# Cronjob chart example

templates/cronjob.yaml

{{- $appName := include "general-template.name" . -}}
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: {{ include "general-template.name" . }}
spec:
  schedule: "{{ .Values.schedule.cron }}"
  concurrencyPolicy: "{{ .Values.schedule.concurrencyPolicy }}"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
            name: {{ $appName }}-{{ .Release.Namespace }}
            env:
            {{- include "helpers.list-env-variables" . | indent 12 }}

          restartPolicy: OnFailure
          {{- if .Values.volume.enabled }}
          volumes:
            - name: {{ $appName }}-{{ .Release.Namespace }}
              persistentVolumeClaim:
                claimName: {{ $appName }}-{{ .Release.Namespace }}
          {{- end }}

templates/_helpers.tpl

{{/*
Expand the name of the chart.
*/}}
{{- define "general-template.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 "general-template.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 "general-template.chart" -}}
{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
{{- end }}

{{/*
Common labels
*/}}
{{- define "general-template.labels" -}}
helm.sh/chart: {{ include "general-template.chart" . }}
{{ include "general-template.selectorLabels" . }}
{{- if .Chart.AppVersion }}
app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
{{- end }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end }}

{{/*
Selector labels
*/}}
{{- define "general-template.selectorLabels" -}}
app.kubernetes.io/name: {{ include "general-template.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}

{{/*
Create the name of the service account to use
*/}}
{{- define "general-template.serviceAccountName" -}}
{{- if .Values.serviceAccount.create }}
{{- default (include "general-template.fullname" .) .Values.serviceAccount.name }}
{{- else }}
{{- default "default" .Values.serviceAccount.name }}
{{- end }}
{{- end }}

{{/* 
Create helper for environemnt variaableh 
Usage:
{{- include "helpers.list-env-variables" . | indent 12 }}
*/}}
{{- define "helpers.list-env-variables"}}
{{- range $key, $val := .Values.envVar }}
- name: {{ $val.name | quote }}
  value: {{ $val.value | quote}}
{{- end}}
{{- end }}

{{/*
Renders a value that contains template.
Usage:
{{ include "common.tplvalues.render" ( dict "value" .Values.path.to.the.Value "context" $) }}
*/}}
{{- define "common.tplvalues.render" -}}
    {{- if typeIs "string" .value }}
        {{- tpl .value .context }}
    {{- else }}
        {{- tpl (.value | toYaml) .context }}
    {{- end }}
{{- end -}}

templates/PersistentVolume.yaml

{{- $appName := include "general-template.name" . -}}
{{- if .Values.volume.enabled }}
apiVersion: v1
kind: PersistentVolume
metadata:
  name: {{ $appName }}-{{ .Release.Namespace }}
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  #storageClassName: nfs
  nfs:
    server:  {{ .Values.volume.server }}
    path:  {{ .Values.volume.path }}
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: {{ $appName }}-{{ .Release.Namespace }}
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ''
# volumeMode: Filesystem
  volumeName: {{ $appName }}-{{ .Release.Namespace }} 
  resources:
    requests:
      storage: 5Gi
{{- end }}

templates/serviceaccount.yaml

{{- if .Values.serviceAccount.create -}}
apiVersion: v1
kind: ServiceAccount
metadata:
  name: {{ include "general-template.serviceAccountName" . }}
  labels:
    {{- include "general-template.labels" . | nindent 4 }}
  {{- with .Values.serviceAccount.annotations }}
  annotations:
    {{- toYaml . | nindent 4 }}
  {{- end }}
{{- end }}

Chart.yaml

apiVersion: v2
name: cronjob
description: A Helm chart for Kubernetes

type: application

version: 0.1.0


appVersion: "0.1.0"

values.yaml

image:
  repository: ""
  tag: ""
schedule:
  cron: "5 3 * * *"
  concurrencyPolicy: "Forbid"

volume:
  enabled: true
  mountPath: 
  server: 
  path: 

imagePullSecrets: []
nameOverride: ""
fullnameOverride: ""

serviceAccount:
  create: true
  annotations: {}
  name: ""

podAnnotations: {}

podSecurityContext: {}

securityContext: {}

service:
  type: ClusterIP
  port: 8080
  targetPort: 8080

route:
  enabled: #for openshift
  annotations: {}

ingress:
  enabled: false
  annotations: {}
  hosts:
    - host: chart-example.local
      paths:
        - path: /
          backend:
            serviceName: chart-example.local
            servicePort: 80
  tls: []

resources: {}

autoscaling:
  enabled: false
  minReplicas: 1
  maxReplicas: 100
  targetCPUUtilizationPercentage: 80

nodeSelector: {}

tolerations: []

affinity: {}

envVar:
  - name: key
    value: value
  - name: key1
    value: value1
  - name: key2
    value: value2