Unable to deploy prometheus-operator using helm if I enable admissionWebhooks

[Nabarun Sen]

Hi Team,

My prometheus deployment is hanging when I enable admission.webhook i am getting below error.

kubectl logs -f prometheus-operator-admission-create-fpxfj -n ns-prometheus-ops-mgmt
W0624 05:45:59.145519       1 client_config.go:548] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
log: exiting because of error: log: cannot create log: open /tmp/kube-webhook-certgen.prometheus-operator-admission-create-fpxfj.unknownuser.log.WARNING.20200624-054559.1: permission denied

I have permission of /tmp to create files.

I can able to deploy disabling it and also I have disable total  two parameter to deploy successfully.

--set prometheusOperator.admissionWebhooks.enabled=false --set prometheusOperator.tlsProxy.enabled=false ( it seems it has dependency with admissionWebhooks)

helm install prometheus-operator . -f values-custom.yaml -n ns-prometheus-ops-mgmt --set prometheusOperator.admissionWebhooks.enabled=false --set prometheusOperator.tlsProxy.enabled=false

I would like to request if there is any solution for the same as I have to enable admission.webhook because for rule syntax checking.

Thanks & Regards

Nabarun Sen