[metricbeat] add host networking option

metricbeat/README.md

@@ -72,6 +72,7 @@ helm install --name metricbeat elastic/metricbeat --set imageTag=7.6.2
 | `daemonset.extraEnvs`          | Extra [environment variables][] which will be appended to Metricbeat container for `DaemonSet`.                                                                                  | `[]`                                                                                                                      |
 | `daemonset.extraVolumes`       | Templatable string of additional volumes to be passed to the `tpl` function or `DaemonSet`.                                                                                      | `[]`                                                                                                                      |
 | `daemonset.extraVolumeMounts`  | Templatable string of additional volumeMounts to be passed to the `tpl` function or `DaemonSet`.                                                                                 | `[]`                                                                                                                      |
+| `daemonset.hostNetworking`     | Enable Metricbeat `DaemonSet` to use host network                                                                                                                                | `false`                                                                                                                   |
 | `daemonset.metricbeatConfig`   | Allows you to add any config files in `/usr/share/metricbeat` such as `metricbeat.yml` for Metricbeat `DaemonSet`.                                                               | see [values.yaml][]                                                                                                       |
 | `daemonset.nodeSelector`       | Configurable [nodeSelector][] for Metricbeat `DaemonSet`.                                                                                                                        | `{}`                                                                                                                      |
 | `daemonset.secretMounts`       | Allows you easily mount a secret as a file inside the `DaemonSet`. Useful for mounting certificates and other secrets. See [values.yaml][] for an example                        | `[]`                                                                                                                      |

metricbeat/templates/daemonset.yaml

@@ -41,6 +41,10 @@ spec:
       affinity: {{ toYaml ( .Values.affinity | default .Values.daemonset.affinity ) | nindent 8 }}
       nodeSelector: {{ toYaml ( .Values.nodeSelector | default .Values.daemonset.nodeSelector ) | nindent 8 }}
       tolerations: {{ toYaml ( .Values.tolerations | default .Values.daemonset.tolerations ) | nindent 8 }}
+      {{- if .Values.daemonset.hostNetworking }}
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      {{- end }}
       {{- if .Values.priorityClassName }}
       priorityClassName: {{ .Values.priorityClassName  }}
       {{- end }}

metricbeat/tests/metricbeat_test.py

@@ -28,6 +28,18 @@ def test_defaults():
     assert "metricbeat test output" in c["readinessProbe"]["exec"]["command"][-1]
 
     assert r["daemonset"][name]["spec"]["template"]["spec"]["tolerations"] == []
+
+    assert "hostNetwork" not in r["daemonset"][name]["spec"]["template"]["spec"]
+    assert "dnsPolicy" not in r["daemonset"][name]["spec"]["template"]["spec"]
+    assert (
+        "hostNetwork"
+        not in r["deployment"][name + "-metrics"]["spec"]["template"]["spec"]
+    )
+    assert (
+        "dnsPolicy"
+        not in r["deployment"][name + "-metrics"]["spec"]["template"]["spec"]
+    )
+
     assert (
         r["deployment"][name + "-metrics"]["spec"]["template"]["spec"]["tolerations"]
         == []
@@ -249,6 +261,27 @@ def test_adding_image_pull_secrets():
     )
 
 
+def test_adding_host_networking():
+    config = """
+daemonset:
+  hostNetworking: true
+"""
+    r = helm_template(config)
+    assert r["daemonset"][name]["spec"]["template"]["spec"]["hostNetwork"] is True
+    assert (
+        r["daemonset"][name]["spec"]["template"]["spec"]["dnsPolicy"]
+        == "ClusterFirstWithHostNet"
+    )
+    assert (
+        "hostNetwork"
+        not in r["deployment"][name + "-metrics"]["spec"]["template"]["spec"]
+    )
+    assert (
+        "dnsPolicy"
+        not in r["deployment"][name + "-metrics"]["spec"]["template"]["spec"]
+    )
+
+
 def test_adding_tolerations():
     config = """
 daemonset:

metricbeat/values.yaml

@@ -16,6 +16,7 @@ daemonset:
   # - name: extras
   #   mountPath: /usr/share/extras
   #   readOnly: true
+  hostNetworking: false
   # Allows you to add any config files in /usr/share/metricbeat
   # such as metricbeat.yml for daemonset
   metricbeatConfig: