![]() On the end of the line add the word ‘ single’, with white space before ‘ single’, and press ENTER to accept the change. ![]() Once you have entered the kernel edit mode, find the line beginning with kernel, and highlight it, and press ‘ e’ key to edit it. On the GNU GRUB menu highlight the kernel you want to boot, and press ‘ e’ key to edit the kernel commands before booting. Press any key to enter the GNU GRUB menu. Boot to single user modeĭuring the CentOS boot process, you will be presented with a countdown before CentOS boot process actually begins to load the OS. ![]() If you have forgotten root user password on your CentOS 6 machine, you can reset the password to new value, without knowing the old one, by booting the machine to single user mode, and resetting the password with passwd command.
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