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example(reddit-rss): add custom recipe example: reddit-rss

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Masaki Yatsu
2025-09-07 21:48:00 +09:00
parent 87d5cc5c74
commit 6e1ae8b79b
17 changed files with 595 additions and 1 deletions
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22
custom-example/reddit-rss/chart/templates/NOTES.txt Normal file
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1. Get the application URL by running these commands:
{{- if .Values.ingress.enabled }}
{{- range $host := .Values.ingress.hosts }}
{{- range .paths }}
http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
{{- end }}
{{- end }}
{{- else if contains "NodePort" .Values.service.type }}
export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "reddit-rss.fullname" . }})
export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
echo http://$NODE_IP:$NODE_PORT
{{- else if contains "LoadBalancer" .Values.service.type }}
NOTE: It may take a few minutes for the LoadBalancer IP to be available.
You can watch its status by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "reddit-rss.fullname" . }}'
export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "reddit-rss.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
echo http://$SERVICE_IP:{{ .Values.service.port }}
{{- else if contains "ClusterIP" .Values.service.type }}
export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "reddit-rss.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
echo "Visit http://127.0.0.1:8080 to use your application"
kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
{{- end }}

62
custom-example/reddit-rss/chart/templates/_helpers.tpl Normal file
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{{/*
Expand the name of the chart.
*/}}
{{- define "reddit-rss.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 "reddit-rss.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 "reddit-rss.chart" -}}
{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
{{- end }}
{{/*
Common labels
*/}}
{{- define "reddit-rss.labels" -}}
helm.sh/chart: {{ include "reddit-rss.chart" . }}
{{ include "reddit-rss.selectorLabels" . }}
{{- if .Chart.AppVersion }}
app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
{{- end }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end }}
{{/*
Selector labels
*/}}
{{- define "reddit-rss.selectorLabels" -}}
app.kubernetes.io/name: {{ include "reddit-rss.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}
{{/*
Create the name of the service account to use
*/}}
{{- define "reddit-rss.serviceAccountName" -}}
{{- if .Values.serviceAccount.create }}
{{- default (include "reddit-rss.fullname" .) .Values.serviceAccount.name }}
{{- else }}
{{- default "default" .Values.serviceAccount.name }}
{{- end }}
{{- end }}

103
custom-example/reddit-rss/chart/templates/deployment.yaml Normal file
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apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ include "reddit-rss.fullname" . }}
labels:
{{- include "reddit-rss.labels" . | nindent 4 }}
spec:
{{- if not .Values.autoscaling.enabled }}
replicas: {{ .Values.replicaCount }}
{{- end }}
selector:
matchLabels:
{{- include "reddit-rss.selectorLabels" . | nindent 6 }}
template:
metadata:
{{- with .Values.podAnnotations }}
annotations:
{{- toYaml . | nindent 8 }}
{{- end }}
labels:
{{- include "reddit-rss.labels" . | nindent 8 }}
{{- with .Values.podLabels }}
{{- toYaml . | nindent 8 }}
{{- end }}
spec:
{{- with .Values.imagePullSecrets }}
imagePullSecrets:
{{- toYaml . | nindent 8 }}
{{- end }}
serviceAccountName: {{ include "reddit-rss.serviceAccountName" . }}
securityContext:
{{- toYaml .Values.podSecurityContext | nindent 8 }}
containers:
- name: {{ .Chart.Name }}
securityContext:
{{- toYaml .Values.securityContext | nindent 12 }}
image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
imagePullPolicy: {{ .Values.image.pullPolicy }}
ports:
- name: http
containerPort: {{ .Values.service.port }}
protocol: TCP
{{- if .Values.livenessProbe }}
livenessProbe:
{{- toYaml .Values.livenessProbe | nindent 12 }}
{{- end }}
{{- if .Values.readinessProbe }}
readinessProbe:
{{- toYaml .Values.readinessProbe | nindent 12 }}
{{- end }}
resources:
{{- toYaml .Values.resources | nindent 12 }}
{{- with .Values.volumeMounts }}
volumeMounts:
{{- toYaml . | nindent 12 }}
{{- end }}
env:
- name: OAUTH_CLIENT_ID
valueFrom:
secretKeyRef:
name: auth-config
key: OAUTH_CLIENT_ID
optional: true
- name: OAUTH_CLIENT_SECRET
valueFrom:
secretKeyRef:
name: auth-config
key: OAUTH_CLIENT_SECRET
optional: true
- name: REDDIT_USERNAME
valueFrom:
secretKeyRef:
name: auth-config
key: REDDIT_USERNAME
optional: true
- name: REDDIT_PASSWORD
valueFrom:
secretKeyRef:
name: auth-config
key: REDDIT_PASSWORD
optional: true
- name: USER_AGENT
valueFrom:
secretKeyRef:
name: auth-config
key: USER_AGENT
optional: true
{{- with .Values.volumes }}
volumes:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.nodeSelector }}
nodeSelector:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.affinity }}
affinity:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.tolerations }}
tolerations:
{{- toYaml . | nindent 8 }}
{{- end }}

32
custom-example/reddit-rss/chart/templates/hpa.yaml Normal file
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{{- if .Values.autoscaling.enabled }}
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
name: {{ include "reddit-rss.fullname" . }}
labels:
{{- include "reddit-rss.labels" . | nindent 4 }}
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: {{ include "reddit-rss.fullname" . }}
minReplicas: {{ .Values.autoscaling.minReplicas }}
maxReplicas: {{ .Values.autoscaling.maxReplicas }}
metrics:
{{- if .Values.autoscaling.targetCPUUtilizationPercentage }}
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
{{- end }}
{{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
- type: Resource
resource:
name: memory
target:
type: Utilization
averageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
{{- end }}
{{- end }}

43
custom-example/reddit-rss/chart/templates/ingress.yaml Normal file
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{{- if .Values.ingress.enabled -}}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: {{ include "reddit-rss.fullname" . }}
labels:
{{- include "reddit-rss.labels" . | nindent 4 }}
{{- with .Values.ingress.annotations }}
annotations:
{{- toYaml . | nindent 4 }}
{{- end }}
spec:
{{- with .Values.ingress.className }}
ingressClassName: {{ . }}
{{- end }}
{{- if .Values.ingress.tls }}
tls:
{{- range .Values.ingress.tls }}
- hosts:
{{- range .hosts }}
- {{ . | quote }}
{{- end }}
secretName: {{ .secretName }}
{{- end }}
{{- end }}
rules:
{{- range .Values.ingress.hosts }}
- host: {{ .host | quote }}
http:
paths:
{{- range .paths }}
- path: {{ .path }}
{{- with .pathType }}
pathType: {{ . }}
{{- end }}
backend:
service:
name: {{ include "reddit-rss.fullname" $ }}
port:
number: {{ $.Values.service.port }}
{{- end }}
{{- end }}
{{- end }}

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custom-example/reddit-rss/chart/templates/service.yaml Normal file
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apiVersion: v1
kind: Service
metadata:
name: {{ include "reddit-rss.fullname" . }}
labels:
{{- include "reddit-rss.labels" . | nindent 4 }}
spec:
type: {{ .Values.service.type }}
ports:
- port: {{ .Values.service.port }}
targetPort: http
protocol: TCP
name: http
selector:
{{- include "reddit-rss.selectorLabels" . | nindent 4 }}

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custom-example/reddit-rss/chart/templates/serviceaccount.yaml Normal file
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{{- if .Values.serviceAccount.create -}}
apiVersion: v1
kind: ServiceAccount
metadata:
name: {{ include "reddit-rss.serviceAccountName" . }}
labels:
{{- include "reddit-rss.labels" . | nindent 4 }}
{{- with .Values.serviceAccount.annotations }}
annotations:
{{- toYaml . | nindent 4 }}
{{- end }}
automountServiceAccountToken: {{ .Values.serviceAccount.automount }}
{{- end }}

15
custom-example/reddit-rss/chart/templates/tests/test-connection.yaml Normal file
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apiVersion: v1
kind: Pod
metadata:
name: "{{ include "reddit-rss.fullname" . }}-test-connection"
labels:
{{- include "reddit-rss.labels" . | nindent 4 }}
annotations:
"helm.sh/hook": test
spec:
containers:
- name: wget
image: busybox
command: ['wget']
args: ['{{ include "reddit-rss.fullname" . }}:{{ .Values.service.port }}']
restartPolicy: Never