Changing Runlevels at Boot Time

Under Red Hat Enterprise Linux, it is possible to change the default runlevel at
boot time. To change the runlevel of a single boot session, use the following
instructions:

When the GRUB menu bypass screen appears at boot time, press any key to
enter the GRUB menu (within the first three seconds).

  • Press the a key to append to the kernel command.
Add at the end of the boot options line to boot to the desired
runlevel.For example, the following entry would initiate a boot process into
runlevel 3:

  • grub append> ro root=/dev/VolGroup00/LogVol00 rhgb quiet 3

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