Docker - Registry (Remote Image Store)

A Docker Registry is a remote store of Docker images.

Technically, a registry is an instance of the registry image, and runs within Docker.

Docker store allows you to buy and sell Docker images or distribute them for free.

• Docker Hub (default)
• Docker Cloud

• with Docker Datacenter (DDC), it includes Docker Trusted Registry (DTR).
• https://goharbor.io/ (https://labs.ovh.com/private-registry)
• nexus

Docker is configured to look for images on Docker Hub by default.

• Start your registry

docker run -d -p 5000:5000 --name registry registry:2

• Stop the registry and remove all data

docker container stop registry && docker container rm -v registry

When you use

• the docker pull or docker run commands, the required images are pulled from your configured registry.
• the docker push command, your image is pushed to your configured registry.

Example:

• Tag the image so that it points to your registry

docker image tag ubuntu localhost:5000/myfirstimage

• Push it

docker push localhost:5000/myfirstimage

• Pull it

docker pull localhost:5000/myfirstimage