[prometheus-node-exporter] Allow to opt-out node exporter rootfs mount (#757)

* [prometheus-node-exporter] make path.rootfs mount conditional

Signed-off-by: Davide Giacomini <[email protected]>

* [prometheus-node-exporter] bump minor version

Signed-off-by: Davide Giacomini <[email protected]>

* [prometheus-node-exporter] bump minor version (instead of patch)

Signed-off-by: Davide Giacomini <[email protected]>

* [prometheus-node-exporter] bump patch version

Signed-off-by: Davide Giacomini <[email protected]>

Co-authored-by: Bismarck Paliz <[email protected]>

Author: davgia

charts/prometheus-node-exporter/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: 1.1.2
 description: A Helm chart for prometheus node-exporter
 name: prometheus-node-exporter
-version: 1.16.0
+version: 1.16.1
 home: https://github.com/prometheus/node_exporter/
 sources:
 - https://github.com/prometheus/node_exporter/

charts/prometheus-node-exporter/templates/daemonset.yaml

@@ -38,7 +38,9 @@ spec:
           args:
             - --path.procfs=/host/proc
             - --path.sysfs=/host/sys
+            {{- if .Values.hostRootFsMount }}
             - --path.rootfs=/host/root
+            {{- end }}
             - --web.listen-address=$(HOST_IP):{{ .Values.service.port }}
 {{- if .Values.extraArgs }}
 {{ toYaml .Values.extraArgs | indent 12 }}
@@ -77,10 +79,12 @@ spec:
             - name: sys
               mountPath: /host/sys
               readOnly: true
+            {{- if .Values.hostRootFsMount }}
             - name: root
               mountPath: /host/root
               mountPropagation: HostToContainer
               readOnly: true
+            {{- end }}
             {{- if .Values.extraHostVolumeMounts }}
             {{- range $_, $mount := .Values.extraHostVolumeMounts }}
             - name: {{ $mount.name }}
@@ -146,9 +150,11 @@ spec:
         - name: sys
           hostPath:
             path: /sys
+        {{- if .Values.hostRootFsMount }}
         - name: root
           hostPath:
             path: /
+        {{- end }}
         {{- if .Values.extraHostVolumeMounts }}
         {{- range $_, $mount := .Values.extraHostVolumeMounts }}
         - name: {{ $mount.name }}

charts/prometheus-node-exporter/values.yaml

@@ -80,6 +80,10 @@ endpoints: []
 # Expose the service to the host network
 hostNetwork: true
 
+## If true, node-exporter pods mounts host / at /host/root
+##
+hostRootFsMount: true
+
 ## Assign a group of affinity scheduling rules
 ##
 affinity: {}