k8s nutshell

README.md

Kubernetes in a Nutshell

0. minikube start && minikube addons enable ingress
1. eval $(minikube docker-env)
2. docker build -t app .
3. echo -e "add to /etc/hosts:\n$(minikube ip) app.example.com\n"
4. kubectl apply -f app.yaml
5. curl http://app.example.com

app.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-deployment
  labels:
    app: app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: app
        image: app
        imagePullPolicy: Never # we need to build it (see step #2)
        ports:
          - containerPort: 8000
---
kind: Service
apiVersion: v1
metadata:
  name: app
spec:
  selector:
    app: app
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8000
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: app
spec:
  rules:
  - host: app.example.com
    http:
      paths:
      - backend:
          serviceName: app
          servicePort: 80

Dockerfile

FROM debian:stable

RUN apt-get update \
  && apt-get -y --no-install-recommends install \
      python \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*

EXPOSE "8000"
ENTRYPOINT ["python", "-m", "SimpleHTTPServer"]