[incubator/cassandra] Ability to override Cassandra configuration files and docker command (#8376)

* Fix Statefulset definition

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

* Ability to overrides config files and docker command

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

* Bump Chart version

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

* Fix newline

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

* Fix

Signed-off-by: Maciej Bryński <maciej.brynski@xcaliber.com>

incubator/cassandra/Chart.yaml

@@ -1,5 +1,5 @@
 name: cassandra
-version: 0.9.5
+version: 0.10.0
 appVersion: 3.11.3
 description: Apache Cassandra is a free and open-source distributed database management
   system designed to handle large amounts of data across many commodity servers, providing

incubator/cassandra/README.md

@@ -98,6 +98,9 @@ The following table lists the configurable parameters of the Cassandra chart and
 | `config.ports.thrift`                | Initdb Arguments                                | `9160`                                                     |
 | `config.ports.agent`                 | The port of the JVM Agent (if any)              | `nil`                                                      |
 | `config.start_rpc`                   | Initdb Arguments                                | `false`                                                    |
+| `configOverrides`                    | Overrides config files in /etc/cassandra dir    | `{}`                                                       |
+| `commandOverrides`                   | Overrides default docker command                | `[]`                                                       |
+| `argsOverrides`                      | Overrides default docker args                   | `[]`                                                       |
 | `env`                                | Custom env variables                            | `{}`                                                       |
 | `persistence.enabled`                | Use a PVC to persist data                       | `true`                                                     |
 | `persistence.storageClass`           | Storage class of backing PVC                    | `nil` (uses alpha storage class annotation)                |

incubator/cassandra/templates/configmap.yaml

@@ -0,0 +1,14 @@
+{{- if .Values.configOverrides }}
+kind: ConfigMap
+apiVersion: v1
+metadata:
+  name: {{ template "cassandra.name" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: {{ template "cassandra.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+data:
+{{ toYaml .Values.configOverrides | indent 2 }}
+{{- end }}

incubator/cassandra/templates/statefulset.yaml

@@ -74,6 +74,12 @@ spec:
       - name: {{ template "cassandra.fullname" . }}
         image: "{{ .Values.image.repo }}:{{ .Values.image.tag }}"
         imagePullPolicy: {{ .Values.image.pullPolicy | quote }}
+{{- if .Values.commandOverrides }}
+        command: {{ .Values.commandOverrides }}
+{{- end }}
+{{- if .Values.argsOverrides }}
+        args: {{ .Values.argsOverrides }}
+{{- end }}
         resources:
 {{ toYaml .Values.resources | indent 10 }}
         env:
@@ -137,6 +143,11 @@ spec:
         volumeMounts:
         - name: data
           mountPath: /var/lib/cassandra
+{{- range $key, $value := .Values.configOverrides }}
+        - name: cassandra-config-{{ $key | replace "." "-" }}
+          mountPath: /etc/cassandra/{{ $key }}
+          subPath: {{ $key }}
+{{- end }}
         {{- if not .Values.persistence.enabled }}
         lifecycle:
           preStop:
@@ -148,8 +159,15 @@ spec:
       imagePullSecrets:
         - name: {{ .Values.image.pullSecrets }}
       {{- end }}
-{{- if not .Values.persistence.enabled }}
+{{- if or .Values.configOverrides (not .Values.persistence.enabled) }}
       volumes:
+{{- end }}
+{{- range $key, $value := .Values.configOverrides }}
+      - configMap:
+          name: cassandra
+        name: cassandra-config-{{ $key | replace "." "-" }}
+{{- end }}
+{{- if not .Values.persistence.enabled }}
       - name: data
         emptyDir: {}
 {{- else }}

incubator/cassandra/values.yaml

@@ -67,6 +67,15 @@ config:
     # If a JVM Agent is in place
     # agent: 61621
 
+## Cassandra config files overrides
+configOverrides: {}
+
+## Cassandra docker command overrides
+commandOverrides: []
+
+## Cassandra docker args overrides
+argsOverrides: []
+
 ## Custom env variables.
 ## ref: https://hub.docker.com/_/cassandra/
 env: {}