The main purpose of dmesg is to display kernel messages. dmesg can provide helpful information in case of hardware problems or problems with loading a module into the kernel. In addition, with dmesg, you can determine what hardware is installed on your server. During every boot, Linux checks your hardware and logs information about it. You can view these logs using the command /bin/dmesg.
Clearing the kernel ring buffer
If you want you can backup the logs using dmesg > filename before clearing it. Just execute the following command to clear and frest start the ring buffer loggin (make sure you have logged in as root).
# dmesg -c
Execute the command dmesg to make sure the logs are cleared. Check man dmesg for more help.
Disabling USB ports
If you administrating a small or large workstations running with Linux Desktops and want to disable the USB ports for security so that no one can copy the data via pen drive, try the following steps to disable the USB port(s).
Edit the grub.conf and add the following lines(you need to login as root).
# vi /boot/grub/grub.conf
Then add the following lines on the right kernel version
kernel /vmlinuz
Save and exit the file and reboot the system to disable the USB ports and the boot time.
Root user login on VSFTP
As you know ftp servers normally wont allow to login as root user or any of the local user (Example : daemon,bin, sys, nobody…etc) due to security and preventing the ftp servers from ftp brute force scanner attacks. If you still want to enable root user login on vsFTP for some reasons, here is a short tutorial which allows you to do that.
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