Explain when to use which kind of base image

[clelange]

This question was asked during the afternoon.

Other questions:

• who "owns" singularity

• why did CMS choose singularity

• does ATLAS use singularity as well

• what is kubernetes

• the scope of building this complicated image - having own analysis code

• the role of "two layers" -> add sketch

• what is specific in this image (grid proxies etc)

• are there three docker environments (in the figure, related to sketch to be added)?

• how big is "the CVMFS image", referring actually to the automount image

• are the (env) variables (in build_docker) defined

• why create the AnalysisCode directory