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apiVersion: apps/v1
kind: Deployment
metadata:
  name: user-authentication-service
  namespace: production
  labels:
    app: user-auth
    tier: backend
    version: v1.2.0
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app: user-auth
  template:
    metadata:
      labels:
        app: user-auth
        tier: backend
        version: v1.2.0
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "8080"
        prometheus.io/path: "/metrics"
    spec:
      serviceAccountName: user-auth-sa
      securityContext:
        runAsNonRoot: true
        runAsUser: 1000
        fsGroup: 1000
      containers:
      - name: auth-api
        image: myregistry.io/user-auth-service:v1.2.0
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
          name: http
          protocol: TCP
        env:
        - name: DATABASE_HOST
          valueFrom:
            configMapKeyRef:
              name: auth-config
              key: db.host
        - name: DATABASE_PASSWORD
          valueFrom:
            secretKeyRef:
              name: auth-secrets
              key: db.password
        - name: JWT_SECRET
          valueFrom:
            secretKeyRef:
              name: auth-secrets
              key: jwt.secret
        - name: LOG_LEVEL
          value: "info"
        resources:
          requests:
            memory: "256Mi"
            cpu: "200m"
          limits:
            memory: "512Mi"
            cpu: "500m"
        livenessProbe:
          httpGet:
            path: /health/live
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 10
          timeoutSeconds: 5
          failureThreshold: 3
        readinessProbe:
          httpGet:
            path: /health/ready
            port: 8080
          initialDelaySeconds: 10
          periodSeconds: 5
          timeoutSeconds: 3
          failureThreshold: 2
        securityContext:
          allowPrivilegeEscalation: false
          readOnlyRootFilesystem: true
          capabilities:
            drop:
            - ALL
        volumeMounts:
        - name: tmp
          mountPath: /tmp
        - name: cache
          mountPath: /app/cache
      volumes:
      - name: tmp
        emptyDir: {}
      - name: cache
        emptyDir: {}
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: app
                  operator: In
                  values:
                  - user-auth
              topologyKey: kubernetes.io/hostname
---
apiVersion: v1
kind: Service
metadata:
  name: user-auth-service
  namespace: production
  labels:
    app: user-auth
spec:
  type: ClusterIP
  selector:
    app: user-auth
  ports:
  - port: 80
    targetPort: 8080
    protocol: TCP
    name: http
  sessionAffinity: None
---
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: user-auth-hpa
  namespace: production
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: user-authentication-service
  minReplicas: 3
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 70
  - type: Resource
    resource:
      name: memory
      target:
        type: Utilization
        averageUtilization: 80
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
      - type: Percent
        value: 50
        periodSeconds: 60
    scaleUp:
      stabilizationWindowSeconds: 0
      policies:
      - type: Percent
        value: 100
        periodSeconds: 30
      - type: Pods
        value: 2
        periodSeconds: 30
      selectPolicy: Max