helm: allow customizing termination message path

By default the termination message path is set to /tmp/termination-message
to prevent issues with mounting a volume mount to /dev inside the
container(s).

Resolves galexrt#17

Signed-off-by: Alexander Trost <galexrt@googlemail.com>

Author: galexrt

charts/node-exporter-textfiles/Chart.yaml

@@ -15,7 +15,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.2
+version: 0.1.3
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to

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

@@ -35,14 +35,15 @@ spec:
             {{- toYaml .resources | nindent 12 }}
           env:
             - name: SCRIPT
-              value: "{{ .script }}"
+              value: {{ .script | quote }}
             - name: OUTPUT_FILENAME
               value: {{ .outputFilename | quote }}
             - name: INTERVAL
-              value: "{{ .interval }}"
+              value: {{ .interval | quote }}
             {{- with .additionalEnv }}
             {{- toYaml . | nindent 12 }}
             {{- end}}
+          terminationMessagePath: {{ .terminationMessagePath | default $.Values.defaultTerminationMessagePath | quote }}
           volumeMounts:
             - mountPath: /var/lib/node_exporter
               name: textfile

charts/node-exporter-textfiles/values.yaml

@@ -47,6 +47,8 @@ tolerations: []
 
 affinity: {}
 
+defaultTerminationMessagePath: "/tmp/termination-message"
+
 additionalVolumes:
   - name: textfile
     hostPath:
@@ -65,6 +67,10 @@ textfiles:
     # Defaults to `300`
     interval: 900
     additionalEnv: []
+    # If you want to customize the path, by default the termination message path
+    # is `/tmp/termination-message` to prevent issues with mounting the host's
+    # `/dev` directory
+    #terminationMessagePath: "/tmp/termination-message"
     additionalVolumeMounts:
       - mountPath: /dev
         name: host-dev