kustomize: namespace in common name of cert-manager certificate (variable inside string)

Question

I want to create a cert-manager certificate using kustomize, where the string of the commonName-Field contains the namespace. Is this possible?

Answer 1

There is no such option to achieve it with Kustomize right out of the box.

Thankfully Kustomize offers a plugin framework, that allows you to write your own "transformation" plugin.

You could create it based on existing set of plugins from Agilicus, released under Apache 2.0 license, specifically on the resemblance of the their certificatetransformer plugin, where you would need to modify it to match your needs.

So instead of letting it to replace namespace in Certificate resource, you would need to play around it with modifications on ['spec']['commonName'] list.