cloudbank-hubs-image for 2i2c cloudbank cluster

This is the standard hub-user-image with one change -- the otter-grader version is updated to 4.2.0

It was built using a template repository for creating dedicated user images for our hubs.

About this template repository

• It enables jupyterhub/repo2docker-action. This GitHub action builds a Docker image using the contents of this repo and pushes it to the Quay.io registry.

• It provides an example of a environment.yml conda configuration file. This file can be used to list all the conda packages that need to be installed by repo2docker in your environment. The repo2docker-action will update the base repo2docker conda environment with the packages listed in this environment.yml file.

Note: A complete list of possible configuration files that can be added to the repository and be used by repo2docker to build the Docker image, can be found in the repo2docker docs.

How to create and use a custom user image for your hub

1. Use this template

Create a new repository from hub-user-image-template repository, by clicking the Use this template button located at the top of this project's GitHub page.

2. Hook the new repository to quay.io

Follow all the instructions (except the last step), provided by the repo2docker-action docs on how to allow the built image to be pushed to quay.io.

When you have completed these steps, you should have:

• a quay.io repository of the form quay.io/<quay-username>/<repository-name>

• two GitHub secrets QUAY_USERNAME (the user name of the quay.io robot account) and QUAY_PASSWORD (the password of the quay.io robot account) set on your newly created GitHub repository.

  

3. Update repo2docker-action config

Edit lines 24 and 25 of build.yaml and:

• uncomment the IMAGE_NAME option
• replace <quay-username>/<repository-name> with the info of the quay.io repository created at step 2
• Commit the changes you've made to build.yaml

Edit lines 20 and 21 of test.yaml in the same way.

4. Define the environment wanted

• Modify the environment.yml file and add all the packages you want installed in the conda environment. Note that repo2docker already installs this list of packages. More about what you can do with environment.yml, can be found in the repo2docker docs.

• Commit the changes made to environment.yml.

• Create a pull request with this commit, or push it dirrectly to the main branch.

• If you merge the PR above or directly push the commit to the main branch, the GitHub Action will automatically build and push the container image. Wait for this action to finish.

5. Build and push the image of the repository

Images generated by this action are automatically tagged with both latest and <SHA> corresponding to the relevant commit SHA on GitHub. Both tags are pushed to the image registry specified by the user. If an existing image with the latest tag already exists in your registry, this Action attempts to pull that image as a cache to reduce uncessary build steps.

Checkout an example of a quay.io respository that hosts the user environment image of a 2i2c hub.

6. Connect the hub with this user image

• Go to the list of image tags on quay.io, and find the tag of the last push. This is not the latest tag but is usually under it. Use this to construct your image name - quay.io/<quay-username>/<repository-name>:<tag>.

  

• Open the Configurator for the hub (you need to be logged in as an admin). You can access it from the hub control panel, under Services in the top bar or by going to https:///services/configurator/

  

• Make a note of the current image name there.

• Put the image tag you constructed in a previous step into the User docker image text box.

• Click Submit! this is alpha level software, so there is no 'has it saved' indicator yet :)

You can find more information about the Configurator here.

7. Test the new image

Test the new image by starting a new user server! If you already had one running, you need to stop and start it again to test. If you find new issues, you can revert back to the previous image by entering the old image name, back in the JupyterHub Configurator.

This will be streamlined in the future.

Push image to a registry other than Quay.io

The jupyterhub/repo2docker-action can build and push the image to registries other than Quay.io. Checkout the action docs for the instructions on how to setup your workflow to push to: AWS Elastic Container Registry, Google Container Registry (deprecated but popular), Google Artifact Registry (preferred), Azure Container Registry.

Note: For cloud provider-specific registries, if we are running the cluster on our projects, please contact the 2i2c team to give you credentials for it.