Determine how many log files
auditd should retain when it rotates logs.
Edit the file /etc/audit/auditd.conf. Add or modify the following
line, substituting NUMLOGS with the correct value of :
num_logs = NUMLOGS
Set the value to 5 for general-purpose systems.
Note that values less than 2 result in no log rotation.
Rationale
The total storage for audit log files must be large enough to retain
log information over the period required. This is a function of the maximum log
file size and the number of logs retained.
ISA-62443-2-1-2009, Security for Industrial Automation and Control Systems Part 2-1: Establishing an Industrial Automation and Control Systems Security Program