Linux kernel log Recipe

1. Ensure you're logged in as root.
2. The kernel log may be quite large (e.g. multiple GB), so consider changing to a directory with plenty of free space.
3. Execute the following command to write the kernel log to a file:

   journalctl --since "24 hours ago" &>> diag_kernel_$(hostname).txt || cat /var/log/messages &>> diag_kernel_$(hostname).txt || cat /var/log/syslog &>> diag_kernel_$(hostname).txt || dmesg &>> diag_kernel_$(hostname).txt

4. Consider gzipping the file:

   gzip diag*txt

5. Upload diag*

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