[level 1] Boot CentOS to Single-User-Momde.

If you want any problem need to boot CentOS to  Single-User-Mode,
you can press any key at boot screen and show up grub menu.
Then press 'e' and append "single" at the end of the 'kernel' line.
And press 'b' to boot OS.

And you will see the CentOS boot to Single-User-Mode.

Wish this helps.

regards,
Stanley Huang

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