If you require Single User mode to correct an issue with your server you will need to log into the VPN, connect to the server via IPMI (SOL or KVM), reboot the server and append the correct runlevel to the kernel line within grub.
When GRUB loads you will need to select the kernel you wish to boot and press the 'e' key to edit the line. note: You can not use 'a' to append to the kernel line as can be done in many other distros.
Append the runlevel to the end of the kernel line.
Hit enter then when in the kernel configuration of GRUB hit 'b' to boot.
A list of the runlevels is as follows:
Runlevel
Description
0
System halt
S
Singleusermode with US
keyboard mapping
1
Singleusermode
2
Local multiuser mode without remote network (e.g., NFS)
3
Full multiuser mode with network
4
Not used
5
Full multiuser mode (not to be used as our installations do not include X)
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