adding redis-exporter chart (#2743)

* adding redis-exporter chart

* use {{ .Release.Name }} for resource naming

* adding annotations for prometheus scrapper

* Revert "use {{ .Release.Name }} for resource naming"

This reverts commit 4c0388f030.

* use .Release.Name for fullname

* updated prerequisites and api version

* matchLabels required for apps/v1beta2

* added suggested style fixes

* adding release label

* renamed to prometheus redis exporter

* moved to stable

* use a named port

* upgraded to v0.16.0

stable/prometheus-redis-exporter/.helmignore

@@ -0,0 +1,21 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj

stable/prometheus-redis-exporter/Chart.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+appVersion: 0.16.0
+description: Prometheus exporter for Redis metrics
+name: prometheus-redis-exporter
+version: 0.1.0
+home: https://github.com/oliver006/redis_exporter
+sources:
+  - https://github.com/oliver006/redis_exporter
+keywords:
+  - prometheus
+  - redis
+maintainers:
+  - name: acondrat
+    email: arcadie.condrat@gmail.com

stable/prometheus-redis-exporter/README.md

@@ -0,0 +1,68 @@
+# prometheus-redis-exporter
+
+[redis_exporter](https://github.com/oliver006/redis_exporter) is a Prometheus exporter for Redis metrics.
+
+## TL;DR;
+
+```bash
+$ helm install stable/prometheus-redis-exporter
+```
+
+## Introduction
+
+This chart bootstraps a [redis_exporter](https://github.com/oliver006/redis_exporter) deployment on a [Kubernetes](http://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.
+
+## Prerequisites
+
+- Kubernetes 1.8+ with Beta APIs enabled
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```bash
+$ helm install --name my-release stable/prometheus-redis-exporter
+```
+
+The command deploys prometheus-redis-exporter on the Kubernetes cluster in the default configuration.
+
+## 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 and their default values.
+
+| Parameter              | Description                                         | Default                   |
+| ---------------------- | --------------------------------------------------- | ------------------------- |
+| `replicaCount`         | desired number of prometheus-redis-exporter pods    | `1`                       |
+| `image.repository`     | prometheus-redis-exporter image repository          | `oliver006/redis_exporter`|
+| `image.tag`            | prometheus-redis-exporter image tag                 | `v0.16.0`                 |
+| `image.pullPolicy`     | image pull policy                                   | `IfNotPresent`            |
+| `resources`            | cpu/memory resource requests/limits                 | {}                        |
+| `service.type`         | desired service type                                | `ClusterIP`               |
+| `service.port`         | service external port                               | `9121`                    |
+| `redisAddress`         | address of one or more redis nodes, comma separated | `redis://myredis:6379`    |
+
+For more information please refer to the [redis_exporter](https://github.com/oliver006/redis_exporter) documentation.
+
+Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,
+
+```bash
+$ helm install --name my-release \
+  --set "redisAddress=redis://myredis:6379" \
+    stable/prometheus-redis-exporter
+```
+
+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/prometheus-redis-exporter
+```

stable/prometheus-redis-exporter/templates/NOTES.txt

@@ -0,0 +1,15 @@
+1. Get the Redis Exporter URL by running these commands:
+{{- if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ template "prometheus-redis-exporter.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get svc -w {{ template "prometheus-redis-exporter.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ template "prometheus-redis-exporter.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
+  echo http://$SERVICE_IP:{{ .Values.service.externalPort }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app={{ template "prometheus-redis-exporter.name" . }},release={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl port-forward $POD_NAME 8080:{{ .Values.service.internalPort }}
+{{- end }}

stable/prometheus-redis-exporter/templates/_helpers.tpl

@@ -0,0 +1,32 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "prometheus-redis-exporter.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "prometheus-redis-exporter.fullname" -}}
+{{- if .Values.fullnameOverride -}}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "prometheus-redis-exporter.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

stable/prometheus-redis-exporter/templates/deployment.yaml

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+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: {{ template "prometheus-redis-exporter.fullname" . }}
+  labels:
+    app: {{ template "prometheus-redis-exporter.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app: {{ template "prometheus-redis-exporter.name" . }}
+      release: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ template "prometheus-redis-exporter.name" . }}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - name: exporter-port
+              containerPort: 9121
+          env:
+            - name: REDIS_ADDR
+              value: {{ .Values.redisAddress }}
+          livenessProbe:
+            httpGet:
+              path: /
+              port: exporter-port
+          readinessProbe:
+            httpGet:
+              path: /
+              port: exporter-port
+          resources:
+{{ toYaml .Values.resources | indent 12 }}
+    {{- if .Values.nodeSelector }}
+      nodeSelector:
+{{ toYaml .Values.nodeSelector | indent 8 }}
+    {{- end }}

stable/prometheus-redis-exporter/templates/service.yaml

@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ template "prometheus-redis-exporter.fullname" . }}
+  labels:
+    app: {{ template "prometheus-redis-exporter.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+  annotations:
+{{ toYaml .Values.service.annotations | indent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: exporter-port
+      protocol: TCP
+  selector:
+    app: {{ template "prometheus-redis-exporter.name" . }}
+    release: {{ .Release.Name }}

stable/prometheus-redis-exporter/values.yaml

@@ -0,0 +1,11 @@
+replicaCount: 1
+image:
+  repository: oliver006/redis_exporter
+  tag: v0.16.0
+  pullPolicy: IfNotPresent
+service:
+  type: ClusterIP
+  port: 9121
+  annotations: {}
+resources: {}
+redisAddress: redis://myredis:6379