feat: Add basic app chart

charts/app/.helmignore

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+# 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
+.vscode/

charts/app/Chart.yaml

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+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: app
+version: 0.0.1

charts/app/README.md

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+app
+===
+A Helm chart for Kubernetes
+
+Current chart version is `0.0.1`
+
+
+
+
+
+## Chart Values
+
+| Key | Type | Default | Description |
+|-----|------|---------|-------------|
+| affinity | object | `{}` | Kubernetes affinity resource. |
+| fullnameOverride | string | `""` |  |
+| image.pullPolicy | string | `"IfNotPresent"` |  |
+| image.repository | string | `"nginx"` |  |
+| image.tag | string | `"latest"` |  |
+| imagePullSecrets | list | `[]` |  |
+| ingress.annotations | object | `{}` | Configures annotations for the ingress. |
+| ingress.enabled | bool | `false` | Enable ingress resource. |
+| ingress.hosts[0].host | string | `"chart-example.local"` | Host name for routing traffic. |
+| ingress.hosts[0].paths | list | `["/"]` | Array of routable paths. |
+| ingress.tls | list | `[]` | Kubernetes ingress tls resource. |
+| nameOverride | string | `""` |  |
+| nodeSelector | object | `{}` | Kubernetes node selectors for Deployment resources. |
+| replicaCount | int | `1` | Replica count for deployments. |
+| resources | object | `{}` | Kubernetes resources for Deployment resources. |
+| service.enabled | bool | `true` | Enable service resource. |
+| service.internalPort | int | `80` | Deployment internal port. |
+| service.port | int | `80` | Kubernetes service port. |
+| service.type | string | `"ClusterIP"` | Kubernetes service type. |
+| tolerations | list | `[]` | Kubernetes tolerations for Deployment resources. |

charts/app/templates/NOTES.txt

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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 }}://{{ $host.host }}{{ . }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "app.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "app.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "app.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
+  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 "app.name" . }},app.kubernetes.io/instance={{ .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 8080:80
+{{- end }}

charts/app/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "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 "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 "app.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Common labels
+*/}}
+{{- define "app.labels" -}}
+app.kubernetes.io/name: {{ include "app.name" . }}
+helm.sh/chart: {{ include "app.chart" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+app.kubernetes.io/version: {{ .Values.version | quote }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end -}}

charts/app/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "app.fullname" . }}
+  labels:
+{{ include "app.labels" . | indent 4 }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "app.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: {{ include "app.name" . }}
+        app.kubernetes.io/instance: {{ .Release.Name }}
+    spec:
+    {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          # TODO: Fill out environment variables.
+          ports:
+            - name: http
+              containerPort: {{ .Values.service.internalPort }}
+              protocol: TCP
+          # TODO: Configurable probes.
+          livenessProbe:
+            httpGet:
+              path: /
+              port: http
+          readinessProbe:
+            httpGet:
+              path: /
+              port: http
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+    {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}
+    {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+    {{- end }}

charts/app/templates/ingress.yaml

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+{{- if .Values.ingress.enabled -}}
+{{- $fullName := include "app.fullname" . -}}
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+{{ include "app.labels" . | indent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+{{- 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: {{ . }}
+            backend:
+              serviceName: {{ $fullName }}
+              servicePort: http
+        {{- end }}
+  {{- end }}
+{{- end }}

charts/app/templates/service.yaml

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+{{- if .Values.service.enabled -}}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "app.fullname" . }}
+  labels:
+{{ include "app.labels" . | indent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    app.kubernetes.io/name: {{ include "app.name" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}

charts/app/values.yaml

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+# replicaCount -- Replica count for deployments.
+replicaCount: 1
+
+image:
+  repository: nginx
+  tag: latest
+  pullPolicy: IfNotPresent
+
+imagePullSecrets: []
+nameOverride: ""
+fullnameOverride: ""
+
+service:
+  # service.enabled -- Enable service resource.
+  enabled: true
+  # service.type -- Kubernetes service type.
+  type: ClusterIP
+  # service.port -- Kubernetes service port.
+  port: 80
+  # service.internalPort -- Deployment internal port.
+  internalPort: 80
+
+ingress:
+  # ingress.enabled -- Enable ingress resource.
+  enabled: false
+  # ingress.annotations -- Configures annotations for the ingress.
+  annotations: {}
+    # kubernetes.io/ingress.class: nginx
+    # kubernetes.io/tls-acme: "true"
+  hosts:
+    # ingress.hosts[0].host -- Host name for routing traffic.
+    - host: chart-example.local
+      # ingress.hosts[0].paths -- Array of routable paths.
+      paths: ["/"]
+
+  # ingress.tls -- Kubernetes ingress tls resource.
+  tls: []
+  #  - secretName: chart-example-tls
+  #    hosts:
+  #      - chart-example.local
+
+# resources -- Kubernetes resources for Deployment resources.
+resources: {}
+  # We usually recommend not to specify default resources and to leave this as a conscious
+  # choice for the user. This also increases chances charts run on environments with little
+  # resources, such as Minikube. If you do want to specify resources, uncomment the following
+  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  # limits:
+  #   cpu: 100m
+  #   memory: 128Mi
+  # requests:
+  #   cpu: 100m
+  #   memory: 128Mi
+
+# nodeSelector -- Kubernetes node selectors for Deployment resources.
+nodeSelector: {}
+
+# tolerations -- Kubernetes tolerations for Deployment resources.
+tolerations: []
+
+# affinity -- Kubernetes affinity resource.
+affinity: {}