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:

1. When the GRUB menu bypass screen appears at boot time, press any key to enter the GRUB menu
(within the first three seconds).
2. Press "e" key to append to the kernel command.

3. 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: