cis-gcp-cos-4-2

name	cis-gcp-cos-4.2
description	Ensure logrotate is configured
category	cis-gcp-cos
version	1.2.0
author	cyberstrike-official
tags	["cis","gcp","container-optimized-os","logging","logrotate","log-files"]
cis_id	4.2
cis_benchmark	CIS Google Container-Optimized OS Benchmark v1.2.0
tech_stack	["gcp","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

4.2 Ensure logrotate is configured (Manual)

Description

The system includes the capability of rotating log files regularly to avoid filling up the system with logs or making the logs unmanageably large.

Rationale

By keeping the log files smaller and more manageable, a system administrator can easily archive these files to another system and spend less time looking through inordinately large log files.

Audit Procedure

Review /etc/logrotate.conf and /etc/logrotate.d/* and verify logs are rotated according to site policy.

# cat /etc/logrotate.conf
# ls /etc/logrotate.d/

Expected Result

The output should show logrotate configuration files with appropriate rotation policies (e.g., daily, weekly, rotate count, compress settings) matching site policy.

Remediation

Edit /etc/logrotate.conf and /etc/logrotate.d/* to ensure logs are rotated according to site policy.

/etc is stateless on Container-Optimized OS. Therefore, /etc cannot be used to make these changes persistent across reboots. The steps mentioned above needs to be performed after every boot.

Default Value

If no maxage setting is set for logrotate a situation can occur where logrotate is interrupted and fails to delete rotated logfiles. It is recommended to set this to a value greater than the longest any log file should exist on your system to ensure that any such logfile is removed but standard rotation settings are not overridden.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	8.3 Ensure Adequate Audit Log Storage - Ensure that logging destinations maintain adequate storage to comply with the enterprise's audit log management process.	x	x	x
v7	6.4 Ensure adequate storage for logs - Ensure that all systems that store logs have adequate storage space for the logs generated.		x	x

Profile

• Level 2 - Server