[stable/kube-slack] add ConfigMap (#11883)

* add ConfigMap and add it to Deployment

Signed-off-by: Syunsuke Komma <syunsuke@weseek.co.jp>

* update README

Signed-off-by: Syunsuke Komma <syunsuke@weseek.co.jp>

stable/kube-slack/Chart.yaml

@@ -1,5 +1,5 @@
 name: kube-slack
-version: 0.4.0
+version: 0.4.1
 appVersion: v3.6.0
 apiVersion: v1
 description: Chart for kube-slack, a monitoring service for Kubernetes

stable/kube-slack/README.md

@@ -24,7 +24,9 @@ $ helm delete my-release
 
 ## Configuration
 
-All configuration parameters are listed in [`values.yaml`](values.yaml). It is required to set the `slackUrl` value.
+All configuration parameters are listed in [`values.yaml`](values.yaml).
+
+The environment values passed to kube-slack can be described in `envVars` parameter. At a minimum, the `envVars.SLACK_URL` value must be set.
 
 ## RBAC
 By default the chart will install the recommended RBAC roles and rolebindings.

stable/kube-slack/templates/configmap.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "kube-slack.fullname" . }}
+  labels:
+    app: {{ template "kube-slack.name" . }}
+    chart: {{ template "kube-slack.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+data:
+{{ toYaml .Values.envVars | indent 2 }}

stable/kube-slack/templates/deployment.yaml

@@ -15,6 +15,8 @@ spec:
       release: {{ .Release.Name }}
   template:
     metadata:
+      annotations:
+        checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
       labels:
         app: {{ template "kube-slack.name" . }}
         release: {{ .Release.Name }}
@@ -23,11 +25,9 @@ spec:
         - name: {{ .Chart.Name }}
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
-          env:
-            - name: SLACK_URL
-              value: {{ .Values.slackUrl }}
-            - name: NOT_READY_MIN_TIME
-              value: {{ .Values.notReadyMinTime | quote }}
+          envFrom:
+            - configMapRef:
+                name: {{ template "kube-slack.fullname" . }}
           resources:
 {{ toYaml .Values.resources | indent 12 }}
     {{- if .Values.rbac.create }}

stable/kube-slack/values.yaml

@@ -1,7 +1,9 @@
-## URL of your Incoming Webhook in Slack:
-slackUrl: ""
-## Time to wait after pod becomes not ready before notifying
-notReadyMinTime: 60000  # in ms
+## Environment values for the deployment
+envVars:
+  ## URL of your Incoming Webhook in Slack:
+  SLACK_URL: ""
+  ## Time to wait after pod becomes not ready before notifying
+  NOT_READY_MIN_TIME: "60000"  # in ms
 
 ## Configuration for the deployment:
 image: