CIS-1.2.20 - Ensure that the API Server --audit-log-maxbackup argument is set to 10 or as appropriate

Ensure that the API Server --audit-log-maxbackup argument is set to 10 or as appropriate

Framework

CIS

Severity

Medium

Description of the the issue

Kubernetes automatically rotates the log files. Retaining old log files ensures that you would have sufficient log data available for carrying out any investigation or correlation. For example, if you have set file size of 100 MB and the number of old log files to keep as 10, you would approximate have 1 GB of log data that you could potentially use for your analysis.

Related resources

Pod

What does this control test

Retain 10 or an appropriate number of old log files.

How to check it manually

Run the following command on the Control Plane node:

ps -ef | grep kube-apiserver

Verify that the --audit-log-maxbackup argument is set to 10 or as appropriate.

Remediation

Edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the Control Plane node and set the --audit-log-maxbackup parameter to 10 or to an appropriate value.

--audit-log-maxbackup=10

Impact Statement

None

Default Value

By default, auditing is not enabled.

Example

No example