# Sample yaml for an nginx app deployment that:
#   Replicates to 3 pods.
#   Spreads the pods across worker nodes with preferred pod anti-affinity.
#   Sets resource requests and limits for the container.
#   Creates a readiness probe so that traffic is only sent to a pod that is considered ready.
# Apply the deployment by running 'kubectl apply -f filepath/nginx_preferredAntiAffinity.yaml'.
# Check the state of your deployment by running 'kubectl get pods'.
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: app
                  operator: In
                  values:
                  - nginx
              topologyKey: kubernetes.io/hostname
      containers:
      - name: nginx
        image: nginx
        readinessProbe:
          httpGet:
            path: /ready
            port: 8080
          periodSeconds: 2
          initialDelaySeconds: 0
          failureThreshold: 3
          successThreshold: 1
        ports:
        - containerPort: 8080
        resources:
          requests:
            memory: "64Mi"
            cpu: "250m"
          limits:
            memory: "128Mi"
            cpu: "500m"
---
apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 8080
  selector:
    app: nginx
  type: NodePort