[stable/zfs]: add custom priorityclass template for zfs charts (#363)

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

deploy/helm/charts/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v2
 name: zfs-localpv
 description: Helm chart for CSI Driver for dynamic provisioning of ZFS Persistent Local Volumes. For instructions on how to use this helm chart, see - https://openebs.github.io/zfs-localpv/
-version: 1.9.1
+version: 1.9.2
 appVersion: 1.9.0
 icon: https://raw.githubusercontent.com/cncf/artwork/master/projects/openebs/icon/color/openebs-icon-color.png
 home: http://www.openebs.io/

deploy/helm/charts/templates/_helpers.tpl

@@ -114,3 +114,25 @@ Create labels for openebs zfs-localpv node daemon
 {{ include "zfslocalpv.zfsNode.matchLabels" . }}
 {{ include "zfslocalpv.zfsNode.componentLabels" . }}
 {{- end -}}
+
+{{/*
+Create the name of the priority class for csi node plugin
+*/}}
+{{- define "zfslocalpv.zfsNode.priorityClassName" -}}
+{{- if .Values.zfsNode.priorityClass.create }}
+{{- printf "%s-%s" .Release.Name .Values.zfsNode.priorityClass.name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s" .Values.zfsNode.priorityClass.name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create the name of the priority class for csi controller plugin
+*/}}
+{{- define "zfslocalpv.zfsController.priorityClassName" -}}
+{{- if .Values.zfsController.priorityClass.create }}
+{{- printf "%s-%s" .Release.Name .Values.zfsController.priorityClass.name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s" .Values.zfsController.priorityClass.name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}

deploy/helm/charts/templates/priority-class.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.zfsController.priorityClass.create }}
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: {{ template "zfslocalpv.zfsController.priorityClassName" . }}
+value: 900000000
+globalDefault: false
+description: "This priority class should be used for the CStor CSI driver controller deployment only."
+{{- end }}
+---
+{{- if .Values.zfsNode.priorityClass.create }}
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: {{ template "zfslocalpv.zfsNode.priorityClassName" . }}
+value: 900001000
+globalDefault: false
+description: "This priority class should be used for the CStor CSI driver node deployment only."
+{{- end }}

deploy/helm/charts/values.yaml

@@ -46,6 +46,9 @@ zfsNode:
   tolerations: []
   securityContext: {}
   labels: {}
+  priorityClass:
+    create: true
+    name: zfs-csi-node-critical
 
 # zfsController contains the configurables for
 # the zfs controller statefulset
@@ -110,6 +113,10 @@ zfsController:
   nodeSelector: {}
   tolerations: []
   securityContext: {}
+  priorityClass:
+    create: true
+    name: zfs-csi-controller-critical
+
 
 # zfsPlugin is the common csi container used by the
 # controller statefulset and node daemonset