What log file stores kernel logs and warning data in a Linux system?

The file that stores kernel logs and warning data in a Linux system is located at /var/log/kernel.log. This log file specifically contains messages produced by the Linux kernel, which can include information about hardware events, driver issues, and various kernel-related warnings.

Kernel logging is essential for troubleshooting hardware and system-level problems, and having a dedicated log file helps manage and filter these messages effectively. The presence of this specific log file makes it easier for administrators to monitor kernel behavior separate from other system logs, like those found in /var/log/syslog, which include a broader range of system and application logs.

The other paths mentioned do not conform to standard Linux file structure for logging kernel messages. For example, /etc/kernel.log does not exist as a conventional log file directory, while /usr/log/kernel.log is also not a standard location for log files in Linux systems, which typically store logs in the /var/log directory.