Issue 63: Added support for ephemeral storage

README.md

@@ -11,6 +11,7 @@ The project is currently alpha. While no breaking API changes are currently plan
  * [Usage](#usage)    
     * [Installation of the Operator](#install-the-operator)
     * [Deploy a sample Zookeeper Cluster](#deploy-a-sample-zookeeper-cluster)
+    * [Deploy a sample ZooKeeper Cluster with Ephemeral Storage](#Deploy-a-sample-zookeeper-cluster-with-ephemeral-storage)
     * [Deploy a sample Zookeeper Cluster to a cluster using Istio](#deploy-a-sample-zookeeper-cluster-with-istio)
     * [Upgrade a Zookeeper Cluster](#upgrade-a-zookeeper-cluster)
     * [Uninstall the Zookeeper Cluster](#uninstall-the-zookeeper-cluster)
@@ -131,6 +132,35 @@ svc/example-client     ClusterIP   10.31.243.173   <none>        2181/TCP
 svc/example-headless   ClusterIP   None            <none>        2888/TCP,3888/TCP   2m
 ```
 
+### Deploy a sample Zookeeper cluster with Ephemeral storage
+
+Create a Yaml file called `zk.yaml` with the following content to install a 3-node Zookeeper cluster.
+
+```yaml
+apiVersion: "zookeeper.pravega.io/v1beta1"
+kind: "ZookeeperCluster"
+metadata:
+  name: "example"
+spec:
+  replicas: 3
+  storage:        
+    storagetype: ephemeral
+```
+
+```
+$ kubectl create -f zk.yaml
+```
+
+After a couple of minutes, all cluster members should become ready.
+
+```
+$ kubectl get zk
+
+NAME      REPLICAS   READY REPLICAS   VERSION   DESIRED VERSION   INTERNAL ENDPOINT    EXTERNAL ENDPOINT   AGE
+example   3          3                 0.2.7     0.2.7             10.100.200.18:2181   N/A                 94s
+```
+>Note: User should only provide either persistence or ephemeral in the spec, if none of the values is specified default is persistence
+
 ### Deploy a sample Zookeeper cluster with Istio
 Create a Yaml file called `zk-with-istio.yaml` with the following content to install a 3-node Zookeeper cluster.
 

charts/zookeeper/README.md

@@ -59,6 +59,9 @@ The following table lists the configurable parameters of the Zookeeper chart and
 | `config.tickTime` | Length of a single tick which is the basic time unit used by Zookeeper (measured in milliseconds) | `2000` |
 | `config.syncLimit` | Amount of time (in ticks) to allow followers to sync with Zookeeper | `2` |
 | `config.quorumListenOnAllIPs` | Whether Zookeeper server will listen for connections from its peers on all available IP addresses | `false` |
-| `persistence.reclaimPolicy` | Reclaim policy for persistent volumes | `Delete` |
-| `persistence.storageClassName` | Storage class for persistent volumes | `standard` |
-| `persistence.volumeSize` | Size of the volume requested for persistent volumes | `20Gi` |
+| `storage.type` | Type of storage that can be used it can take either ephemeral or persistence as value | `persistence` |
+| `storage.persistence.reclaimPolicy` | Reclaim policy for persistent volumes | `Delete` |
+| `storage.persistence.storageClassName` | Storage class for persistent volumes | `standard` |
+| `storage.persistence.volumeSize` | Size of the volume requested for persistent volumes | `20Gi` |
+| `storage.ephemeral.emptydirvolumesource.medium` |  What type of storage medium should back the directory. | `""` |
+| `storage.ephemeral.emptydirvolumesource.sizeLimit` | Total amount of local storage required for the EmptyDir volume. | `` |

charts/zookeeper/templates/zookeeper.yaml

@@ -43,10 +43,23 @@ spec:
     syncLimit: {{ .Values.config.syncLimit }}
     quorumListenOnAllIPs: {{ .Values.config.quorumListenOnAllIPs }}
   {{- end }}
-  persistence:
-    reclaimPolicy: {{ .Values.persistence.reclaimPolicy }}
-    spec:
-      storageClassName: {{ .Values.persistence.storageClassName }}
-      resources:
-        requests:
-          storage: {{ .Values.persistence.volumeSize }}
+  storage:
+    storageType: {{ .Values.storage.type }}
+    {{- if eq .Values.storage.type "ephemeral" }}
+    ephemeral:
+      {{- if .Values.storage.ephemeral.emptydirvolumesource }}
+      emptydirvolumesource:
+        medium: {{ .Values.storage.ephemeral.emptydirvolumesource.medium }}
+        {{- if .Values.storage.ephemeral.emptydirvolumesource.sizeLimit }}
+        sizeLimit: {{ .Values.storage.ephemeral.emptydirvolumesource.sizeLimit }}
+        {{- end }}
+       {{- end }}
+    {{- else }}
+    persistence:
+      reclaimPolicy: {{ .Values.storage.persistence.reclaimPolicy }}
+      spec:
+        storageClassName: {{ .Values.storage.persistence.storageClassName }}
+        resources:
+          requests:
+            storage: {{ .Values.storage.persistence.volumeSize }}
+    {{- end }}

charts/zookeeper/values.yaml

@@ -26,12 +26,23 @@ config: {}
   # syncLimit: 2
   # quorumListenOnAllIPs: false
 
-persistence:
-  storageClassName: standard
-  ## specifying reclaim policy for PersistentVolumes
-  ## accepted values - Delete / Retain
-  reclaimPolicy: Delete
-  volumeSize: 20Gi
+storage:
+    ## configure the storage type
+    ## accepted values : persistence/ephemeral
+    ## default option is
+    type: persistence
+    persistence:
+      storageClassName: standard
+      ## specifying reclaim policy for PersistentVolumes
+      ## accepted values - Delete / Retain
+      reclaimPolicy: Delete
+      volumeSize: 20Gi
+    ephemeral:
+      emptydirvolumesource:
+        ## specifying Medium for emptydirvolumesource
+        ## accepted values - ""/Memory
+        #medium: ""
+        #sizeLimit: 20Gi
 
 hooks:
   image:

go.mod

@@ -3,14 +3,18 @@ module github.com/pravega/zookeeper-operator
 go 1.13
 
 require (
+	4d63.com/gochecknoglobals v0.0.0-20190306162314-7c3491d2b6ec // indirect
+	4d63.com/gochecknoinits v0.0.0-20200108094044-eb73b47b9fc4 // indirect
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
 	github.com/go-logr/logr v0.1.0
+	github.com/gordonklaus/ineffassign v0.0.0-20200309095847-7953dde2c7bf // indirect
 	github.com/onsi/ginkgo v1.12.0
 	github.com/onsi/gomega v1.9.0
 	github.com/opennota/check v0.0.0-20180911053232-0c771f5545ff // indirect
 	github.com/operator-framework/operator-sdk v0.17.0
 	github.com/pkg/errors v0.9.1
 	github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da
+	github.com/securego/gosec v0.0.0-20200401082031-e946c8c39989 // indirect
 	k8s.io/api v0.17.5
 	k8s.io/apimachinery v0.17.5
 	k8s.io/client-go v12.0.0+incompatible

go.sum

@@ -1,3 +1,7 @@
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+4d63.com/gochecknoglobals v0.0.0-20190306162314-7c3491d2b6ec/go.mod h1:Sk40JNJmh0koZukOjJfaBNLZazbZthFfHnLHIcZNS6A=
+4d63.com/gochecknoinits v0.0.0-20200108094044-eb73b47b9fc4 h1:bf5qocEKjrY58JO2GwywfLsb1199lIVs7qHkiplwHy0=
+4d63.com/gochecknoinits v0.0.0-20200108094044-eb73b47b9fc4/go.mod h1:4o1i5aXtIF5tJFt3UD1knCVmWOXg7fLYdHVu6jeNcnM=
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 bou.ke/monkey v1.0.1/go.mod h1:FgHuK96Rv2Nlf+0u1OOVDpCMdsWyOFmeeketDHE7LIg=
@@ -461,6 +465,8 @@ github.com/gophercloud/gophercloud v0.6.0 h1:Xb2lcqZtml1XjgYZxbeayEemq7ASbeTp09m
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+github.com/gordonklaus/ineffassign v0.0.0-20200309095847-7953dde2c7bf h1:vc7Dmrk4JwS0ZPS6WZvWlwDflgDTA26jItmbSj83nug=
+github.com/gordonklaus/ineffassign v0.0.0-20200309095847-7953dde2c7bf/go.mod h1:cuNKsD1zp2v6XfE/orVX2QE1LC+i254ceGcVeDT3pTU=
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@@ -567,6 +573,7 @@ github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0/go.mod h1:1NbS8ALr
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+github.com/kisielk/errcheck v1.2.0 h1:reN85Pxc5larApoH1keMBiu2GWtPqXQ1nc9gx+jOU+E=
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@@ -583,13 +590,15 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
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@@ -681,6 +690,7 @@ github.com/mohae/deepcopy v0.0.0-20170603005431-491d3605edfb/go.mod h1:TaXosZuwd
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+github.com/mozilla/tls-observatory v0.0.0-20200317151703-4fa42e1c2dee/go.mod h1:SrKMQvPiws7F7iqYp8/TX+IhxCYhzr6N/1yb8cwHsGk=
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@@ -695,6 +705,8 @@ github.com/naoina/go-stringutil v0.1.0/go.mod h1:XJ2SJL9jCtBh+P9q5btrd/Ylo8XwT/h
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@@ -850,6 +862,8 @@ github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdh
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@@ -948,6 +962,7 @@ github.com/xlab/handysort v0.0.0-20150421192137-fb3537ed64a1/go.mod h1:QcJo0QPSf
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@@ -1029,6 +1044,7 @@ golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -1203,9 +1219,12 @@ golang.org/x/tools v0.0.0-20191111182352-50fa39b762bc/go.mod h1:b+2E5dAYhXwXZwtn
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+golang.org/x/tools v0.0.0-20200331202046-9d5940d49312 h1:2PHG+Ia3gK1K2kjxZnSylizb//eyaMG8gDFbOG7wLV8=
+golang.org/x/tools v0.0.0-20200331202046-9d5940d49312/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
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pkg/apis/zookeeper/v1beta1/deepcopy_test.go

@@ -69,7 +69,7 @@ var _ = Describe("ZookeeperCluster DeepCopy", func() {
 			z2.Spec.Ports[0].ContainerPort = p.ContainerPort
 			z1.SetAnnotations(m)
 			z2.Spec.Pod.Annotations = z1.Spec.Pod.Annotations
-			z2.Spec.Persistence = z1.Spec.Persistence.DeepCopy()
+			z2.Spec.Storage.Persistence = z1.Spec.Storage.Persistence.DeepCopy()
 			z1.Spec.Pod.DeepCopyInto(&z2.Spec.Pod)
 			z1.Status.Members.Ready = []string{"zk-0", "zk-1"}
 			z1.Status.Members.Unready = []string{"zk-2"}