integrate suggestions for PDB enhancements

charts/nfs-subdir-external-provisioner/templates/_helpers.tpl

@@ -61,6 +61,17 @@ Return the appropriate apiVersion for podSecurityPolicy.
 {{- end -}}
 {{- end -}}
 
+{{/*
+Return the appropriate apiVersion for podDisruptionBudget.
+*/}}
+{{- define "podDisruptionBudget.apiVersion" -}}
+{{- if semverCompare ">=1.21-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "policy/v1" -}}
+{{- else -}}
+{{- print "policy/v1beta1" -}}
+{{- end -}}
+{{- end -}}
+
 {{/*
 Common labels
 */}}

charts/nfs-subdir-external-provisioner/templates/poddisruptionbudget.yaml

@@ -1,14 +1,13 @@
-{{ if gt .Values.replicaCount 1.0}}
-apiVersion: policy/v1
+{{- if .Values.podDisruptionBudget.enabled }}
+apiVersion: {{ template "podDisruptionBudget.apiVersion" . }}
 kind: PodDisruptionBudget
 metadata:
   labels:
     {{- include "nfs-subdir-external-provisioner.labels" . | nindent 4 }}
   name: {{ template "nfs-subdir-external-provisioner.fullname" . }}
-  namespace: {{ .Release.Namespace }}
 spec:
-  maxUnavailable: 1
+    maxUnavailable: {{ .Values.podDisruptionBudget.maxUnavailable | default 1 }}
   selector:
     matchLabels:
       {{- include "nfs-subdir-external-provisioner.selectorLabels" . | nindent 6 }}
-{{ end }}
+{{- end }}

charts/nfs-subdir-external-provisioner/values.yaml

@@ -108,3 +108,7 @@ affinity: {}
 
 # Additional labels for any resource created
 labels: {}
+
+podDisruptionBudget:
+  enabled: false
+  maxUnavailable: 1