Infrastructure as Code: Managing Configs with YAML

version: "3.9"

services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=postgres://user:pass@db:5432/myapp
      - REDIS_URL=redis://cache:6379
    depends_on:
      - db
      - cache
    restart: unless-stopped

  db:
    image: postgres:16-alpine
    volumes:
      - pgdata:/var/lib/postgresql/data
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: pass
      POSTGRES_DB: myapp

  cache:
    image: redis:7-alpine
    command: redis-server --maxmemory 256mb --maxmemory-policy allkeys-lru

volumes:
  pgdata:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: monitoring-agent
  labels:
    app: xitoring-agent
spec:
  replicas: 3
  selector:
    matchLabels:
      app: xitoring-agent
  template:
    metadata:
      labels:
        app: xitoring-agent
    spec:
      containers:
        - name: agent
          image: xitoring/agent:latest
          resources:
            requests:
              memory: "64Mi"
              cpu: "50m"
            limits:
              memory: "128Mi"
              cpu: "100m"
          env:
            - name: API_KEY
              valueFrom:
                secretKeyRef:
                  name: xitoring-secrets
                  key: api-key

name: Deploy

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Run tests
        run: |
          npm ci
          npm test

      - name: Build and push Docker image
        run: |
          docker build -t myapp:latest .
          docker push myapp:latest

      - name: Notify monitoring
        run: |
          curl -X POST https://api.xitoring.com/deployments