Ensure that the --service-account-private-key-file argument is set as appropriate

Description:

Explicitly set a service account private key file for service accounts on the controller manager.

Rationale:

To ensure that keys for service account tokens can be rotated as needed, a separate public/private key pair should be used for signing service account tokens. The private key should be specified to the controller manager with '--service-account-private-key-file' as appropriate.

You would need to securely maintain the key file and rotate the keys based on your organization's key rotation policy.

Edit the Controller Manager pod specification file '/etc/kubernetes/manifests/kube-controller-manager.yaml' on the master node and set the '--service-account-private-key-file' parameter to the private key file for service accounts.

--service-account-private-key-file=
.