Helm: Support 'external' node_exporters (#1560)

Similar to how `exporter-kube-etcd` supports monitoring of etcd clusters
running outside the Kubernetes cluster, this patch permits to configure
`exporter-node` to *not* deploy `node_exporter` as a `DaemonSet` in the
cluster, and instead fetch metrics from pre-provisioned `node_exporter`
instances, e.g. deployed as part of the host OS.

helm/exporter-node/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: A Helm chart for Kubernetes node exporter
 name: exporter-node
-version: 0.3.3
+version: 0.4.1
 maintainers:
   - name: Giancarlo Rubio
     email: gianrubio@gmail.com

helm/exporter-node/templates/daemonset.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.enableDaemonSet }}
 apiVersion: extensions/v1beta1
 kind: DaemonSet
 metadata:
@@ -48,3 +49,4 @@ spec:
       volumes:
 {{ toYaml .Values.container.volumes | indent 6 }}
       {{- end}}
+{{- end }}

helm/exporter-node/templates/endpoints.yaml

@@ -0,0 +1,21 @@
+{{- if .Values.endpoints }}
+apiVersion: v1
+kind: Endpoints
+metadata:
+  labels:
+    app: {{ template "exporter-node.name" . }}
+    component: node-exporter
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+  name: {{ template "exporter-node.fullname" . }}
+subsets:
+  - addresses:
+      {{- range .Values.endpoints }}
+      - ip: {{ . }}
+      {{- end }}
+    ports:
+      - name: metrics
+        port: {{ .Values.nodeExporterPort }}
+        protocol: TCP
+{{- end }}

helm/exporter-node/templates/psp-clusterrole.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.enableDaemonSet }}
 {{- if .Values.global.rbacEnable }}
 {{- if .Values.global.pspEnable }}
 kind: ClusterRole
@@ -21,3 +22,4 @@ rules:
   - {{ template "exporter-node.fullname" . }}
 {{- end }}
 {{- end }}
+{{- end }}

helm/exporter-node/templates/psp-clusterrolebinding.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.enableDaemonSet }}
 {{- if .Values.global.rbacEnable }}
 {{- if .Values.global.pspEnable }}
 {{- if .Capabilities.APIVersions.Has "rbac.authorization.k8s.io/v1beta1" }}
@@ -23,3 +24,4 @@ subjects:
     namespace: {{ .Release.Namespace }}
 {{- end }}
 {{- end }}
+{{- end }}

helm/exporter-node/templates/psp.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.enableDaemonSet }}
 {{- if .Values.global.pspEnable }}
 apiVersion: extensions/v1beta1
 kind: PodSecurityPolicy
@@ -51,3 +52,4 @@ spec:
         max: 65535
   readOnlyRootFilesystem: false
 {{- end }}
+{{- end }}

helm/exporter-node/templates/service.yaml

@@ -9,6 +9,7 @@ metadata:
     release: {{ .Release.Name }}
     chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
 spec:
+{{- if .Values.enableDaemonSet }}
   type: {{ .Values.service.type }}
   ports:
   - name: metrics
@@ -19,3 +20,12 @@ spec:
     app: {{ template "exporter-node.fullname" . }}
     component: node-exporter
     release: {{ .Release.Name }}
+{{- else }}
+  type: ClusterIP
+  clusterIP: None
+  ports:
+  - name: metrics
+    port: {{ .Values.service.externalPort }}
+    protocol: TCP
+    targetPort: metrics
+{{- end }}

helm/exporter-node/templates/serviceaccount.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.enableDaemonSet }}
 {{- if .Values.global.rbacEnable }}
 apiVersion: v1
 kind: ServiceAccount
@@ -11,3 +12,4 @@ metadata:
 imagePullSecrets: 
 {{ toYaml .Values.global.imagePullSecrets | indent 2 }}
 {{- end }}
+{{- end }}

helm/exporter-node/values.yaml

@@ -65,3 +65,10 @@ additionalServiceMonitorLabels: {}
 ##Custom Labels to be added to Prometheus Rules ConfigMap
 ##
 additionalRulesConfigMapLabels: {}
+
+# deploy node_exporter as a DaemonSet
+enableDaemonSet: true
+# for deployments that have node_exporter deployed outside of the cluster, list
+# their addresses here
+endpoints: []
+nodeExporterPort: 9100

helm/kube-prometheus/Chart.yaml

@@ -7,4 +7,4 @@ maintainers:
 name: kube-prometheus
 sources:
   - https://github.com/coreos/prometheus-operator
-version: 0.0.92
+version: 0.0.93

helm/kube-prometheus/requirements.yaml

@@ -58,7 +58,7 @@ dependencies:
     repository: https://s3-eu-west-1.amazonaws.com/coreos-charts/stable/
 
   - name: exporter-node
-    version: 0.3.3
+    version: 0.4.1
     #e2e-repository: file://../exporter-node
     repository: https://s3-eu-west-1.amazonaws.com/coreos-charts/stable/
     condition: deployExporterNode