Bakdata Kafka Streams Helm Repository

charts/README.md

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+# Kafka Streams Bakdata Helm Repository
+
+Collection of commonly used charts associated with bakdata kafka streaming applications.
+
+## Install
+
+```
+helm repo add bakdata-common https://raw.githubusercontent.com/bakdata/common-kafka-streams/<branch_name>/charts/
+helm install bakdata-common/<chart_to_install>
+```
+
+## Development
+
+You can add new charts in a separate folder or update existing ones. To update the helm repository please run:
+
+```
+helm repo index . --merge <your-chart>
+```

charts/index.yaml

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+apiVersion: v1
+entries:
+  streams-app:
+  - apiVersion: v1
+    created: 2019-04-16T11:19:08.655324+02:00
+    description: A helm chart for deploying a kafka streams application based on the
+      bakdata KafkaStreamsApplication template.
+    digest: d4b1ffad8da8fc2150ff52ce84d9e7ebca7a1ec742cff07b3885b7b47d9e1d00
+    name: streams-app
+    urls:
+    - ./streams-app/streams-app-0.1.0.tgz
+    version: 0.1.0
+generated: 2019-04-16T11:19:08.654593+02:00

charts/streams-app/Chart.yaml

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+apiVersion: v1
+name: streams-app
+description: A helm chart for deploying a kafka streams application based on the bakdata KafkaStreamsApplication template.
+version: 0.1.0

charts/streams-app/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "streams-app.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 "streams-app.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 "streams-app.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

charts/streams-app/templates/deployment.yaml

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+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: {{ template "streams-app.fullname" . }}
+  labels:
+    app: {{ template "streams-app.name" . }}
+    chart: {{ template "streams-app.chart" . }}
+    release: {{ .Release.Name }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app: {{ template "streams-app.name" . }}
+      release: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ template "streams-app.name" . }}
+        release: {{ .Release.Name }}
+    spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+          - labelSelector:
+              matchExpressions:
+              - key: app
+                operator: In
+                values:
+                - {{ template "streams-app.name" . }}
+            topologyKey: "kubernetes.io/hostname"
+      containers:
+      - name: {{ template "streams-app.name" . }}-container
+        image: "{{ .Values.image }}:{{ .Values.imageTag }}"
+        imagePullPolicy: "{{ .Values.imagePullPolicy }}"
+        env:
+          - name: ENV_PREFIX
+            value: {{ .Values.configurationEnvPrefix }}
+          {{- range $key, $value := .Values.env }}
+          - name: {{ $key | quote }}
+            value: {{ $value | quote }}
+          {{- end }}

charts/streams-app/values.yaml

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+nameOverride: bakdataStreamsApp
+
+replicaCount: 1
+
+image: streamsApp
+imageTag: latest
+imagePullPolicy: Always
+
+configurationEnvPrefix: "APP_"
+
+env:
+  APP_INPUT_TOPIC: "test"
+  APP_OUTPUT_TOPIC: "test"
+  APP_BROKERS: "test:9092"
+  APP_ROOT_TAG: "root"
+  APP_OUTPUT_SCHEMA: "/test/schema"
+  APP_SCHEMA_REGISTRY_URL: "url:1234"
+