强制

kind: Deployment
apiVersion: apps/v1
metadata:
  name: springboot-web-app1
  labels:
    k8s-app: springboot-web-app1
spec:
  replicas: 5  
  template:    
    spec:      
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: k8s-app
                    operator: In
                    values:
                      - springboot-web-app1
              topologyKey: kubernetes.io/hostname

尽量

kind: Deployment
apiVersion: apps/v1
metadata:
  name: springboot-web-app1
  labels:
    k8s-app: springboot-web-app1
spec:
  replicas: 5  
  template:    
    spec:      
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchExpressions:
                    - key: k8s-app
                      operator: In
                      values:
                        - springboot-web-app1
                topologyKey: kubernetes.io/hostname