block1.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
 name: nginx-deployment-demo
spec:
 selector:
   matchLabels:
     app: nginx
     env: demo
 replicas: 3
 strategy:
   rollingUpdate:
     maxUnavailable: 0
 template:
   metadata:
     labels:
       app: nginx
       env: demo
   spec:
     affinity:
       nodeAffinity:
         requiredDuringSchedulingIgnoredDuringExecution:
           nodeSelectorTerms:
           - matchExpressions:
             - key: failure-domain.beta.kubernetes.io/zone
               operator: In
               values:
               - us-central1-a
               - us-central1-b
               - us-central1-c
       podAntiAffinity:
         preferredDuringSchedulingIgnoredDuringExecution:
         - weight: 100
           podAffinityTerm:
             labelSelector:
               matchExpressions:
               - key: app
                 operator: In
                 values:
                 - nginx
             topologyKey: kubernetes.io/hostname
     containers:
     - name: nginx
       image: nginx:1.15.3
       ports:
       - containerPort: 80