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moby--moby/docs/sources/terms/repository.md
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page_title: Repository page_description: Definition of an Repository page_keywords: containers, concepts, explanation, image, repository, container

Repository

Introduction

A repository is a set of images either on your local Docker server, or shared, by pushing it to a Registry server.

Images can be associated with a repository (or multiple) by giving them an image name using one of three different commands:

  1. At build time (e.g., sudo docker build -t IMAGENAME),
  2. When committing a container (e.g., sudo docker commit CONTAINERID IMAGENAME) or
  3. When tagging an image id with an image name (e.g., sudo docker tag IMAGEID IMAGENAME).

A Fully Qualified Image Name (FQIN) can be made up of 3 parts:

[registry_hostname[:port]/][user_name/](repository_name:version_tag)

username and registry_hostname default to an empty string. When registry_hostname is an empty string, then docker push will push to index.docker.io:80.

If you create a new repository which you want to share, you will need to set at least the user_name, as the default blank user_name prefix is reserved for official Docker images.

For more information see Working with Repositories