System default logs in Linux

/var/log/cron
Logs related to system timing tasks are logged

/var/log/cups
Logs of printed information are logged

/var/log/dmesg
The information of the kernel self-test in the system is recorded, and can be viewed directly by DMESG command.

/var/log/btmp
Log errors logged, cannot be viewed directly, is a binary file, use the LASTB command to view

/var/log/lastlog
Records the last logon time of all users in the system, cannot be viewed directly, is a binary file, use the Lastlog command to view

/var/log/mailog
Record message information

/var/log/message
Record the most important information of the system, if the system has problems, to first check this file

/var/log/secure
Record authentication and authorization information as long as the account password is involved

/var/log/wtmp
Permanent logging of all user logon, logoff information, start, restart, shutdown events, using the last command to view

/var/run/utmp
Log the currently logged-on user information, and with the user's logon logoff constantly changing, use the W who users command to view

Note:
1. In addition to the system default logs, System services installed in RPM will log the logs in the Var/log directory by default
2. The system default log is also determined by the configuration file whether to print:
/etc/rsyslog.conf

System default logs in Linux