Install

brew install helm

Create simple app

Create app.py files:

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}

requirements.txt:

fastapi==0.62.0

and Dockerfile:

FROM python:3.8.6
EXPOSE 8008
ADD requirements.txt .
RUN pip install -r requirements.txt
ADD app.py .
CMD uvicorn app:app --reload --port 8080 --host 0.0.0.0

Run docker:

docker build -t barteks/simple-helm .

Change barteks into your Docker Hub username.

Then you can check your docker with:

docker run -p 8080:8080 --rm -it barteks/simple-helm

Now push the docker to Docker Hub

docker push barteks/simple-helm

Run it in Kubernetes

Let’s test it in minkube. Run minikube:

minikube start

kubectl create deployment simple-helm --image=barteks/simple-helm

kubectl expose deployment simple-helm --type=LoadBalancer --port=8080

minikube service simple-helm

With yaml

Create deployment.yaml with

apiVersion: apps/v1
kind: Deployment
metadata:
  name: simple-helm
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: simple-helm
  template:
    metadata:
      name: simple-helm
      labels:
        app.kubernetes.io/name: simple-helm
    spec:
      containers:
      - image: barteks/simple-helm
        name: simple-helm
        ports:
        - name: http
          containerPort: 8080
          protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
  name: simple-helm
spec:
  selector:
    app.kubernetes.io/name: simple-helm
  ports:
    - protocol: TCP
      port: 8080

Then

kubectl apply -f deployment.yaml

Clean

kubectl delete service simple-helm
kubectl delete deployment simple-helm

Helm

helm create simple-helm-chart

image
  repository: barteks/simple-helm
  pullPolicy: IfNotPresent
  tag: latest

service:
  name: simple-helm
  type: LoadBalancer
  externalPort: 8080
  internalPort: 8008
  port: 8080

Also in templates/deployment.yaml correct the port of the container:

  containerPort: 8080

You can check your helm files with (run it from simple-helm-chart directory)

helm lint

Now you are ready to package (run it from root directory):

helm package simple-helm-chart

You should have simple-helm-chart-0.1.0.tgz file.

Run helm in Kubernetes

In k8s cluster run:

helm install simple-helm simple-helm-chart-0.1.0.tgz

Then, in minikube:

minikube service simple-helm-simple-helm-chart

Get status:

helm status simple-helm

Uninstall

helm uninstall simple-helm

Updated: 2020-12-13