A GKE's Cluster's Kubelet should use TLS authentication

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Description

Disable anonymous requests to the Kubelet server. You should rely on authentication to authorize access and disallow anonymous requests to prevent unwanted actions in your cluster.

Remediation

Choose a remediation method from below. For both steps, a restart of the Kubelet service is required.

Kubelet config file

  1. Add the json below to this file: /etc/kubernetes/kubelet/kubelet-config.json
"authentication": { "x509": {"clientCAFile": "<path/to/client-ca-file>" }}"

Executable arguments

  1. Edit the kubelet service file on each worker node and ensure the below parameters are part of the KUBELET_ARGS variable string.
--client-ca-file=<path/to/client-ca-file>