Add priorityClassName to filebeat chart

filebeat/README.md

@@ -66,6 +66,7 @@ helm install --name filebeat elastic/filebeat --set imageTag=7.3.0
 | `tolerations`            | Configurable [tolerations](https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/)                                                                                                                                                                         | `[]`                                                                                                                      |
 | `nodeSelector`           | Configurable [nodeSelector](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#nodeselector)                                                                                                                                                                | `{}`                                                                                                                      |
 | `affinity`               | Configurable [affinity](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity)                                                                                                                                                      | `{}`                                                                                                                      |
+| `priorityClassName`      | The [name of the PriorityClass](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#priorityclass). No default is supplied as the PriorityClass must be created first.                                                                               | ``                                                                                                                        |
 | `updateStrategy`         | The [updateStrategy](https://kubernetes.io/docs/tasks/manage-daemon/update-daemon-set/#daemonset-update-strategy) for the `DaemonSet`. By default Kubernetes will kill and recreate pods on updates. Setting this to `OnDelete` will require that pods be deleted manually. | `RollingUpdate`                                                                                                           |
 
 ## Examples

filebeat/templates/daemonset.yaml

@@ -41,6 +41,9 @@ spec:
       {{- with .Values.nodeSelector }}
       nodeSelector: {{ toYaml . | nindent 8 }}
       {{- end }}
+      {{- if .Values.priorityClassName }}
+      priorityClassName: {{ .Values.priorityClassName  }}
+      {{- end }}
       {{- with .Values.affinity }}
       affinity: {{ toYaml . | nindent 8 -}}
       {{- end }}

filebeat/tests/filebeat_test.py

@@ -216,3 +216,18 @@ def test_adding_an_affinity_rule():
     r = helm_template(config)
     assert r['daemonset'][name]['spec']['template']['spec']['affinity']['podAntiAffinity'][
         'requiredDuringSchedulingIgnoredDuringExecution'][0]['topologyKey'] == 'kubernetes.io/hostname'
+
+def test_priority_class_name():
+    config = '''
+priorityClassName: ""
+'''
+    r = helm_template(config)
+    spec = r['daemonset'][name]['spec']['template']['spec']
+    assert 'priorityClassName' not in spec
+
+    config = '''
+priorityClassName: "highest"
+'''
+    r = helm_template(config)
+    priority_class_name = r['daemonset'][name]['spec']['template']['spec']['priorityClassName']
+    assert priority_class_name == "highest"

filebeat/values.yaml

@@ -94,6 +94,10 @@ nodeSelector: {}
 
 affinity: {}
 
+# This is the PriorityClass settings as defined in
+# https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#priorityclass
+priorityClassName: ""
+
 updateStrategy: RollingUpdate
 
 # Override various naming aspects of this chart