Log files for the API server should be rotated at 100 MB
Set up the kubernetes integration.
Description
Rotate log files on reaching 100 MB or as appropriate.
Rationale
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. 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.
Audit
Run the following command on the master node:
ps -ef | grep kube-apiserver
Verify that the --audit-log-maxsize argument is set to 100 or as appropriate.
Edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the master node and set the --audit-log-maxsize parameter to an appropriate size in MB. For example, to set it as 100 MB: --audit-log-maxsize=100
Impact
None
Default value
By default, auditing is not enabled.
References
- https://kubernetes.io/docs/admin/kube-apiserver/ 2. https://kubernetes.io/docs/concepts/cluster-administration/audit/ 3. https://github.com/kubernetes/features/issues/22
CIS controls
Version 6 6.3 Ensure Audit Logging Systems Are Not Subject To Loss (i.e. rotation/archive) Ensure that all systems that store logs have adequate storage space for the logs generated on a regular basis, so that log files will not fill up between log rotation intervals. The logs must be archived and digitally signed on a periodic basis. Version 7 6.4 Ensure adequate storage for logs Ensure that all systems that store logs have adequate storage space for the logs generated.
