Ensure that the --peer-client-cert-auth argument is set to true

Description:

etcd should be configured for peer authentication.

Rationale:

etcd is a highly-available key value store used by Kubernetes deployments for persistent storage of all of its REST API objects. These objects are sensitive in nature and should be accessible only by authenticated etcd peers in the etcd cluster.

All peers attempting to communicate with the etcd server will require a valid client certificate for authentication.

Edit the etcd pod specification file '/etc/kubernetes/manifests/etcd.yaml' on the master node and set the below parameter.

--peer-client-cert-auth=true
.