Container Registries
ExplainedConcept
Also known as: Image Registry
Storage for container images: a library of ready-to-run software packages.
Container Registries, explained
Written by EduVerseWhat it is
A container registry is a server that stores container images and hands them out on request. You push an image to it after building, and servers or clusters pull it from there to run it. Docker Hub is the best-known public one; GitHub, GitLab and the big cloud providers each offer their own.
Why teams use it
Built images need a central place where every environment can fetch the exact same version. A registry keeps versions apart with tags, controls who can push or pull, and often scans images for known vulnerabilities. Without one, you’d be copying large files between machines by hand.
An example from work
Your deploy fails and the Kubernetes pod shows ImagePullBackOff. The pipeline built the image, but the push to the registry was skipped, so the tag the cluster asks for doesn’t exist. Pushing again, or fixing the tag in the manifest, gets the pod started.
Our own explanation, not a quote from the book.
In the book
Sentences from The Software Realm, Decoded that mention Container Registries, exactly as printed.
3 more passages about Container Registries in the full book
Read every conversation where Container Registries comes up, with the interactive slides and demos.
Where it fits
Storing and distributing Docker images
Coverage in the book
Explained and compared with alternatives, so you know where and why it’s used.
