From 54cc039184d2bad9919f055f54806fff62df096b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rados=C5=82aw=20Piliszek?= <rpiliszek@7bulls.com>
Date: Tue, 23 May 2023 19:30:22 +0200
Subject: [PATCH] Add an example Helm chart

Change-Id: I052b48b039e0f7b9413d6f90e2a9ffd85a17bbe9
---
 .../nebulous-component-template/.helmignore   | 23 ++++++
 charts/nebulous-component-template/Chart.yaml | 24 ++++++
 .../templates/NOTES.txt                       | 22 +++++
 .../templates/_helpers.tpl                    | 62 ++++++++++++++
 .../templates/deployment.yaml                 | 61 ++++++++++++++
 .../templates/hpa.yaml                        | 28 +++++++
 .../templates/ingress.yaml                    | 61 ++++++++++++++
 .../templates/service.yaml                    | 15 ++++
 .../templates/serviceaccount.yaml             | 12 +++
 .../nebulous-component-template/values.yaml   | 82 +++++++++++++++++++
 zuul.d/jobs.yaml                              |  8 ++
 zuul.d/project.yaml                           |  2 +
 12 files changed, 400 insertions(+)
 create mode 100644 charts/nebulous-component-template/.helmignore
 create mode 100644 charts/nebulous-component-template/Chart.yaml
 create mode 100644 charts/nebulous-component-template/templates/NOTES.txt
 create mode 100644 charts/nebulous-component-template/templates/_helpers.tpl
 create mode 100644 charts/nebulous-component-template/templates/deployment.yaml
 create mode 100644 charts/nebulous-component-template/templates/hpa.yaml
 create mode 100644 charts/nebulous-component-template/templates/ingress.yaml
 create mode 100644 charts/nebulous-component-template/templates/service.yaml
 create mode 100644 charts/nebulous-component-template/templates/serviceaccount.yaml
 create mode 100644 charts/nebulous-component-template/values.yaml

diff --git a/charts/nebulous-component-template/.helmignore b/charts/nebulous-component-template/.helmignore
new file mode 100644
index 0000000..0e8a0eb
--- /dev/null
+++ b/charts/nebulous-component-template/.helmignore
@@ -0,0 +1,23 @@
+# 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
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/
diff --git a/charts/nebulous-component-template/Chart.yaml b/charts/nebulous-component-template/Chart.yaml
new file mode 100644
index 0000000..892aadd
--- /dev/null
+++ b/charts/nebulous-component-template/Chart.yaml
@@ -0,0 +1,24 @@
+apiVersion: v2
+name: nebulous-component-template
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "latest"
diff --git a/charts/nebulous-component-template/templates/NOTES.txt b/charts/nebulous-component-template/templates/NOTES.txt
new file mode 100644
index 0000000..7afd25d
--- /dev/null
+++ b/charts/nebulous-component-template/templates/NOTES.txt
@@ -0,0 +1,22 @@
+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 "nebulous-component-template.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "nebulous-component-template.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "nebulous-component-template.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 "nebulous-component-template.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 }}
diff --git a/charts/nebulous-component-template/templates/_helpers.tpl b/charts/nebulous-component-template/templates/_helpers.tpl
new file mode 100644
index 0000000..4c10ab0
--- /dev/null
+++ b/charts/nebulous-component-template/templates/_helpers.tpl
@@ -0,0 +1,62 @@
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "nebulous-component-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 "nebulous-component-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 "nebulous-component-template.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "nebulous-component-template.labels" -}}
+helm.sh/chart: {{ include "nebulous-component-template.chart" . }}
+{{ include "nebulous-component-template.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "nebulous-component-template.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "nebulous-component-template.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "nebulous-component-template.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "nebulous-component-template.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
diff --git a/charts/nebulous-component-template/templates/deployment.yaml b/charts/nebulous-component-template/templates/deployment.yaml
new file mode 100644
index 0000000..30613c7
--- /dev/null
+++ b/charts/nebulous-component-template/templates/deployment.yaml
@@ -0,0 +1,61 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "nebulous-component-template.fullname" . }}
+  labels:
+    {{- include "nebulous-component-template.labels" . | nindent 4 }}
+spec:
+  {{- if not .Values.autoscaling.enabled }}
+  replicas: {{ .Values.replicaCount }}
+  {{- end }}
+  selector:
+    matchLabels:
+      {{- include "nebulous-component-template.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      {{- with .Values.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      labels:
+        {{- include "nebulous-component-template.selectorLabels" . | nindent 8 }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      serviceAccountName: {{ include "nebulous-component-template.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: 8080
+              protocol: TCP
+          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 }}
diff --git a/charts/nebulous-component-template/templates/hpa.yaml b/charts/nebulous-component-template/templates/hpa.yaml
new file mode 100644
index 0000000..926c199
--- /dev/null
+++ b/charts/nebulous-component-template/templates/hpa.yaml
@@ -0,0 +1,28 @@
+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "nebulous-component-template.fullname" . }}
+  labels:
+    {{- include "nebulous-component-template.labels" . | nindent 4 }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "nebulous-component-template.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+    {{- if .Values.autoscaling.targetCPUUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: cpu
+        targetAverageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+    {{- end }}
+    {{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: memory
+        targetAverageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    {{- end }}
+{{- end }}
diff --git a/charts/nebulous-component-template/templates/ingress.yaml b/charts/nebulous-component-template/templates/ingress.yaml
new file mode 100644
index 0000000..09110c3
--- /dev/null
+++ b/charts/nebulous-component-template/templates/ingress.yaml
@@ -0,0 +1,61 @@
+{{- if .Values.ingress.enabled -}}
+{{- $fullName := include "nebulous-component-template.fullname" . -}}
+{{- $svcPort := .Values.service.port -}}
+{{- if and .Values.ingress.className (not (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion)) }}
+  {{- if not (hasKey .Values.ingress.annotations "kubernetes.io/ingress.class") }}
+  {{- $_ := set .Values.ingress.annotations "kubernetes.io/ingress.class" .Values.ingress.className}}
+  {{- end }}
+{{- end }}
+{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1
+{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1beta1
+{{- else -}}
+apiVersion: extensions/v1beta1
+{{- end }}
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- include "nebulous-component-template.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  {{- if and .Values.ingress.className (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- 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 }}
+            {{- if and .pathType (semverCompare ">=1.18-0" $.Capabilities.KubeVersion.GitVersion) }}
+            pathType: {{ .pathType }}
+            {{- end }}
+            backend:
+              {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
+              service:
+                name: {{ $fullName }}
+                port:
+                  number: {{ $svcPort }}
+              {{- else }}
+              serviceName: {{ $fullName }}
+              servicePort: {{ $svcPort }}
+              {{- end }}
+          {{- end }}
+    {{- end }}
+{{- end }}
diff --git a/charts/nebulous-component-template/templates/service.yaml b/charts/nebulous-component-template/templates/service.yaml
new file mode 100644
index 0000000..59e8451
--- /dev/null
+++ b/charts/nebulous-component-template/templates/service.yaml
@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "nebulous-component-template.fullname" . }}
+  labels:
+    {{- include "nebulous-component-template.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    {{- include "nebulous-component-template.selectorLabels" . | nindent 4 }}
diff --git a/charts/nebulous-component-template/templates/serviceaccount.yaml b/charts/nebulous-component-template/templates/serviceaccount.yaml
new file mode 100644
index 0000000..ca26c7b
--- /dev/null
+++ b/charts/nebulous-component-template/templates/serviceaccount.yaml
@@ -0,0 +1,12 @@
+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ include "nebulous-component-template.serviceAccountName" . }}
+  labels:
+    {{- include "nebulous-component-template.labels" . | nindent 4 }}
+  {{- with .Values.serviceAccount.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}
diff --git a/charts/nebulous-component-template/values.yaml b/charts/nebulous-component-template/values.yaml
new file mode 100644
index 0000000..abdb714
--- /dev/null
+++ b/charts/nebulous-component-template/values.yaml
@@ -0,0 +1,82 @@
+# Default values for nebulous-component-template.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+replicaCount: 1
+
+image:
+  repository: "quay.io/nebulous/component-template-java-spring-boot-demo"
+  pullPolicy: IfNotPresent
+  # Overrides the image tag whose default is the chart appVersion.
+  tag: ""
+
+imagePullSecrets: []
+nameOverride: ""
+fullnameOverride: ""
+
+serviceAccount:
+  # Specifies whether a service account should be created
+  create: true
+  # Annotations to add to the service account
+  annotations: {}
+  # The name of the service account to use.
+  # If not set and create is true, a name is generated using the fullname template
+  name: ""
+
+podAnnotations: {}
+
+podSecurityContext: {}
+  # fsGroup: 2000
+
+securityContext: {}
+  # capabilities:
+  #   drop:
+  #   - ALL
+  # readOnlyRootFilesystem: true
+  # runAsNonRoot: true
+  # runAsUser: 1000
+
+service:
+  type: ClusterIP
+  port: 80
+
+ingress:
+  enabled: false
+  className: ""
+  annotations: {}
+    # kubernetes.io/ingress.class: nginx
+    # kubernetes.io/tls-acme: "true"
+  hosts:
+    - host: chart-example.local
+      paths:
+        - path: /
+          pathType: ImplementationSpecific
+  tls: []
+  #  - secretName: chart-example-tls
+  #    hosts:
+  #      - chart-example.local
+
+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
+
+autoscaling:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 100
+  targetCPUUtilizationPercentage: 80
+  # targetMemoryUtilizationPercentage: 80
+
+nodeSelector: {}
+
+tolerations: []
+
+affinity: {}
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index bf035d4..35ba27d 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -32,3 +32,11 @@
     vars:
       dockerfiles:
         - java-spring-boot-demo/Dockerfile
+
+- job:
+    name: nebulous-component-template-apply-helm-charts
+    parent: nebulous-apply-helm-charts
+    description: Deploy a Kubernetes cluster and apply charts.
+    vars:
+      helm_charts:
+        nebulous-component-template: ./charts/nebulous-component-template
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index 4e023d0..a8d8c8e 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -1,11 +1,13 @@
 - project:
     check:
       jobs:
+        - nebulous-component-template-apply-helm-charts
         - nebulous-component-template-build-container-images
         - nebulous-component-template-hadolint
         - nox-linters
     gate:
       jobs:
+        - nebulous-component-template-apply-helm-charts
         - nebulous-component-template-upload-container-images
         - nebulous-component-template-hadolint
         - nox-linters