microservices helm chart with pod_affinity

charts/microservices/Chart.yaml

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+apiVersion: v2
+name: microservice
+description: Basic helm chart for deploying microservices on kubernetes with best practices
+type: application
+version: 0.1.0
+appVersion: "0.1.2"
+maintainers:
+  - name: Ashwani Singh
+    email: [email protected]
+  - name: Khushi Malhotra

charts/microservices/README.md.gotmpl

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+{{ template "chart.header" . }}
+{{ template "chart.description" . }}
+
+{{ template "chart.versionBadge" . }}{{ template "chart.typeBadge" . }}{{ template "chart.appVersionBadge" . }}
+
+{{ template "chart.maintainersSection" . }}
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```console
+$ helm install my-release microservice/
+```
+
+{{/* {{ template "chart.requirementsSection" . }} */}}
+
+{{ template "chart.valuesSection" . }}
+
+> **_NOTE:_**  Please find the sample helm values yaml in example repository.
+
+{{/* {{ template "helm-docs.versionFooter" . }} */}}

charts/microservices/examples/config.conf

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+name=opstree
+address=opstreesolution

charts/microservices/examples/deploy-nginx.yaml

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+global:
+  namespace: "default"
+#  replicaCount: 5 
+  fullnameOverride: "webapp"
+
+deployment:
+  image:
+    name: nginx
+    tag: latest
+    pullPolicy: IfNotPresent
+  livenessProbe: 
+    httpGet:
+      path: "/"
+      port: http
+  readinessProbe: 
+    httpGet:
+      path: "/"
+      port: http
+  resources:
+    requests:
+      memory: 100Mi
+      cpu: 100m
+    limits:
+      memory: 500Mi
+      cpu: 500m
+  volumes:
+    enabled: true
+    configMaps:
+      - name: index
+        mountPath: /usr/share/nginx/html
+        data:
+          index.html: |
+            Hello! Opstree
+

charts/microservices/templates/README.md

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+# microservice
+
+Basic helm chart for deploying microservices on kubernetes with best practices
+
+![Version: 0.1.3](https://img.shields.io/badge/Version-0.1.3-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 0.1.2](https://img.shields.io/badge/AppVersion-0.1.2-informational?style=flat-square)
+
+## Maintainers
+
+| Name | Email | Url |
+| ---- | ------ | --- |
+| Ashwani Singh | <[email protected]> |  |
+| Khushi Malhotra |  |  |
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```console
+helm install my-microservice -f ./values.yaml -f/examples/deploy-nginx.yaml
+```
+
+## Values
+
+| Key | Type | Default | Description |
+|-----|------|---------|-------------|
+| deployment | object | `{"affinity":{"podAntiAffinity"},"annotations":{},"environment":{},"image":{"name":"","pullPolicy":"IfNotPresent","tag":""},"livenessProbe":{"failureThreshold":5,"initialDelaySeconds":250,"periodSeconds":10,"successThreshold":1,"timeoutSeconds":5},"nodeSelector":{},"readinessProbe":{"failureThreshold":5,"initialDelaySeconds":30,"periodSeconds":10,"successThreshold":1,"timeoutSeconds":5},"resources":{},"tolerations":[],"volumeMounts":[],"volumes":{"configMaps":null,"enabled":true,"pvc":{"accessModes":["ReadWriteOnce"],"class":"default","enabled":false,"existing_claim":false,"mountPath":"/pv","name":"pvc","size":"1G"}}}` | Object that configures Deployment instance |
+| deployment.image | object | `{"name":"","pullPolicy":"IfNotPresent","tag":""}` | Override default container image format |
+| global | object | `{"environment":{},"fullnameOverride":"","imagePullSecrets":[],"nameOverride":"","namespace":"default","replicaCount":1}` | global variables   |
+| hpa.enabled | bool | `true` |  |
+| hpa.maxReplicas | int | `6` |  |
+| hpa.minReplicas | int | `5` |  |
+| hpa.targetCPU | int | `80` |  |
+| hpa.targetMemory | int | `80` |  |
+| kubeVersion | string | `""` |  |
+| service.annotations | object | `{}` |  |
+| service.specs[0].name | string | `"http"` |  |
+| service.specs[0].port | int | `80` |  |
+| service.type | string | `"ClusterIP"` |  |
+| serviceAccount.annotations | object | `{}` |  |
+| serviceAccount.automount | bool | `true` |  |
+| serviceAccount.create | bool | `false` |  |
+| serviceAccount.name | string | `""` |  |
+
+> **_NOTE:_**  Please find the sample helm values yaml in example repository.

charts/microservices/templates/_capabiities.tpl

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+{{/* vim: set filetype=mustache: */}}
+
+{{/*
+Return the target Kubernetes version
+*/}}
+{{- define "microservice.capabilities.kubeVersion" -}}
+{{- default (default .Capabilities.KubeVersion.Version .Values.kubeVersion) ((.Values.global).kubeVersion) -}}
+{{- end -}}
+
+{{/*
+Return the appropriate apiVersion for Horizontal Pod Autoscaler.
+*/}}
+{{- define "microservice.capabilities.hpa.apiVersion" -}}
+{{- $kubeVersion := include "microservice.capabilities.kubeVersion" .context -}}
+{{- if and (not (empty $kubeVersion)) (semverCompare "<1.23-0" $kubeVersion) -}}
+{{- if .beta2 -}}
+{{- print "autoscaling/v2beta2" -}}
+{{- else -}}
+{{- print "autoscaling/v2beta1" -}}
+{{- end -}}
+{{- else -}}
+{{- print "autoscaling/v2" -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Return the appropriate apiVersion for deployment.
+*/}}
+{{- define "microservice.capabilities.deployment.apiVersion" -}}
+{{- $kubeVersion := include "microservice.capabilities.kubeVersion" . -}}
+{{- if and (not (empty $kubeVersion)) (semverCompare "<1.14-0" $kubeVersion) -}}
+{{- print "extensions/v1beta1" -}}
+{{- else -}}
+{{- print "apps/v1" -}}
+{{- end -}}
+{{- end -}}

charts/microservices/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+
+{{/*
+Create  a defautl fully qualified app name
+It will use the release name to give the app name
+*/}}
+
+{{- define "microservice.name" -}}
+{{- default .Chart.Name .Values.global.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 "microservice.fullname" -}}
+{{- if .Values.global.fullnameOverride -}}
+{{- .Values.global.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default .Chart.Name .Values.global.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Common labels
+*/}}
+{{- define "microservice.labels" -}}
+app: {{ include "microservice.fullname" . }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "microservice.selectorLabels" -}}
+app: {{ include "microservice.fullname" . }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "microservice.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "microservice.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

charts/microservices/templates/configmap.yaml

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+#ConfigMap mounted as volumes
+{{- if .Values.deployment.volumes.configMaps }}
+{{- if .Values.deployment.volumes.enabled }}
+{{ $header := .Values.deployment.volumes.configFileCommonHeader | default "" }}
+{{ $root := . }}
+{{ range $cm := .Values.deployment.volumes.configMaps}}
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "microservice.fullname" $root }}-{{ $cm.name }}-cm
+  namespace: {{ $root.Values.global.namespace | quote }}
+data:
+  {{- if $cm.data }}
+  {{- range $filename, $content := $cm.data }}
+  # property-like keys; each key maps to a simple value
+  {{ $filename }}: |-
+{{ $content | toString | indent 4}}
+  {{- end }}
+  {{- end }}
+  {{- if $cm.files }}
+  {{- range $file := $cm.files }}
+  {{ $file.destination }}: |
+{{ $header | toString | indent 4 }}
+    {{ $root.Files.Get "$file.source" }}
+  {{- end}}
+  {{- end }}
+{{- end }}
+{{- end }}
+{{- end }}

charts/microservices/templates/deployment.yaml

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+{{ $root := . }}
+---
+apiVersion: {{ include "microservice.capabilities.deployment.apiVersion" . }}
+kind: Deployment
+metadata:
+  name: {{ include "microservice.fullname" . }}-app
+  namespace: {{ .Values.global.namespace | quote }}
+  {{- if .Values.annotations }}
+  annotations:
+  {{- range $key, $value := .Values.annotations }}
+    {{ $key }}: {{ $value }}
+  {{- end }}
+  {{- end }}
+  labels:
+    {{- include "microservice.labels" . | nindent 4 }}
+spec:
+  replicas: {{ .Values.global.replicaCount }}
+  selector:
+    matchLabels:
+      {{- include "microservice.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "microservice.selectorLabels" . | nindent 8 }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      serviceAccountName: {{ include "microservice.serviceAccountName" . }}
+      containers:
+        - name: {{ include "microservice.fullname" . }}
+          image: "{{ .Values.deployment.image.name }}:{{ .Values.deployment.image.tag }}"
+          imagePullPolicy: {{ .Values.deployment.image.pullPolicy }}
+          {{- if .Values.deployment.command }}
+          command: {{ .Values.deployment.command }}
+          {{- end }}
+          {{- if .Values.deployment.args }}
+          args: {{ .Values.deployment.args }}
+          {{- end }}
+          ports:
+            {{- range .Values.service.specs }}
+            - name: {{ .name }}
+              containerPort: {{ .targetPort | default .port }}
+              protocol: {{ .protocol | default "TCP" }}
+            {{- end }}
+          {{- if (merge .Values.global.environment .Values.deployment.environment) }}
+          env:
+          {{- range $name, $value := merge .Values.global.environment .Values.deployment.environment }}
+          - name: {{ $name | quote }}
+            value: {{ $value | quote }}
+          {{- end }}
+          {{- end }}
+          {{- if .Values.deployment.livenessProbe }}
+          livenessProbe:
+            {{- with .Values.deployment.livenessProbe }}
+            httpGet:
+              path: {{ .httpGet.path | quote }}
+              port: {{ .httpGet.port | quote }}
+            initialDelaySeconds: {{ .initialDelaySeconds }}
+            periodSeconds: {{ .periodSeconds }}
+            timeoutSeconds: {{ .timeoutSeconds }}
+            successThreshold: {{ .successThreshold }}
+            failureThreshold: {{ .failureThreshold }}
+            {{- end }}
+          {{- end }}
+          {{- if .Values.deployment.readinessProbe }}
+          readinessProbe:
+            {{- with .Values.deployment.readinessProbe }}
+            httpGet:
+              path: {{ .httpGet.path | quote }}
+              port: {{ .httpGet.port | quote }}
+            initialDelaySeconds: {{ .initialDelaySeconds }}
+            periodSeconds: {{ .periodSeconds }}
+            timeoutSeconds: {{ .timeoutSeconds }}
+            successThreshold: {{ .successThreshold }}
+            failureThreshold: {{ .failureThreshold }}
+            {{- end }}
+          {{- end }}
+          resources:
+            {{- toYaml .Values.deployment.resources | nindent 12 }}
+          {{- if .Values.deployment.volumes.enabled }}
+          volumeMounts:
+            {{- range $conf := .Values.deployment.volumes.configMaps }}
+            - mountPath: {{ $conf.mountPath }}
+              name: {{ include "microservice.fullname" $root }}-{{ $conf.name }}-cm
+            {{- end }}
+            {{- if .Values.deployment.volumes.pvc.enabled }}
+            - mountPath: {{ .Values.volumes.pvc.mountPath }}
+              name: {{ .Values.volumes.pvc.existing_claim | default .Values.volumes.pvc.name }}-volume
+            {{- end }}
+          {{- end }}
+      {{- if .Values.deployment.volumes.enabled }}
+      volumes:
+        {{- range $conf := .Values.deployment.volumes.configMaps }}
+        - name: {{ include "microservice.fullname" $root }}-{{ $conf.name }}-cm
+          configMap:
+            name: {{ include "microservice.fullname" $root }}-{{ $conf.name }}-cm
+        {{- end }}
+        {{- if .Values.deployment.volumes.pvc.enabled }}
+        - name: {{ .Values.deployment.volumes.pvc.existing_claim | default .Values.deployment.volumes.pvc.name }}-volume
+          persistentVolumeClaim:
+            claimName: {{ .Values.deployment.volumes.pvc.existing_claim | default .Values.deployment.volumes.pvc.name }}
+        {{- end }}
+      {{- end }}
+      {{- with .Values.deployment.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.deployment.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.deployment.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.deployment.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- range . }}
+        - maxSkew: {{ .maxSkew }}
+          topologyKey: {{ .topologyKey | quote }}  # Ensure this is set and not empty
+          whenUnsatisfiable: {{ .whenUnsatisfiable }}
+          labelSelector:
+            matchLabels:
+              app: {{ include "microservice.fullname" $root }}
+          minDomains: {{ .minDomains }}
+        {{- end }}
+      {{- end }}