add capability to specify alternalte scheduler

elasticsearch/README.md

@@ -100,6 +100,7 @@ helm install --name elasticsearch elastic/elasticsearch --version 7.1.0 --set im
 | `nodeSelector`             | Configurable [nodeSelector](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#nodeselector) so that you can target specific nodes for your Elasticsearch cluster                                                                                                                                          | `{}`                                                                                                                      |
 | `tolerations`              | Configurable [tolerations](https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/)                                                                                                                                                                                                                        | `[]`                                                                                                                      |
 | `ingress`                  | Configurable [ingress](https://kubernetes.io/docs/concepts/services-networking/ingress/) to expose the Elasticsearch service. See [`values.yaml`](./values.yaml) for an example                                                                                                                                            | `enabled: false`                                                                                                          |
+| `schedulerName`            | Name of the [alternate scheduler](https://kubernetes.io/docs/tasks/administer-cluster/configure-multiple-schedulers/#specify-schedulers-for-pods)  | `nil`  |
 
 ## Try it out
 

elasticsearch/templates/statefulset.yaml

@@ -45,6 +45,9 @@ spec:
         configchecksum: {{ include (print .Template.BasePath "/configmap.yaml") . | sha256sum | trunc 63 }}
         {{- end }}
     spec:
+      {{- if .Values.schedulerName }}
+      schedulerName: "{{ .Values.schedulerName }}"
+      {{- end }}
       securityContext:
         fsGroup: {{ .Values.fsGroup }}
       {{- with .Values.tolerations }}

elasticsearch/tests/elasticsearch_test.py

@@ -569,3 +569,15 @@ def test_priority_class_name():
     r = helm_template(config)
     priority_class_name = r['statefulset'][uname]['spec']['template']['spec']['priorityClassName']
     assert priority_class_name == "highest"
+
+
+def test_scheduler_name():
+    r = helm_template('')
+    spec = r['statefulset'][uname]['spec']['template']['spec']
+    assert 'schedulerName' not in spec
+
+    config = '''
+schedulerName: "stork"
+'''
+    r = helm_template(config)
+    assert r['statefulset'][uname]['spec']['template']['spec']['schedulerName'] == "stork"

elasticsearch/values.yaml

@@ -142,6 +142,11 @@ readinessProbe:
 # https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-health.html#request-params wait_for_status
 clusterHealthCheckParams: "wait_for_status=green&timeout=1s"
 
+## Use an alternate scheduler.
+## ref: https://kubernetes.io/docs/tasks/administer-cluster/configure-multiple-schedulers/
+##
+schedulerName: ""
+
 imagePullSecrets: []
 nodeSelector: {}
 tolerations: []