Zookeeper cluster first version

bitnami/zookeeper/README.md

@@ -52,7 +52,7 @@ The following tables lists the configurable parameters of the Zookeeper chart an
 | `image.pullSecrets`                   | Specify image pull secrets                                          | `nil` (does not add image pull secrets to deployed pods) |
 | `image.debug`                         | Specify if debug values should be set                               | `false`                                                  |
 | `updateStrategy`                      | Update strategies                                                   | `RollingUpdate`                                          |
-| `serverID`                            | ID of the server in the ensemble                                    | `1`                                                      |
+| `replicaCount`                        | Number of ZooKeeper nodes                                           | `1`                                                      |
 | `tickTime`                            | Basic time unit in milliseconds used by ZooKeeper for heartbeats    | `2000`                                                   |
 | `initLimit`                           | Time the ZooKeeper servers in quorum have to connect to a leader    | `10`                                                     |
 | `syncLimit`                           | How far out of date a server can be from a leader                   | `5`                                                      |

bitnami/zookeeper/templates/statefulset.yaml

@@ -9,7 +9,7 @@ metadata:
     heritage: {{ .Release.Service | quote }}
 spec:
   serviceName: {{ template "zookeeper.fullname" . }}-headless
-  replicas: 1
+  replicas: {{ .Values.replicaCount }}
   updateStrategy:
     type: {{ .Values.updateStrategy | quote }}
   selector:
@@ -50,13 +50,30 @@ spec:
       - name: "{{ template "zookeeper.fullname" . }}"
         image: "{{ template "zookeeper.image" . }}"
         imagePullPolicy: {{ .Values.image.pullPolicy | quote }}
+        command:
+         - bash
+         - -ec
+         - |
+            # Execute entrypoint as usual after obtaining ZOO_SERVER_ID based on POD hostname
+            HOST=`hostname -s`
+            if [[ $HOST =~ (.*)-([0-9]+)$ ]]; then
+              ORD=${BASH_REMATCH[2]}
+              export ZOO_SERVER_ID=$((ORD+1))
+            else
+              echo "Failed to get index from hostname $HOST"
+              exit 1
+            fi
+            . /opt/bitnami/base/functions
+            . /opt/bitnami/base/helpers
+            print_welcome_page
+            . /init.sh
+            nami_initialize zookeeper
+            exec tini -- /run.sh
         resources:
 {{ toYaml .Values.Resources | indent 10 }}
         env:
         - name: ZOO_PORT_NUMBER
           value: {{ .Values.service.port | quote }}
-        - name: ZOO_SERVER_ID
-          value: {{ .Values.serverID | quote }}
         - name: ZOO_TICK_TIME
           value: {{ .Values.tickTime | quote }}
         - name: ZOO_INIT_LIMIT
@@ -66,7 +83,11 @@ spec:
         - name: ZOO_MAX_CLIENT_CNXNS
           value: {{ .Values.maxClientCnxns | quote }}
         - name: ZOO_SERVERS
-          value: {{ .Values.servers | quote }}
+          {{- $replicaCount := int .Values.replicaCount }}
+          {{- $name := default .Chart.Name .Values.nameOverride -}}
+          {{- $zookeeperFullname := printf "%s-%s" .Release.Name $name | trunc 24  }}
+          {{- $zookeeperHeadlessServiceName := printf "%s-%s" $zookeeperFullname "headless" | trunc 24  }}
+          value: {{range $i, $e := until $replicaCount }}{{ $zookeeperHostname }}-{{ $e }}.{{ $zookeeperHeadlessServiceName }}:2888:3888 {{ end }}
         {{- if .Values.auth.enabled }}
         - name: ZOO_ENABLE_AUTH
           value: "yes"

bitnami/zookeeper/values.yaml

@@ -27,9 +27,9 @@ image:
 ##
 updateStrategy: RollingUpdate
 
-## ID of the server in the ensemble
+## Number of ZooKeeper nodes
 ##
-serverID: 1
+replicaCount: 1
 
 ## Basic time unit in milliseconds used by ZooKeeper for heartbeats
 ##