Approaches for Example / Module design

The problem we're trying to solve is that various features, such as VPCs/etc, are relevant to a small set of users. It would complicate the usual cases to enable them for all cases. So we need to provide easy support for extending the examples/modules to support them in the extreme cases.

Composition is the canonical terraform approach.

Two approaches:

1. composition, which is canonical terraform

   a. commented out

   • validation

   • instructions to explain to customers are more complex

   b. conditional: validation will work, but hacky 0 indexes around in places

2. conditionals + variables

   pros:

   • simplest for customers

   • easiest to read/follow

   cons:

   • verbose interfaces

   • brittle stacks (changing variable requires changing many in hierarchy)