Docker 101: Pull and Push Container Images

This skill path covers the everyday workflows that revolve around the docker pull and docker push commands, plus the less obvious cases you'll inevitably run into: immutable digest references, foreign platforms, private registries with multiple credentials, offline servers, and multi-platform images. You'll learn how to:

• Pull container images from Docker Hub, GitHub Container Registry, and other registries
• Pin an image with an immutable digest instead of a mutable tag
• Pull images built for a CPU architecture different from the host's
• Inspect a remote image without pulling its filesystem layers
• Tag local images with fully-qualified references and publish them to multiple registries
• Authenticate to private registries with docker login and manage credentials side-by-side
• Mirror a container image from one repository to another with a pull + tag + push chain
• Transfer container images to a server that has no Internet access using docker save and docker load
• Assemble and publish a multi-platform image from two independent single-platform variants

By the end of this skill path, you'll be comfortable moving container images between any two registries - public or private, online or air-gapped, single- or multi-platform.

Prerequisites

• Linux command-line knowledge
• Basic container running skills (see Docker 101: Run and Manage Containers)
• Familiarity with Dockerfile authoring is helpful but not required (see Docker 101: Build Container Images)