[elasticsearch] add example for microk8s

elasticsearch/README.md

@@ -287,6 +287,18 @@ cd examples/kubernetes-kind
 make
 ```
 
+#### MicroK8S
+
+It is also possible to run this chart using [MicroK8S](https://microk8s.io):
+
+```
+microk8s.enable dns
+microk8s.enable helm
+microk8s.enable storage
+cd examples/microk8s
+make
+```
+
 ## Clustering and Node Discovery
 
 This chart facilitates Elasticsearch node discovery and services by creating two `Service` definitions in Kubernetes, one with the name `$clusterName-$nodeGroup` and another named `$clusterName-$nodeGroup-headless`.

elasticsearch/examples/microk8s/Makefile

@@ -0,0 +1,12 @@
+default: test
+
+RELEASE := helm-es-microk8s
+
+install:
+	helm upgrade --wait --timeout=900 --install --values values.yaml $(RELEASE) ../../
+
+test: install
+	helm test $(RELEASE)
+
+purge:
+	helm del --purge $(RELEASE)

elasticsearch/examples/microk8s/README.md

@@ -0,0 +1,16 @@
+# MicroK8S
+
+An example of configuration for deploying Elasticsearch chart on [MicroK8S][].
+
+Note that this configuration should be used for test only and isn't recommended
+for production.
+
+## Requirements
+
+The following MicroK8S [addons][] need to be enabled:
+- `dns`
+- `helm`
+- `storage`
+
+[MicroK8S]: https://microk8s.io
+[Addons]: https://microk8s.io/docs/addons

elasticsearch/examples/microk8s/values.yaml

@@ -0,0 +1,32 @@
+---
+# Disable privileged init Container creation.
+sysctlInitContainer:
+  enabled: false
+
+# Restrict the use of the memory-mapping when sysctlInitContainer is disabled.
+esConfig:
+  elasticsearch.yml: |
+    node.store.allow_mmap: false
+
+# Permit co-located instances for solitary minikube virtual machines.
+antiAffinity: "soft"
+
+# Shrink default JVM heap.
+esJavaOpts: "-Xmx128m -Xms128m"
+
+# Allocate smaller chunks of memory per pod.
+resources:
+  requests:
+    cpu: "100m"
+    memory: "512M"
+  limits:
+    cpu: "1000m"
+    memory: "512M"
+
+# Request smaller persistent volumes.
+volumeClaimTemplate:
+  accessModes: [ "ReadWriteOnce" ]
+  storageClassName: "microk8s-hostpath"
+  resources:
+    requests:
+      storage: 100M