One of the advantages of single-user mode is that you do not need a boot diskette or CD-ROM; however, it does not give you the option to mount the file systems as read-only or not mount them at all.
If your system boots, but does not allow you to log in when it has completed booting, try single-user mode.
In single-user mode, your computer boots to runlevel 1. Your local file systems are mounted, but your network is not activated. You have a usable system maintenance shell. Unlike rescue mode, single-user mode automatically tries to mount your file system; do not use single-user mode if your file system can not be mounted successfully. You can not use single-user mode if the runlevel 1 configuration on your system is corrupted.
On an x86 system using GRUB as the boot loader, use the following steps to boot into single-user mode:
If you have a GRUB password configured, type p and enter the password.
Select Red Hat Enterprise Linux with the version of the kernel that you wish to boot and type a to append the line.
Go to the end of the line and type single
as a separate word (press the
Back at the GRUB screen, type b to boot into single-user mode.
On an x86 system using LILO as the boot loader, at the LILO boot prompt
(if you are using the graphical LILO, you must press
For all other platforms, specify single as a kernel parameter at the boot prompt.