disable kubelet_authorization_mode_webhook by default (#9238)

docs/hardening.md

@@ -74,7 +74,6 @@ kube_kubeadm_scheduler_extra_args:
 etcd_deployment_type: kubeadm
 
 ## kubelet
-kubelet_authorization_mode_webhook: true
 kubelet_authentication_token_webhook: true
 kube_read_only_port: 0
 kubelet_rotate_server_certificates: true

roles/kubespray-defaults/defaults/main.yaml

@@ -474,7 +474,7 @@ rbac_enabled: "{{ 'RBAC' in authorization_modes }}"
 kubelet_authentication_token_webhook: true
 
 # When enabled, access to the kubelet API requires authorization by delegation to the API server
-kubelet_authorization_mode_webhook: true
+kubelet_authorization_mode_webhook: false
 
 # kubelet uses certificates for authenticating to the Kubernetes API
 # Automatically generate a new key and request a new certificate from the Kubernetes API as the current certificate approaches expiration