Why do we need set up the repository before install docker

• 问题描述

  官方推荐的docker install方法是先安装repository, so what is repository?

• registry vs. repository

• docker registry

  Docker registry is a service that is storing your docker images.

  Docker registry could be hosted by a third party, as public or private registry, like one of the following registries:

  • Docker Hub
  • Quay
  • Google Container Registry
  • AWS Container Registry

  Docker Trusted Registry (DTR) is the enterprise-grade image storage solution from Docker. You install it behind your firewall so that you can securely store and manage the Docker images you use in your applications.

• docker repository

  Docker repository is a collection of different docker images with same name, that have different tags.

• 举例说明

  docker pull amouat/revealjs:latest
  

  This command will download the image tagged latest within the amouat/revealjs repository from the Docker Hub registry.

  A docker repository is a cute combination of resigtry and image:

  docker tag foo <registry>/<image>:<tag>

  is the same as

  docker tag foo <repository>:<tag>

  docker search centos # 这是再search Docker Hub registry for Repository
  

• References

1. Difference between Docker registry and repository