Docker Registry

A registry is a storage and content delivery system, holding named Docker images, available in different tagged versions.

1. Create a container with registry docker image

 docker container run -d -p 5000:5000 --name local_registry registry

2. Access the container on 5000 port .

curl localhost:5000/v2/_catalog

3. Inspect the container

 docker container inspect local_registry

4. Clone the ubuntu image to localhost:5000/ubuntu:latest

 docker image tag ubuntu localhost:5000/ubuntu:latest

5. Push the image to docker registry

 docker image push localhost:5000/ubuntu

6. Pull the image with following command ( you can remove the image first and then you can run below command to restore the image)

 docker image pull localhost:5000/ubuntu

Note: 

If you want to change the port the registry listens on within the container, you can use the environment variable REGISTRY_HTTP_ADDR to change it. This command causes the registry to listen on port 5001 within the container:

docker container run  -d -e REGISTRY_HTTP_ADDR=0.0.0.0:5001 -p 5001:5001 –name local_registry registry

Docker Registry in Detail

AWS ECR