Add support for priorityClassName (#165)

* Add support for priorityClassName

* Add unit tests

* Remove comment

* Update comment, accidentally deleted comment

* Remove whitespace

templates/injector-deployment.yaml

@@ -94,6 +94,9 @@ spec:
             periodSeconds: 2
             successThreshold: 1
             timeoutSeconds: 5
+      {{- if .Values.injector.priorityClassName }}
+      priorityClassName: {{ .Values.injector.priorityClassName }}
+      {{- end }}
 {{- if .Values.injector.certs.secretName }}
           volumeMounts:
             - name: webhook-certs

templates/server-statefulset.yaml

@@ -158,6 +158,9 @@ spec:
         {{- if .Values.server.extraContainers }}
           {{ toYaml .Values.server.extraContainers | nindent 8}}
         {{- end }}
+      {{- if .Values.server.priorityClassName }}
+      priorityClassName: {{ .Values.server.priorityClassName }}
+      {{- end }}
       {{- if .Values.global.imagePullSecrets }}
       imagePullSecrets:
         {{- toYaml .Values.global.imagePullSecrets | nindent 8 }}

test/unit/server-statefulset.bats

@@ -872,6 +872,29 @@ load _helpers
   [[ "${actual}" = *"foobar"* ]]
 }
 
+#--------------------------------------------------------------------
+# priorityClassName
+
+@test "server/standalone-StatefulSet: priorityClassName disabled by default" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -x templates/server-statefulset.yaml  \
+      . | tee /dev/stderr |
+      yq -r '.spec.template.spec.priorityClassName' | tee /dev/stderr)
+
+  [ "${actual}" = "null" ]  
+}
+
+@test "server/standalone-StatefulSet: priorityClassName enabled" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -x templates/server-statefulset.yaml  \
+      --set 'server.priorityClassName=foo' \
+      . | tee /dev/stderr |
+      yq -r '.spec.template.spec.priorityClassName' | tee /dev/stderr)
+
+  [ "${actual}" = "foo" ]  
+
 #--------------------------------------------------------------------
 # preStop
 @test "server/standalone-StatefulSet: preStop sleep duration default" {

values.yaml

@@ -81,6 +81,11 @@ injector:
   #     memory: 256Mi
   #     cpu: 250m
 
+  # priorityClassName launches injector pods with a priority class.
+  # See: https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/
+  # for more details.
+  priorityClassName: null
+
   # extraEnvironmentVars is a list of extra enviroment variables to set in the
   # injector deployment.
   extraEnvironmentVars: {}
@@ -131,6 +136,12 @@ server:
   #     cpu: 250m
 
   # Ingress allows ingress services to be created to allow external access
+  # priorityClassName launches server pods with a priority class.
+  # See: https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/
+  # for more details.
+  priorityClassName: null
+
+  # Ingress allows ingress services to be created to allow external access 
   # from Kubernetes to access Vault pods.
   ingress:
     enabled: false