We tried to harden the gke optimized image (gke-1.15.11) for our cluster. We took an ssh into the node instance and made the cis porposed changes in the /home/kubernetes/kubelet-config.yaml file and ran kubebench to check if all the conditions have passed around 8 condtions failed these where the exact conditions we changed in the file. But, then we made the exact argument changes in /etc/default/kubernetes and ran kubebench again the conditions passed. But, when we restarted the instance we all the changes we made in the /ect/default/kubernetes file where gone. Can someone let me know where we are going wrong or is there any other path where we have to make the cis benchmark suggested entries
Regarding GKE optimised image hardening
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GKE doesn't support user-provided node images as of April 2020. Recommended option is to create your own
DaemonSetwith host filesystem writes and/or host services restart to propagate all the required changes.