allow using custom init scripts (#11728)

stable/influxdb/Chart.yaml

 name: influxdb
-version: 1.1.3
+version: 1.1.4
 appVersion: 1.7.3
 description: Scalable datastore for metrics, events, and real-time analytics.
 keywords:

stable/influxdb/templates/deployment.yaml

@@ -65,6 +65,10 @@ spec:
           mountPath: {{ .Values.config.storage_directory }}
         - name: config
           mountPath: /etc/influxdb
+        {{- if .Values.initScripts.enabled }}
+        - name: init
+          mountPath: /docker-entrypoint-initdb.d
+        {{- end }}
       volumes:
       - name: data
       {{- if .Values.persistence.enabled }}
@@ -81,6 +85,11 @@ spec:
       - name: config
         configMap:
           name: {{ template "influxdb.fullname" . }}
+      {{- if .Values.initScripts.enabled }}
+      - name: init
+        configMap:
+          name: {{ template "influxdb.fullname" . }}-init
+      {{- end }}
     {{- if .Values.schedulerName }}
       schedulerName: "{{ .Values.schedulerName }}"
     {{- end }}

stable/influxdb/templates/init-config.yaml

+{{- if .Values.initScripts.enabled -}}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "influxdb.fullname" . }}-init
+  labels:
+    app: {{ template "influxdb.fullname" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: "{{ .Release.Name }}"
+    heritage: "{{ .Release.Service }}"
+data:
+{{ toYaml .Values.initScripts.scripts | indent 2 }}
+{{- end -}}

stable/influxdb/values.yaml

@@ -251,3 +251,14 @@ config:
     format: auto
     level: info
     supress_logo: false
+
+# Allow executing custom init scripts
+#
+# If the container finds any files with the extensions .sh or .iql inside of the
+# /docker-entrypoint-initdb.d folder, it will execute them. The order they are
+# executed in is determined by the shell. This is usually alphabetical order.
+initScripts:
+  enabled: false
+  scripts:
+    init.iql: |+
+      CREATE DATABASE "telegraf" WITH DURATION 30d REPLICATION 1 NAME "rp_30d"