YAMLdeployment.yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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  name: myapp
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  namespace: production
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  labels:
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    app: myapp
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    version: "1.0"
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spec:
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  replicas: 3
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  selector:
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    matchLabels:
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      app: myapp
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  strategy:
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    type: RollingUpdate
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    rollingUpdate:
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      maxSurge: 1
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      maxUnavailable: 0  # Zero-downtime updates
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  template:
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    metadata:
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      labels:
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        app: myapp
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        version: "1.0"
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    spec:
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      topologySpreadConstraints:
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        - maxSkew: 1
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          topologyKey: kubernetes.io/hostname
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          whenUnsatisfiable: DoNotSchedule
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          labelSelector:
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            matchLabels:
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              app: myapp
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      terminationGracePeriodSeconds: 30
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      containers:
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        - name: myapp
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          image: ghcr.io/myorg/myapp:1.0.0
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          ports:
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            - containerPort: 8080
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          resources:
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            requests:
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              cpu: 100m
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              memory: 128Mi
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            limits:
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              cpu: 500m
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              memory: 512Mi
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          livenessProbe:
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            httpGet:
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              path: /healthz
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              port: 8080
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            initialDelaySeconds: 15
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            periodSeconds: 10
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            failureThreshold: 3
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          readinessProbe:
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            httpGet:
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              path: /ready
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              port: 8080
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            initialDelaySeconds: 5
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            periodSeconds: 5
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            failureThreshold: 3
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          env:
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            - name: APP_ENV
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              value: production
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          securityContext:
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            runAsNonRoot: true
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            runAsUser: 10001
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            allowPrivilegeEscalation: false
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            readOnlyRootFilesystem: true
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---
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apiVersion: policy/v1
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kind: PodDisruptionBudget
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metadata:
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  name: myapp-pdb
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  namespace: production
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spec:
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  minAvailable: 2
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  selector:
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    matchLabels:
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      app: myapp
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---
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apiVersion: autoscaling/v2
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kind: HorizontalPodAutoscaler
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metadata:
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  name: myapp-hpa
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  namespace: production
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spec:
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  scaleTargetRef:
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    apiVersion: apps/v1
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    kind: Deployment
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    name: myapp
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  minReplicas: 3
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  maxReplicas: 20
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  metrics:
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    - type: Resource
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      resource:
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        name: cpu
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        target:
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          type: Utilization
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          averageUtilization: 60
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    - type: Resource
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      resource:
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        name: memory
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        target:
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          type: Utilization
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          averageUtilization: 70
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