Feature Request: Fail when PDB is set and replica is < 2

[jkleinlercher]

In https://github.com/zegl/kube-score/blob/47b5ae268cec7e6ffb50fa5d1848fb3c15f3fc97/score/disruptionbudget/disruptionbudget.go#L41 kube-score already checks if replicas < 2 ignore the check that a PDB must be set. However, wouldn‘t it be good that if replicas < 2 a PDB must NOT be set because it will prevent node drain operations from succeeding. Any operation that needs to kill that single replica will conflict with the PodDisruptionBudget that is defined.

so I would love to see a seperate test which checks such a constellation.

Any thoughts about that?

[jkleinlercher]

Hm, while reading https://blogs.infosupport.com/how-not-to-configure-pod-disruption-budget/ I learned the topic PDB is maybe more complicated than I thought …