Fix DNS lookup failure error for host URLs

metricbeat/README.md

@@ -84,6 +84,8 @@ helm install --name metricbeat elastic/metricbeat --set imageTag=7.6.0
 | `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](https://github.com/elastic/helm-charts/tree/master/metricbeat/values.yaml)                              |
 | `podAnnotations`         | Configurable [annotations](https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/) applied to all Metricbeat pods                                                                                                                                                                                | `{}`                                                                                                                      |
 | `podSecurityContext`     | Configurable [podSecurityContext](https://kubernetes.io/docs/tasks/configure-pod-container/security-context/) for Metricbeat pod execution environment                                                                                                                                                                   | `runAsUser: 0`<br>`privileged: false`                                                                                     |
+| `hostNetworking`         | Use host networking in the daemonset so that hostname is reported correctly. **NOTE**: daemonset only | false
+| `dnsPolicy`              | Configurable [dnsPolicy](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/) **NOTE**: daemonset only | `ClusterFirst`
 | `livenessProbe`          | Parameters to pass to [liveness probe](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/) checks for values such as timeouts and thresholds.                                                                                                                                 | `failureThreshold: 3`<br>`initialDelaySeconds: 10`<br>`periodSeconds: 10`<br>`successThreshold: 3`<br>`timeoutSeconds: 5` |
 | `readinessProbe`         | Parameters to pass to [readiness probe](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/) checks for values such as timeouts and thresholds.                                                                                                                                | `failureThreshold: 3`<br>`initialDelaySeconds: 10`<br>`periodSeconds: 10`<br>`successThreshold: 3`<br>`timeoutSeconds: 5` |
 | `resources`              | Allows you to set the [resources](https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/) for the `DaemonSet`                                                                                                                                                                             | `requests.cpu: 100m`<br>`requests.memory: 100Mi`<br>`limits.cpu: 1000m`<br>`limits.memory: 200Mi`                         |

metricbeat/templates/daemonset.yaml

@@ -91,6 +91,8 @@ spec:
       initContainers:
 {{ tpl .Values.extraInitContainers . | indent 6 }}
       {{- end }}
+      hostNetwork: {{ .Values.hostNetwork | default false }}
+      dnsPolicy: {{ .Values.dnsPolicy | default "ClusterFirst" }}
       containers:
       - name: "metricbeat"
         image: "{{ .Values.image }}:{{ .Values.imageTag }}"

metricbeat/tests/metricbeat_test.py

@@ -47,6 +47,28 @@ def test_defaults():
     } in volumes
 
 
+def test_override_the_default_host_network_option():
+    config = """
+hostNetwork: true
+"""
+    r = helm_template(config)
+    assert (
+        r["daemonset"][name]["spec"]["template"]["spec"]["hostNetwork"]
+        == True
+    )
+
+
+def test_override_the_default_dns_policy_option():
+    config = """
+dnsPolicy: ClusterFirstWithHostNet
+"""
+    r = helm_template(config)
+    assert (
+        r["daemonset"][name]["spec"]["template"]["spec"]["dnsPolicy"]
+        == "ClusterFirstWithHostNet"
+    )
+
+
 def test_adding_a_extra_container():
     config = """
 extraContainers: |

metricbeat/values.yaml

@@ -190,6 +190,9 @@ nodeSelector: {}
 
 affinity: {}
 
+hostNetwork: false
+dnsPolicy: "ClusterFirst"
+
 # This is the PriorityClass settings as defined in
 # https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#priorityclass
 priorityClassName: ""