Add ability to set in-memory temp volume mount

[hlascelles]

Is your feature request related to a problem ?

We are seeing disk IO exhaustion as Kustomize uses the temp volume.

One recommendation, which we have done successfully using manual patching, is to mount the temp folder as in-memory.

However, as it stands that isn't possible with the helm chart, as it always writes out the first temp mount, no matter what values are supplied.

Can we change the chart so that this temp mount can be disabled?

It is force set here:

helm-charts/charts/flux2/templates/kustomize-controller.yaml

Line 112 in e07cfac

volumeMounts:

And similarly in the other controllers.

We would like to provide config like this:

kustomizeController:
  volumes:
  - name: temp
    emptyDir:
      sizeLimit: 1000Mi
      medium: Memory
  volumeMounts:
  - name: temp
    mountPath: /tmp

but we see errors that mappings for "/tmp" are duplicated.

Describe the solution you'd like.

Have config that allows disabling writing out the standard temp folder. Or maybe a "smart all in one config" that is "use in-memory config for temp folder".

Describe alternatives you've considered.

Working from a fork of the helm chart, but that is not long term.

Additional context.

Discussed here: fluxcd/flux2#3380 (reply in thread)