Where are the log files of the centos system?

1./var directory

Some databases such as MySQL are under /var/lib. The default storage location for users’ unread emails is /var/spool/ mail

2.:/var/log/

System boot log:/var/log/boot.log, for example:

Feb 26 10:40:48 sendmial : sendmail startup succeeded #邮件服务启动成功!

(recommended tutorial: centos usage tutorial)

System logs generally exist under /var/log. Commonly used system logs are as follows:

/var/log/dmesg      #核心启动日志
/var/log/messages   #系统报错日志，系统启动时的状态信息，运行时的状态信息。比如某个人的身份切换为 root等。如果服务正在运行，比如 DHCP 服务器，您可以在 messages 文件中观察它的活动。

File/var /run/utmp records the currently logged in user.

The file /var/log/lastlog records the last login information of each user.

File /var/log/btmp Logs bad login attempts.

less /var/log/auth.log Operations that require identity confirmation.

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