Make zookeeper version customizable

repository/zookeeper/README.md

@@ -4,14 +4,21 @@ The KUDO Zookeeper operator creates, configures and manages [Apache Zookeeper](h
 
 ## Getting started
 
-The latest stable version of Zookeeper operator is `0.3.3`
+The latest stable version of Zookeeper operator is `0.3.4`
 
 ## Version Chart
 
 | KUDO Zookeeper Version | Apache Zookeeper Version |
 | ---------------------- | ------------------------ |
+| 0.3.4                  | 3.6.2                    |
 | 0.3.3                  | 3.6.2                    |
 | 0.3.2                  | 3.4.14                   |
 | 0.3.1                  | 3.4.14                   |
 | 0.3.0                  | 3.4.14                   |
 | latest                 | 3.6.2                    |
+
+## Custom Zookeeper Versions
+
+The operator contains a parameter `IMAGE_VERSION` with a default that is the current zookeeper version, normally something like `zookeeper:3.6.2`. You can change this parameter to a different image, but the operator may not run correctly, as there may be missing configuration or other changes to the default version.
+
+Additionally, if you specify the `IMAGE_VERSION` manually, you will not get an updated zookeeper version if you update the operator - in this case you will need to update the `IMAGE_VERSION` yourself on an operator update.

repository/zookeeper/operator/params.yaml

@@ -37,6 +37,9 @@ parameters:
     description: |
       The port on which the Zookeeper process will perform leader election. The default is 3888.
     default: "3888"
+  - name: IMAGE_VERSION
+    description: "Zookeeper container image"
+    default: "zookeeper:3.6.2"
   - name: IMAGE_PULL_POLICY
     description: "Zookeeper container image pull policy"
     default: "Always"

repository/zookeeper/operator/templates/statefulset.yaml

@@ -30,7 +30,7 @@ spec:
       containers:
         - name: kubernetes-zookeeper
           imagePullPolicy: {{ .Params.IMAGE_PULL_POLICY }}
-          image: "zookeeper:3.6.2"
+          image: "{{ .Params.IMAGE_VERSION }}"
           resources:
             requests:
               memory: {{ .Params.MEMORY }}

repository/zookeeper/operator/templates/validation.yaml

@@ -11,7 +11,7 @@ spec:
       containers:
         - name: kubernetes-zookeeper
           imagePullPolicy: {{ .Params.IMAGE_PULL_POLICY }}
-          image: "zookeeper:3.6.2"
+          image: "{{ .Params.IMAGE_VERSION }}"
           env:
             - name: CONN
               value: {{ if gt (int .Params.NODE_COUNT) 0 }} {{ .Name }}-zookeeper-0.{{ .Name }}-hs:{{ .Params.CLIENT_PORT }}{{- $root := . -}}{{ range $i, $v := untilStep 1 (int .Params.NODE_COUNT) 1 }},{{ $root.Name }}-zookeeper-{{ $v }}.{{ $root.Name }}-hs:{{ $root.Params.CLIENT_PORT }}{{ end }}{{ end }}