System Log Files
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System log files contain information about the system and its processes. These files are stored in the /var/log directory. Some examples of system log files are:
/var/log/syslog: Contains messages from all system processes.
/var/log/messages: Contains system messages, including kernel messages and system startup messages.
/var/log/dmesg: Contains kernel ring buffer messages, which include hardware events, boot messages, and other system messages.
Application Log Files
Application log files contain information about specific applications and their processes. These files are usually stored in the /var/log directory. Examples of application log files include:
/var/log/apache2/access.log: Contains access logs for the Apache web server.
/var/log/mysql/error.log: Contains error logs for the MySQL database server.
/var/log/nginx/error.log: Contains error logs for the Nginx web server.
Authentication Log Files
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Authentication log files contain information about user login and authentication attempts. These files are usually stored in the /var/log directory. Examples of authentication log files include:
/var/log/auth.log: Contains authentication-related messages, including user logins and password changes.
/var/log/secure: Contains security-related messages, including user logins and authentication attempts.
Kernel Log Files
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Kernel log files contain information about the Linux kernel and its operations. These files are stored in the /var/log directory. Examples of kernel log files include:
/var/log/kern.log: Contains kernel-related messages, including system calls and hardware errors.
/var/log/debug: Contains debug messages for the kernel and other
system components
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These are some examples of log files in Linux. Other types of log files may exist, depending on the software installed on the system.
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