[incubator/elasticsearch] added extraInitContainers option (#7587)

* added extraInitContainers option

Signed-off-by: André Bauer <monotek23@gmail.com>

* added ci test with extrainitcontainers values

Signed-off-by: André Bauer <monotek23@gmail.com>

* updated elasticsearch to version 6.4.1
Signed-off-by: André Bauer <andre.bauer@kiwigrid.com>

* updated version also in values file
Signed-off-by: André Bauer <andre.bauer@kiwigrid.com>

incubator/elasticsearch/Chart.yaml

@@ -1,6 +1,6 @@
 name: elasticsearch
 home: https://www.elastic.co/products/elasticsearch
-version: 1.7.3
+version: 1.8.0
 appVersion: 6.4.1
 description: Flexible and powerful open source, distributed real-time search and analytics
   engine.

incubator/elasticsearch/README.md

@@ -113,6 +113,7 @@ The following table lists the configurable parameters of the elasticsearch chart
 | `data.tolerations`                   | Data tolerations                                                    | `[]`                                 |
 | `data.terminationGracePeriodSeconds` | Data termination grace period (seconds)                             | `3600`                               |
 | `data.antiAffinity`                  | Data anti-affinity policy                                           | `soft`                               |
+| `extraInitContainers`                | Additional init container passed through the tpl 	                 | ``                                   |
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`.
 
@@ -126,7 +127,7 @@ The YAML value of cluster.config is appended to elasticsearch.yml file for addit
 
 ## Application Version
 
-This chart aims to support Elasticsearch v2 and v5 deployments by specifying the `values.yaml` parameter `appVersion`.
+This chart aims to support Elasticsearch v2 to v6 deployments by specifying the `values.yaml` parameter `appVersion`.
 
 ### Version Specific Features
 
@@ -188,3 +189,11 @@ Create cluster with Storage class `ssd` on Kubernetes 1.5+
 ```
 $ helm install incubator/elasticsearch --name my-release --set data.storageClass=ssd,data.storage=100Gi
 ```
+
+### Usage of the `tpl` Function
+
+The `tpl` function allows us to pass string values from `values.yaml` through the templating engine. It is used for the following values:
+
+* `extraInitContainers`
+
+It is important that these values be configured as strings. Otherwise, installation will fail.

incubator/elasticsearch/ci/extrainitcontainers-values.yaml

@@ -0,0 +1,9 @@
+extraInitContainers: |
+  - name: "plugin-install-ingest-attachment"
+    image: "docker.elastic.co/elasticsearch/elasticsearch-oss:6.4.0"
+    command: ["/bin/bash"]
+    args: ["-c", "yes | /usr/share/elasticsearch/bin/elasticsearch-plugin install ingest-attachment"]
+  - name: "plugin-install-mapper-size"
+    image: "docker.elastic.co/elasticsearch/elasticsearch-oss:6.4.0"
+    command: ["/bin/bash"]
+    args: ["-c", "yes | /usr/share/elasticsearch/bin/elasticsearch-plugin install mapper-size"]

incubator/elasticsearch/templates/client-deployment.yaml

@@ -66,6 +66,9 @@ spec:
         command: ["sysctl", "-w", "vm.max_map_count=262144"]
         securityContext:
           privileged: true
+{{- if .Values.extraInitContainers }}
+{{ tpl .Values.extraInitContainers . | indent 6 }}
+{{- end }}
       containers:
       - name: elasticsearch
         env:

incubator/elasticsearch/templates/data-statefulset.yaml

@@ -80,6 +80,9 @@ spec:
         volumeMounts:
         - mountPath: /usr/share/elasticsearch/data
           name: data
+{{- if .Values.extraInitContainers }}
+{{ tpl .Values.extraInitContainers . | indent 6 }}
+{{- end }}
       containers:
       - name: elasticsearch
         env:

incubator/elasticsearch/templates/master-statefulset.yaml

@@ -80,6 +80,9 @@ spec:
         volumeMounts:
         - mountPath: /usr/share/elasticsearch/data
           name: data
+{{- if .Values.extraInitContainers }}
+{{ tpl .Values.extraInitContainers . | indent 6 }}
+{{- end }}
       containers:
       - name: elasticsearch
         env:

incubator/elasticsearch/values.yaml

@@ -119,3 +119,6 @@ data:
     maxUnavailable: 1
   updateStrategy:
     type: OnDelete
+
+## Additional init containers
+extraInitContainers: |