# Cis Ubuntu2004 V300 6 3 2 1

> Ensure audit log storage size is configured

- Skill: `cyberstrikeus/cis-ubuntu2004-v300-6-3-2-1` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu2004-v300-6-3-2-1`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu2004-v300-6-3-2-1/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-ubuntu2004-v300-6-3-2-1

---


# 6.3.2.1 Ensure audit log storage size is configured (Automated)

## Profile

- Level 2 - Server
- Level 2 - Workstation

## Description

Configure the maximum size of the audit log file. Once the log reaches the maximum size, it will be rotated and a new log file will be started.

## Rationale

It is important that an appropriate size is determined for log files so that they do not impact the system and audit data is not lost.

## Audit Procedure

### Command Line

Run the following command and ensure output is in compliance with site policy:

```bash
# grep -Po -- '^\h*max_log_file\h*=\h*\d+\b' /etc/audit/auditd.conf
max_log_file = <MB>
```

## Expected Result

The `max_log_file` parameter should be set in accordance with site policy.

## Remediation

### Command Line

Set the following parameter in `/etc/audit/auditd.conf` in accordance with site policy:

```
max_log_file = <MB>
```

## Default Value

`max_log_file = 8`

## References

1. NIST SP 800-53 Rev. 5: AU-8

Additional Information: The `max_log_file` parameter is measured in megabytes. Other methods of log rotation may be appropriate based on site policy. One example is time-based rotation strategies which don't have native support in auditd configurations. Manual audit of custom configurations should be evaluated for effectiveness and completeness.

## CIS Controls

| Controls Version | Control                               | IG 1 | IG 2 | IG 3 |
| ---------------- | ------------------------------------- | ---- | ---- | ---- |
| v8               | 8.3 Ensure Adequate Audit Log Storage | X    | X    | X    |
| v7               | 6.4 Ensure adequate storage for logs  |      | X    | X    |

MITRE ATT&CK Mappings: T1562, T1562.006 / TA0040 / M1053