##  How to regenerate cluster-agents.

kubectl patch clusters.management.cattle.io <REPLACE_WITH_CLUSTERID>--type=‘json’ -p=‘[{“op”: “replace”, “path”: “/status/apiEndpoint”,“” }, {“op”: “replace”, “path”: “/status/provider”,“”}, {“op”: “replace”, “path”: “/status/driver”,“” }]’ 

or 

kubectl patch clusters.management.cattle.io <REPLACE_WITH_CLUSTERID> -p '{"status":{"agentImage":"dummy"}}'

Also Check https://gist.github.com/superseb/076f20146e012f1d4e289f5bd1bd4971

 ## How to re-generate the  rancher-webhook 

1. Remove rancher.cattle.io validating and mutating webhooks, as well as the webhook service:
kubectl delete mutatingwebhookconfigurations rancher.cattle.io 
kubectl delete validatingwebhookconfigurations rancher.cattle.io
kubectl -n cattle-system delete service webhook-service

2. Navigate to Apps & Marketplace in the local cluster Explorer, Installed Apps, and

 perform an 'upgrade' of rancher-webhook to trigger the recreation of deleted resources 

and a new rancher-wehbook-tls certificate secret.

##  How to extend the RKE2 etcd db size

The default etcd size is 2 GB; when the etcd is almost complete, you can expand the etcd DB size.  To expand the etcd, at least the etcd is up and running.

From the Rancher UI, you can edit the RKE2 cluster and add etcd-arg under the

 MachineSelectorConfig.

machineSelectorConfig: - config: etcd-arg: - backend-quota-bytes=8589934592 kubelet-arg: - image-gc-high-threshold=85 - image-gc-low-threshold=80 protect-kernel-defaults: false

From the terminal:

you can add etcd-arg like below:

## $ cat /etc/rancher/rke2/config.yaml 
token: secret
etcd-arg:
  - "quota-backend-bytes=858993459"
  - "experimental-initial-corrupt-check=true"
  
$ journalctl -u rke2-server |grep quota

(or)

## If the config file is in the config.yaml.d

mkdir -p /etc/rancher/rke2/config.yaml.d
echo "etcd-arg+: ["backend-quota-bytes=8589934592"] > /etc/rancher/rke2/config.yaml.d/etcd-quota.yaml
systemctl restart rke2-server