# Write simple HTTP Get code

• Code

  from fastapi import FastAPI
  import uvicorn
  import os
  
  app = FastAPI()
  
  @app.get("/hello")
  async def hello(message='test'):
  
      configMapMessage=os.getenv('helloMessage')
      return {configMapMessage:message}
  
  if __name__ == "__main__":
  
      uvicorn.run(app, host="127.0.0.1", port=8080)

# Create Dockerfile

• Requirements.txt

  • File

  fastapi[all]==0.109.0
  uvicorn[standard]==0.27.0

  • Simple Dockerfile

  # For more information, please refer to https://aka.ms/vscode-docker-python
  FROM python:3-slim
  
  EXPOSE 8080
  
  # Keeps Python from generating .pyc files in the container
  ENV PYTHONDONTWRITEBYTECODE=1
  
  # Turns off buffering for easier container logging
  ENV PYTHONUNBUFFERED=1
  
  ENV helloMessage="defualt from docker file"
  
  # Install pip requirements
  COPY requirements.txt .
  RUN python -m pip install -r requirements.txt
  
  WORKDIR /app
  COPY . /app
  
  # Creates a non-root user with an explicit UID and adds permission to access the /app folder
  # For more info, please refer to https://aka.ms/vscode-docker-python-configure-containers
  RUN adduser -u 5678 --disabled-password --gecos "" appuser && chown -R appuser /app
  USER appuser
  
  # During debugging, this entry point will be overridden. For more information, please refer to https://aka.ms/vscode-docker-python-debug
  CMD ["uvicorn","main:app","--host" ,"0.0.0.0", "--port","8080" ]
  

  # Build the code and dockerfile into docker (Image)

  • Command line
    • docker build -t http_get:v1 .

# Ymal files

• Deployment

  apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: http-get-simple-deployment-configmap
  spec:
    replicas: 3
    selector:
      matchLabels:
        app: http-get-configmap
    template:
      metadata:
        labels:
          app: http-get-configmap
      spec:
        containers:
          - name: http-get-python-get-configmap
            image: http_get_configmap:v1
            ports:
              - containerPort: 8080
            env:
              - name: helloMessage
                valueFrom:
                  configMapKeyRef:
                    name: config-http-get
                    key: helloMessage

• Service

  apiVersion: v1
  kind: Service
  metadata:
    name: http-get-simple-service-configmap
  spec:
    selector:
      app: http-get-configmap
    type: LoadBalancer
    ports:
      - port: 8080
        targetPort: 8080
        protocol: TCP
  

• Service

  apiVersion: v1
  kind: Service
  metadata:
    name: http-get-simple-service-configmap
  spec:
    selector:
      app: http-get-configmap
    type: LoadBalancer
    ports:
      - port: 8080
        targetPort: 8080
        protocol: TCP
  

• Config map

  apiVersion: v1
  kind: ConfigMap
  metadata:
    name: config-http-get
  data:
    helloMessage : hellllllo from config map 

# Verify

• Command

  • kubectl get service -o wide

  • Expected result

    

• Web Browser

  • http://localhost:8080/hello

  • Expected result

    

Resources

• https://hub.docker.com/layers/sariabuqoura/kube_http_get_configmap/v1/images/sha256-7386db9d631062b958f9f6640b19e4bf2b5ac639d9a97499ceaa69daefc15e7d?context=repo