2. Set up the container registry

BinderHub will build Docker images out of Git repositories, and then push them to a Docker registry so that JupyterHub can launch user servers based on these images. You can use any registry that you like, though this guide covers how to properly configure two popular registries: the Google Container Registry (gcr.io) and DockerHub (hub.docker.com).

2.1. Set up Google Container Registry

To use Google Container Registry, you’ll need to provide BinderHub with proper credentials so it can push images. You can do so by creating a service account that has authorization to push to Google Container Registry:

  1. Go to console.cloud.google.com
  2. Make sure your project is selected
  3. Click <top-left menu w/ three horizontal bars> -> IAM & Admin -> Service Accounts menu option
  4. Click Create service account
  5. Give your account a descriptive name such as “binderhub-builder”
  6. Click Role -> Storage -> Storage Admin menu option
  7. Click Create Key
  8. Leave key type as default of JSON
  9. Click Create

These steps will download a JSON file to your computer. The JSON file contains the password that can be used to push Docker images to the gcr.io registry.

Warning

Don’t share the contents of this JSON file with anyone. It can be used to gain access to your google cloud account!

Important

Make sure to store this JSON file as you cannot generate a second one without re-doing the steps above.

2.2. Set up Docker Hub registry

To use Docker Hub as a registry first you have to create a Docker ID account in Docker Hub. Your Docker ID (username) and password are used to push Docker images to the registry.

If you want to store Docker images under an organization, you can create an organization. This is useful if different Binder instances want to use same registry to store images.

See the next section for how to properly configure your BinderHub to use Docker Hub.

2.3. Next step

Now that our cloud resources are set up, it’s time to Set up BinderHub.