2.1.9 Ensure that the --hostname-override argument is not set

Information

Do not override node hostnames.

Rationale:

Overriding hostnames could potentially break TLS setup between the kubelet and the apiserver. Additionally, with overridden hostnames, it becomes increasingly difficult to associate logs with a particular node and process them for security analytics. Hence, you should setup your kubelet nodes with resolvable FQDNs and avoid overriding the hostnames with IPs.

Solution

Edit the kubelet service file '/etc/systemd/system/kubelet.service.d/10-kubeadm.conf' on each worker node and remove the '--hostname-override' argument from the 'KUBELET_SYSTEM_PODS_ARGS' variable.

Based on your system, restart the 'kubelet' service. For example:

systemctl daemon-reload
systemctl restart kubelet.service

Impact:

Node hostnames should have resolvable FQDNs.

See Also

https://workbench.cisecurity.org/files/2125

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CSCv6|3

Plugin: Unix

Control ID: c216992439a802c839cea8e91284d85c7d4d3794f331f759bc2ca1009fc86682