Add Node Affinity

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: add-node-affinity
 5  annotations:
 6    policies.kyverno.io/title: Add Node Affinity
 7    policies.kyverno.io/category: Other
 8    policies.kyverno.io/severity: medium
 9    policies.kyverno.io/subject: Deployment
10    kyverno.io/kyverno-version: 1.5.1
11    kyverno.io/kubernetes-version: "1.21"
12    policies.kyverno.io/description: >-
13      Node affinity, similar to node selection, is a way to specify which node(s) on which Pods will be scheduled
14      but based on more complex conditions. This policy will add node affinity to a Deployment and if one already
15      exists an expression will be added to it.      
16spec:
17  background: false
18  rules:
19  - name: add-node-affinity-deployment
20    match:
21      resources:
22        kinds:
23        - Deployment
24    mutate:
25      patchesJson6902: |-
26        - path: "/spec/template/spec/affinity/nodeAffinity/requiredDuringSchedulingIgnoredDuringExecution/nodeSelectorTerms/-1/matchExpressions/-1"
27          op: add
28          value: {"key":"zone_weight","operator":"Lt","values":["400"]}