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feat(k8s): 🚀 Add Helm chart
Signed-off-by: Prashant Shahi <me@prashantshahi.dev>
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‎helm/Chart.yaml‎

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name: todo-flaskapp
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description: Helm Chart for ToDo FlaskApp with MongoDB
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version: 0.0.1
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apiVersion: v1
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keywords:
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- flaskapp
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sources:
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- https://github.com/prashant-shahi/ToDo-List-using-Flask-and-MongoDB
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- https://prashantshahi.dev
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home: https://github.com/prashant-shahi/ToDo-List-using-Flask-and-MongoDB

‎helm/README.md‎

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# Helm Chart for ToDo-FlaskApp
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This directory contains Helm chart for the ToDo-FlaskApp.

‎helm/templates/_helper.tpl‎

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{{/* vim: set filetype=mustache: */}}
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{{/*
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Expand the name of the chart.
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*/}}
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{{- define "flaskapp.name" -}}
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{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
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{{- end -}}
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{{/*
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Return the proper flaskapp image name
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*/}}
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{{- define "flaskapp.image" -}}
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{{- $registryName := .Values.flaskapp.image.registry -}}
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{{- $repositoryName := .Values.flaskapp.image.repository -}}
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{{- $tag := .Values.flaskapp.image.tag | toString -}}
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{{- if $registryName -}}
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{{- printf "%s/%s:%s" $registryName $repositoryName $tag -}}
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{{- else -}}
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{{- printf "%s:%s" $repositoryName $tag -}}
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{{- end -}}
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{{- end -}}
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{{/*
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Return the proper mongo image name
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*/}}
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{{- define "mongo.image" -}}
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{{- $registryName := .Values.mongo.image.registry -}}
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{{- $repositoryName := .Values.mongo.image.repository -}}
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{{- $tag := .Values.mongo.image.tag | toString -}}
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{{- if $registryName -}}
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{{- printf "%s/%s:%s" $registryName $repositoryName $tag -}}
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{{- else -}}
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{{- printf "%s:%s" $repositoryName $tag -}}
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{{- end -}}
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{{- end -}}

‎helm/templates/flaskapp-persistentvolumeclaim.yaml‎

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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.flaskapp.name }}
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name: {{ .Values.flaskapp.name }}
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spec:
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accessModes:
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- ReadWriteOnce
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resources:
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requests:
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storage: 100Mi
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status: {}

‎helm/templates/mongo-deployment.yaml‎

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.mongo.name }}
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name: {{ .Values.mongo.name }}
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spec:
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replicas: 1
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selector:
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matchLabels:
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app.kubernetes.io/component: {{ .Values.mongo.name }}
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strategy:
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type: Recreate
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template:
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.mongo.name }}
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spec:
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containers:
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- image: {{ template "mongo.image" . }}
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name: {{ .Values.mongo.name }}
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ports:
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- containerPort: {{ .Values.mongo.service.port }}
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resources: {}
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volumeMounts:
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- mountPath: /data/db/
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name: {{ .Values.flaskapp.name }}
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restartPolicy: Always
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volumes:
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- name: {{ .Values.flaskapp.name }}
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persistentVolumeClaim:
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claimName: {{ .Values.flaskapp.name }}
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status: {}

‎helm/templates/mongo-service.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.mongo.name }}
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name: {{ .Values.mongo.name }}
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spec:
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ports:
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- name: "http"
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port: {{ .Values.mongo.service.port }}
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targetPort: {{ .Values.mongo.service.port }}
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protocol: TCP
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selector:
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app.kubernetes.io/component: {{ .Values.mongo.name }}
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type: {{ .Values.mongo.service.type }}
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status:
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loadBalancer: {}

‎helm/templates/todo-flaskapp-deployment.yaml‎

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.flaskapp.name }}
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name: {{ .Values.flaskapp.name }}
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spec:
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replicas: 1
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selector:
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matchLabels:
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app.kubernetes.io/component: {{ .Values.flaskapp.name }}
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strategy: {}
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template:
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.flaskapp.name }}
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spec:
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initContainers:
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- name: {{ .Values.flaskapp.name }}-init
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image: {{ template "mongo.image" . }}
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imagePullPolicy: IfNotPresent
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env:
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- name: MONGO_HOST
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value: {{ .Values.mongo.name }}
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- name: MONGO_PORT
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value: {{ .Values.mongo.service.port | quote }}
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command:
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- sh
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- -c
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- until mongo --eval 'db.runCommand("ping").ok' ${MONGO_HOST}:${MONGO_PORT}/test --quiet; do echo -e "waiting for MongoDB"; sleep 5; done; echo -e "MongoDB ready, starting ToDo-FlaskApp now";
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containers:
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- name: {{ .Values.flaskapp.name }}
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image: {{ template "flaskapp.image" . }}
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env:
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- name: FLASK_ENV
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value: {{ .Values.flaskapp.env }}
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- name: MONGO_HOST
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value: {{ .Values.mongo.name }}
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- name: MONGO_PORT
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value: {{ .Values.mongo.service.port | quote }}
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- name: PORT
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value: {{ .Values.flaskapp.service.port | quote }}
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ports:
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- containerPort: {{ .Values.flaskapp.service.port }}
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resources: {}
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restartPolicy: Always
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status: {}

‎helm/templates/todo-flaskapp-service.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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labels:
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app.kubernetes.io/component: {{ .Values.flaskapp.name }}
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name: todo-flaskapp
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spec:
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ports:
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- name: "http"
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port: {{ .Values.flaskapp.service.port }}
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targetPort: {{ .Values.flaskapp.service.port }}
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protocol: TCP
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selector:
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app.kubernetes.io/component: {{ .Values.flaskapp.name }}
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type: {{ .Values.flaskapp.service.type }}
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status:
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loadBalancer: {}

‎helm/values.yaml‎

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nameoverride: ""
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mongo:
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name: mongo
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image:
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registry: docker.io
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repository: mvertes/alpine-mongo
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tag: latest
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imagePullPolicy: IfNotPresent
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service:
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type: ClusterIP
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port: 27017
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flaskapp:
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name: todo-flaskapp
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env: production
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image:
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registry: docker.io
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repository: coolboi567/todo-flaskapp
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tag: latest
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imagePullPolicy: Always
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service:
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type: ClusterIP
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port: 5000

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