Introduction to Docker Images
A Docker image is a template for a container.
Everything starts from a Docker image.
When you tell Docker to create a container from an image using docker run
, it will perform its magic (create the file system, initialize the dependencies, and more) and then the container will be created.
Images are built from a Dockerfile using the docker build
command, and they can be stored locally, or published in a Docker registry like Docker Hub, where you can store public and private images.
If you visit https://hub.docker.com/ you will see a lot of images you can freely use without having to create your own images.
Often times those images are official and made by the development teams behind a specific technology.
For example this is the official Node.js Docker Image: https://registry.hub.docker.com/_/node.
We’ll talk more about how to use images and containers soon.
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