# Kubernetes Deployment Configuration
# Deployment manages a set of identical pods and ensures desired state

apiVersion: apps/v1
kind: Deployment
metadata:
  # Name of the deployment
  name: ${CONTAINER_IMAGE_NAME}
  # Namespace where deployment will be created
  namespace: ${KUBERNETES_NAMESPACE}
  labels:
    app: ${CONTAINER_IMAGE_NAME}
spec:
  # Number of pod replicas to run
  replicas: 2
  
  # Label selector to identify pods managed by this deployment
  selector:
    matchLabels:
      app: ${CONTAINER_IMAGE_NAME}
  
  # Pod template definition
  template:
    metadata:
      labels:
        app: ${CONTAINER_IMAGE_NAME}
    spec:
      # Secret to pull images from private registry
      imagePullSecrets:
        - name: regcred
      
      # Container specification
      containers:
        - name: ${CONTAINER_IMAGE_NAME}
          # Docker image to use
          image: ${FULL_IMAGE_NAME}
          # Always pull the latest version of the image
          imagePullPolicy: Always
          
          # Container port that the app listens on
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
          
          # Health check to know when container is ready to serve traffic
          readinessProbe:
            httpGet:
              path: /
              port: http
            initialDelaySeconds: 5
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          
          # Health check to know when to restart container
          livenessProbe:
            httpGet:
              path: /
              port: http
            initialDelaySeconds: 15
            periodSeconds: 20
            timeoutSeconds: 5
            failureThreshold: 3
          
          # Resource limits and requests
          resources:
            # Minimum resources guaranteed to container
            requests:
              memory: "64Mi"
              cpu: "100m"
            # Maximum resources container can use
            limits:
              memory: "128Mi"
              cpu: "200m"