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We maintain a “registry of registries” ( (one registry to rule them all…) where you can easily have your registry’s public images available for others to find. Adding your registry is easy - it comes down to automatically generating a file, adding it to the repo, and then doing a pull request (PR). Specifically:

1. Fork the repo

Fork the repo, and clone to your machine. That might look like this, given a username vsoch:

git clone
cd containers

2. Generate your Metadata

Then use the manager to generate a markdown file for your registry. In this example, we have interactively shelled inside the uwsgi image for our sregistry like docker run -it <container> bash and are sitting in the /code folder.

# Inside the image
$ python register

Registry template written to!

Your robot is at
1. Fork and clone
2. Add to the registries folder
3. Download your robot (or add custom institution image) under assets/img/[custom/robots]
4. Submit a PR to validate your registry.

Specifically, this produces a markdown file in the present working directory (which is mapped to your host) that can be plopped into a folder. It is named based on your registry uri, and looks like this:

$ cat
layout: registry
title:  "Tacosaurus Computing Center"
date:   2017-08-30 17:45:44
author: vsochat
- registry
img: robots/robot5413.png
thumb: robots/robot5413.png # wget
tagged: taco
institution: Tacosaurus Computing Center

Tacosaurus Computing Center is a Singularity Registry to provide institution level Singularity containers.

At this point, you can send this file to @vsoch and she will be happy to add your registry to the… registry! If you want to customize your robot image, or submit the file yourself via a pull request, continue reading!

3. Choose your image

For the image and thumbnail, we have a database of robots that we have randomly selected a robot for you. If you don’t like your robot, feel free to browse and choose a different one. Importantly, you will need to add the robot to the github repo:

cd containers/assets/img/robots

If you have some other custom image, add it to the “custom” folder. If it’s not created yet, make it.

cd containers/assets/img
mkdir -p custom
cd custom
mv /path/to/institution/logo/taco-logo.png

Then for each of the thumb and img fields you would want to look like this:

img: custom/taco-logo.png
thumb: custom/taco-logo.png

4. Submit a PR

You can then add your files, and submit a PR to the main repo. We will have tests that ping your registry to ensure correct naming of files and registry address, along with a preview of the content that is added. If you want to preview locally, you can run jekyll serve.

Great! Now that you have your accounts, you probably want to learn about how to build and push images! To push directly, you will first need to generate a credential. If you have enabled the Google Build+Github plugin, then you will be able to log in with GitHub, and connect GitHub repositories to build on commit. Either way, you should next read about the client.