I'm getting below this issue in GKS Pod is blocking scale down because it's a non-daemonset, non-mirrored, non-pdb-assigned kube-system pod

I have read this docs :- https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/FAQ.md#how-to-set-pdbs-to-enable-ca-to-move-kube-system-pods

but still not able to understand where i need to add this line in every pods or every nodes. if pods which i need to add.

In default namespace im running my application in which pods,svc,deploy are running. So i need to add under defaults namespace of pods or kube-system namespace pods

"cluster-autoscaler.kubernetes.io/scale-down-disabled": "true" even i have add in 3 nodes like this

kubectl annotate node gke-test-default-pool-a44dbf1c-05h1 cluster-autoscaler.kubernetes.io/scale-down-disabled=true kubectl annotate node gke-test-default-pool-a44dbf1c-3j6j cluster-autoscaler.kubernetes.io/scale-down-disabled=true kubectl annotate node gke-test-default-pool-a44dbf1c-hmrf cluster-autoscaler.kubernetes.io/scale-down-disabled=true

but still the error is showing on GKE

Please tell me how to solve that error/issue in GKS from 3 days im not able to understand and solve it even i google it and ready so many website but didnt solve it.

After deploying

kubectl create poddisruptionbudget pdb --namespace=kube-system --selector k8s-app=kube-dns --max-unavailable 1
Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
poddisruptionbudget.policy/pdb created

I Got deprecated and another issue

Previous i was having 3 nodes but i have 2 nodes only now because i have edit one node remove this line "cluster-autoscaler.kubernetes.io/scale-down-disabled": "true" which i have added in it after that i didnt check whether my nodes are 3 or 2.

Later i check found only 2 nodes are running.

Its a good or bad to edit nodes in GKE or AKS

kubectl get pdb -A
NAMESPACE     NAME           MIN AVAILABLE   MAX UNAVAILABLE   ALLOWED DISRUPTIONS   AGE
kube-system   kube-dns-bbc   N/A             1                 1                     69m

Here is yaml file

kubectl get pdb kube-dns-bbc -o yaml -n kube-system 

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"policy/v1","kind":"PodDisruptionBudget","metadata":{"annotations":{},"labels":{"k8s-app":"kube-dns"},"name":"kube-dns-bbc","namespace":"kube-system"},"spec":{"maxUnavailable":1,"selector":{"matchLabels":{"k8s-app":"kube-dns"}}}}
  creationTimestamp: "2022-02-18T17:07:53Z"
  generation: 1
  labels:
    k8s-app: kube-dns
  name: kube-dns-bbc
  namespace: kube-system
  resourceVersion: "230860"
  uid: 7131c64d-6779-4b23-8c53-10ffcc242144
spec:
  maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: kube-dns
status:
  conditions:
  - lastTransitionTime: "2022-02-18T17:38:13Z"
    message: ""
    observedGeneration: 1
    reason: SufficientPods
    status: "True"
    type: DisruptionAllowed
  currentHealthy: 2
  desiredHealthy: 1
  disruptionsAllowed: 1
  expectedPods: 2
  observedGeneration: 1