add Redis chart (#158)

* add Redis chart

Adds a Redis chart with the following features:
- PVC provisioning
- Default random password

* set resource limits and remove replicas key from deployment

stable/redis/.helmignore

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+.git

stable/redis/Chart.yaml

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+name: redis
+version: 0.4.0
+description: Chart for Redis
+keywords:
+- redis
+- keyvalue
+- database
+home: http://redis.io/
+sources:
+- https://github.com/bitnami/bitnami-docker-redis
+maintainers:
+- name: Bitnami
+  email: containers@bitnami.com
+engine: gotpl

stable/redis/README.md

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+# Redis
+
+[Redis](http://redis.io/) is an advanced key-value cache and store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets, sorted sets, bitmaps and hyperloglogs.
+
+## TL;DR;
+
+```bash
+$ helm install stable/redis
+```
+
+## Introduction
+
+This chart bootstraps a [Redis](https://github.com/bitnami/bitnami-docker-redis) deployment on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.
+
+## Prerequisites
+
+- Kubernetes 1.4+ with Beta APIs enabled
+- PV provisioner support in the underlying infrastructure
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```bash
+$ helm install --name my-release stable/redis
+```
+
+The command deploys Redis on the Kubernetes cluster in the default configuration. The [configuration](#configuration) section lists the parameters that can be configured during installation.
+
+> **Tip**: List all releases using `helm list`
+
+## Uninstalling the Chart
+
+To uninstall/delete the `my-release` deployment:
+
+```bash
+$ helm delete my-release
+```
+
+The command removes all the Kubernetes components associated with the chart and deletes the release.
+
+## Configuration
+
+The following tables lists the configurable parameters of the Redis chart and their default values.
+
+| Parameter                  | Description                         | Default                                                   |
+| -------------------------- | ----------------------------------- | --------------------------------------------------------- |
+| `image`                    | Redis image                         | `bitnami/redis:{VERSION}`                                 |
+| `imagePullPolicy`          | Image pull policy                   | `Always` if `imageTag` is `latest`, else `IfNotPresent`   |
+| `redisPassword`            | Redis password                      | Randomly generated                                        |
+| `persistence.enabled`      | Use a PVC to persist data           | `true`                                                    |
+| `persistence.storageClass` | Storage class of backing PVC        | `generic`                                                 |
+| `persistence.accessMode`   | Use volume as ReadOnly or ReadWrite | `ReadWriteOnce`                                           |
+| `persistence.size`         | Size of data volume                 | `8Gi`                                                     |
+| `resources`                | CPU/Memory resource requests/limits | Memory: `256Mi`, CPU: `100m`                              |
+
+The above parameters map to the env variables defined in [bitnami/redis](http://github.com/bitnami/bitnami-docker-redis). For more information please refer to the [bitnami/redis](http://github.com/bitnami/bitnami-docker-redis) image documentation.
+
+Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,
+
+```bash
+$ helm install --name my-release \
+  --set redisPassword=secretpassword \
+    stable/redis
+```
+
+The above command sets the Redis server password to `secretpassword`.
+
+Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,
+
+```bash
+$ helm install --name my-release -f values.yaml stable/redis
+```
+
+> **Tip**: You can use the default [values.yaml](values.yaml)
+
+## Persistence
+
+The [Bitnami Redis](https://github.com/bitnami/bitnami-docker-redis) image stores the Redis data and configurations at the `/bitnami/redis` path of the container.
+
+The chart mounts a [Persistent Volume](kubernetes.io/docs/user-guide/persistent-volumes/) volume at this location. The volume is created using dynamic volume provisioning.

stable/redis/templates/NOTES.txt

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+Redis can be accessed via port 3306 on the following DNS name from within your cluster:
+{{ template "fullname" . }}.{{ .Release.Namespace }}.svc.cluster.local
+
+To get your password run:
+
+    REDIS_PASSWORD=$(printf $(printf '\%o' `kubectl get secret --namespace {{ .Release.Namespace }} {{ template "fullname" . }} -o jsonpath="{.data.redis-password[*]}"`))
+
+To connect to your Redis server:
+
+1. Run a Redis pod that you can use as a client:
+
+   kubectl run {{ template "fullname" . }}-client --rm --tty -i --env REDIS_PASSWORD=$REDIS_PASSWORD --image {{ .Values.image }} -- bash
+
+2. Connect using the Redis CLI:
+
+  redis-cli -h {{ template "fullname" . }} -a $REDIS_PASSWORD

stable/redis/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 24 -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 24 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+*/}}
+{{- define "fullname" -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 24 -}}
+{{- end -}}

stable/redis/templates/deployment.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: {{ template "fullname" . }}
+  labels:
+    app: {{ template "fullname" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: "{{ .Release.Name }}"
+    heritage: "{{ .Release.Service }}"
+spec:
+  template:
+    metadata:
+      labels:
+        app: {{ template "fullname" . }}
+    spec:
+      containers:
+      - name: {{ template "fullname" . }}
+        image: "{{ .Values.image }}"
+        imagePullPolicy: {{ default "" .Values.imagePullPolicy | quote }}
+        env:
+        - name: REDIS_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: {{ template "fullname" . }}
+              key: redis-password
+        ports:
+        - name: redis
+          containerPort: 6379
+        livenessProbe:
+          exec:
+            command:
+            - redis-cli
+            - ping
+          initialDelaySeconds: 30
+          timeoutSeconds: 5
+        readinessProbe:
+          exec:
+            command:
+            - redis-cli
+            - ping
+          initialDelaySeconds: 5
+          timeoutSeconds: 1
+        resources:
+{{ toYaml .Values.resources | indent 10 }}
+        volumeMounts:
+        - name: redis-data
+          mountPath: /bitnami/redis
+      volumes:
+      - name: redis-data
+      {{- if .Values.persistence.enabled }}
+        persistentVolumeClaim:
+          claimName: {{ template "fullname" . }}
+      {{- else }}
+        emptyDir: {}
+      {{- end -}}

stable/redis/templates/pvc.yaml

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+{{- if .Values.persistence.enabled }}
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: {{ template "fullname" . }}
+  annotations:
+    volume.alpha.kubernetes.io/storage-class: {{ .Values.persistence.storageClass | quote }}
+spec:
+  accessModes:
+    - {{ .Values.persistence.accessMode | quote }}
+  resources:
+    requests:
+      storage: {{ .Values.persistence.size | quote }}
+{{- end }}

stable/redis/templates/secrets.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ template "fullname" . }}
+  labels:
+    app: {{ template "fullname" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: "{{ .Release.Name }}"
+    heritage: "{{ .Release.Service }}"
+type: Opaque
+data:
+  {{ if .Values.redisPassword }}
+  redis-password: {{ .Values.redisPassword | b64enc | quote }}
+  {{ else }}
+  redis-password: {{ randAlphaNum 10 | b64enc | quote }}
+  {{ end }}

stable/redis/templates/svc.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ template "fullname" . }}
+  labels:
+    app: {{ template "fullname" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: "{{ .Release.Name }}"
+    heritage: "{{ .Release.Service }}"
+spec:
+  ports:
+  - name: redis
+    port: 6379
+    targetPort: redis
+  selector:
+    app: {{ template "fullname" . }}

stable/redis/values.yaml

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+## Bitnami Redis image version
+## ref: https://hub.docker.com/r/bitnami/redis/tags/
+##
+image: bitnami/redis:3.2.4-r0
+
+## Specify a imagePullPolicy
+## 'Always' if imageTag is 'latest', else set to 'IfNotPresent'
+## ref: http://kubernetes.io/docs/user-guide/images/#pre-pulling-images
+##
+# imagePullPolicy:
+
+## Redis password
+## Defaults to a random 10-character alphanumeric string if not set
+## ref: https://github.com/bitnami/bitnami-docker-redis#setting-the-server-password-on-first-run
+##
+# redisPassword:
+
+## Enable persistence using Persistent Volume Claims
+## ref: http://kubernetes.io/docs/user-guide/persistent-volumes/
+##
+persistence:
+  enabled: true
+  storageClass: generic
+  accessMode: ReadWriteOnce
+  size: 8Gi
+
+## Configure resource requests and limits
+## ref: http://kubernetes.io/docs/user-guide/compute-resources/
+##
+resources:
+  requests:
+    memory: 256Mi
+    cpu: 100m