multiple notebook docker images or kernels

[rabernat]

How do we ensure that notebooks created on our clusters are always run-able, even as the notebook images evolve? The only choice I see is to have some sort of versioning system, which allows users to select past versions of their environments. There are two ways this could work:

• At the notebook docker image level (i.e. use ProfileList to provide a choice of images)
• At the kernel level: we somehow make available many different kernels within a single notebook image, and notebooks created with a certain kernel will always open with that kernel

Has anyone thought about how to solve this problem?