Authentication Logs

Authentication logs in Linux record all auth-related events like logins, password changes, and sudo commands. Located at /var/log/auth.log (Debian) or /var/log/secure (RHEL/CentOS), these logs help detect brute force attacks and unauthorized access attempts. Use tail /var/log/auth.log to view recent entries. Regular log analysis is essential for server security monitoring.

Here is an example of how you can use the tail command to view the last few entries of the authentication log:

tail /var/log/auth.log

Visit the following resources to learn more:

• @article@Monitoring Linux Authentication Logs
• @article@How to Check Linux Login History - Linux Handbook