System auditing, through auditd, allows system administrators to monitor their systems such that they can detect unauthorized access or modification of data. By default, auditd will audit SELinux AVC denials, system logins, account modifications, and authentication events. Events will be logged to /var/log/audit/audit.log. The recording of these events will use a modest amount of disk space on a system. If significantly more events are captured, additional on system or off system storage may need to be allocated.
The recommendations in this section implement an audit policy that produces large quantities of logged data. In some environments it can be challenging to store or process these logs and as such they are marked as Level 2 for both Servers and Workstations.
Note: For 64 bit systems that have arch as a rule parameter, you will need two rules: one for 64 bit and one for 32 bit systems. For 32 bit systems, only one rule is needed.
Note: Once all configuration changes have been made to /etc/audit/audit.rules, the auditd configuration must be reloaded:
# service auditd reload