Image Registries

A registry is a repository used to store and access container images. Container registries can support container-based application development, often as part of DevOps processes.

Container registries save developers valuable time in the creation and delivery of cloud-native applications, acting as the intermediary for sharing container images between systems. They essentially act as a place for developers to store container images and share them out via a process of uploading (pushing) to the registry and downloading (pulling) into another system, like a Kubernetes cluster.

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Tutorial

Make sure you have Docker Desktop installed and up and running.

Login to Quay

docker login quay.io
Username: your_username
Password: your_password
Email: your_email

First we'll create a container with a single new file based off of the busybox base image:

Create a new container

docker run busybox echo "fun" > newfile

The container will immediately terminate, so we'll use the command below to list it:

docker ps -l

The next step is to commit the container to an image and then tag that image with a relevant name so it can be saved to a respository.

Replace "container_id" with your container id from the previous command.

Create a new image

docker commit container_id quay.io/your_username/repository_name

Be sure to replace "your_username" with your quay.io username and "respository_name" with a unique name for your repository.

Now that we've tagged our image with a repository name, we can push the respository to Quay Container Registry:

Push the image to Quay

docker push quay.io/your_username/repository_name

Your respository has now been pushed to Quay Container Registry!

To view your repository, click on the button below:

Repositories