[Metricbeat] Added daemonsetHostNetworking switch

metricbeat/README.md

@@ -77,6 +77,7 @@ helm install --name metricbeat elastic/metricbeat --set imageTag=7.5.1
 | `imageTag`               | The Metricbeat docker image tag                                                                                                                                                                                                                                             | `7.5.1`                                                                                                                   |
 | `imagePullPolicy`        | The Kubernetes [imagePullPolicy](https://kubernetes.io/docs/concepts/containers/images/#updating-images) value                                                                                                                                                              | `IfNotPresent`                                                                                                            |
 | `imagePullSecrets`       | Configuration for [imagePullSecrets](https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/#create-a-pod-that-uses-your-secret) so that you can use a private registry for your image                                                        | `[]`                                                                                                                      |
+| `daemonsetHostNetworking` | Parameter to enable hostNetwork on the daemonset pods.                                                                                                                                                                                                                     | `false`                                                                                                                   |
 | `labels`                 | Configurable [label](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/) applied to all Metricbeat pods                                                                                                                                              | `{}`                                                                                                                      |
 | `managedServiceAccount`  | Whether the `serviceAccount` should be managed by this helm chart. Set this to `false` in order to manage your own service account and related roles.                                                                                                                       | `true`                                                                                                                    |
 | `clusterRoleRules`       | Configurable [cluster role rules](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#role-and-clusterrole) that Metricbeat uses to access Kubernetes resources.                                                                                                  | see [values.yaml](./values.yaml)                                                                                          |

metricbeat/templates/daemonset.yaml

@@ -38,6 +38,10 @@ spec:
         {{ $key }}: {{ $value | quote }}
         {{- end }}
     spec:
+      {{- if .Values.daemonsetHostNetworking }}
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      {{- end }}
       {{- with .Values.tolerations }}
       tolerations: {{ toYaml . | nindent 6 }}
       {{- end }}

metricbeat/tests/metricbeat_test.py

@@ -207,6 +207,14 @@ def test_adding_an_affinity_rule():
     assert r['daemonset'][name]['spec']['template']['spec']['affinity']['podAntiAffinity'][
         'requiredDuringSchedulingIgnoredDuringExecution'][0]['topologyKey'] == 'kubernetes.io/hostname'
 
+def test_daemonset_host_networking():
+    config = '''
+daemonsetHostNetworking: true
+'''
+    r = helm_template(config)
+    assert r['daemonset'][name]['spec']['template']['spec']['hostNetwork'] is True
+    assert r['daemonset'][name]['spec']['template']['spec']['dnsPolicy'] == "ClusterFirstWithHostNet"
+
 def test_cluster_role_rules():
     config = ''
     r = helm_template(config)

metricbeat/values.yaml

@@ -92,6 +92,9 @@ imageTag: "7.5.1"
 imagePullPolicy: "IfNotPresent"
 imagePullSecrets: []
 
+# Setting this to true allow kibana's Infrastructure panel to have the node's name instead of the pod's name
+daemonsetHostNetworking: false
+
 livenessProbe:
   exec:
     command: