Common Logs to Check
Below are the Common Linux default log files name and their usage:
Link to original
/var/log/message– Where whole system logs or current activity logs are available.
/var/log/auth.log– Authentication logs.
/var/log/kern.log– Kernel logs.
/var/log/cron.log– Crond logs (cron job).
/var/log/maillog– Mail server logs.
/var/log/boot.log– System boot log.
/var/log/mysqld.log– MySQL database server log file.
/var/log/secure– Authentication log.
/var/log/utmpor/var/log/wtmp– Login records file.
/var/log/yum.log– Yum log files.