Image Building and Caching

Whole Tale uses an extension to Project Jupyter’s repo2docker to build container images based on a set of configuration files found in the tale workspace. Beginning with version 1.1, container images are built only using the repo2docker configuration files and any extra files specified using the extra_build_files advanced settings option.

The image tag is created as a combination of checksums from:

1. repo2docker configuration files

2. tale image object configuration

3. Dockerfile created by r2d using files from above

With this, any tales that have a common environment configuration and images built using the same version of repo2docker will share a container image. This improves build performance and caching efficiency on the platform.