly filling up.
What a Docker Image Actually Is
Before deleting anything, it helps to understand what you're removing. A Docker image is a read-only template used to create containers. It's built from layers — each layer representing a set of filesystem changes — and stored locally on your machine after you pull or build it.
Images are distinct from containers. A container is a running (or stopped) instance created from an image. This distinction matters because Docker won't let you remove an image that has a dependent container attached to it, even if that container is stopped.
The Basic Command: docker rmi
The primary command for deleting a Docker image is: