apiVersion: v1
kind: Pod
metadata:
  name: pod-affinity
spec:
  containers:
    - name: nginx
      image: nginx
      ports:
        - containerPort: 80
  priorityClassName: hign-priority
  affinity:
    podAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        - labelSelector:
            matchExpressions:
              - key: tier
                operator: In
                values:
                  - frontend
          topologyKey: kubernetes.io/hostname