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9.8. 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:

There are occasions you want to boot in non-graphical mode ( in runlevel 3 ) for troubleshooting because the system fails to boot the usual way, X fails to start or some module it fails to load.

Here is how you do it when Grub is your boot loader:

At the grub boot menu press the E key. Next select the distro you want to boot and press the E key again. Now select the line with "kernel /boot/vmlinuz" and hit the E key one more time. Now type a space and the number 3 at the end of that line, so for example from:

 

QUOTE
kernel /boot/vmlinuz-2.6.17 ro root=/dev/hda6
to
 
QUOTE
kernel /boot/vmlinuz-2.6.17 ro root=/dev/hda6 3

Finally press the B key and your distro will boot in runlevel 3


NOTE: Runlevel 3 does not work in Ubuntu . . . . use the "rescue mode" you see in the Ubuntu boot menu.

NOTE 2: In recent Mandriva versions Grub has a graphical menu where you can press F2 to edit boot options . . . simply add the number 3 and press the Enter key to boot in runlevel 3.

 

E.7. Changing Runlevels at Boot Time

Changing Runlevels at Boot Time

Under Fedora, it is possible to change the default runlevel at boot time.

To change the runlevel of a single boot session, use the following instructions:

Changing Runlevels at Boot Time

2.10. Changing Runlevels at Boot Time

Under Red Hat Enterprise Linux, it is possible to change the default runlevel at boot time.

If using LILO, access the boot: prompt by typing [Ctrl]-[X]. Then type:

linux <runlevel-number>

In this command, replace <runlevel-number> with either the number of the runlevel to boot into (1 through 5), or the words single or emergency.

If using GRUB, follow these steps:

 

For more information about runlevels, refer to Section 1.4.1 Runlevels.

 



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