![]() Troubleshoot boot-related issues, and identify services causing problems during startup.Įxample: Checking the boot log. Information about the system boot process, includes services start and fail time, initialization of system components, and any errors or warnings that occurred during the boot process. var/log/boot.log contains the log messages and information related to the system's boot process. Messages generated by the kernel during the boot processĬheck for hardware compatibility, driver loading, and system boot issues.Įxample: Checking hardware-related information from the last boot.The /var/log/dmesg command is useful while checking the system's boot log or diagnosing hardware-related issues and driver problems. sudo cat /var/log/kern.log | grep "error" 5. How to use these logs?ĭiagnose kernel-level problems, identify hardware or driver failures, and analyze system crashes.Įxample: Checking for kernel-related errors. ![]() Kernel-related messages and events, including hardware or driver issues. ![]() var/log/kern.log is is a system log file found in Linux-based operating systems, including Ubuntu and Debian. sudo cat /var/log/auth.log | grep "Failed" 4. Monitor user login activities, detect unauthorized access attempts, and investigate authentication failures.Įxample: Checking failed login attempts.
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