Start a basic flask webserver on top of a kubernetes cluster in your laptop.

Requirements

• Your flask webserver (just copy it from flask website)
• Install minikube and kubectl (follow the steps on their official websites)

Create Dockerfile to wrap your webserver

FROM python:2.7-alpine
MAINTAINER alizard0

RUN mkdir -p /usr/src/ws
WORKDIR /usr/src/ws

COPY requirements.txt /usr/src/ws/
RUN pip install --no-cache-dir -r requirements.txt

COPY ws.py /usr/src/ws
EXPOSE 5000

CMD ["python", "ws.py"]

Build & Run Docker

• docker build -t ws:0.0.1 .
• docker run -dit -p 5000:5000 <your-docker-username>/ws:0.0.1
• docker push <your-docker-username>/ws:0.0.1

Note: it is highly recommended to push the image to your docker account. You can change minikube settings to use local images instead.

Init Cluster & Run container

• minikube start --vm-driver=hyperkit
• kubectl run flask --image=<your-docker-username>/ws:0.0.1 --port 5000
• kubectl expose deployment flask --type=NodePort

Using yaml file

• kubectl create -f ws-deployment.yaml
• kubectl create -f ws-service.yaml

Check pods & hit webserver

• kubectl get pod
• curl $(minikube service flask --url)

Delete services

• kubectl delete services flask
• kubectl delete deployment flask

References

• https://kubernetes.io/docs/setup/minikube/
• https://github.com/learnk8s/spring-boot-k8s-hpa