User pass change (break the glass)

 

On boot, stop the GRUB loader pressing `E`

 

add to the end of the line, where linux is declared

 

 

press CTRL+X or F10 to boot

 

Mount, set simple password and remember it, touch file to make SElinux happy, sync, remount and initiate clean reboot.

 

Once system is loaded, login and set complex password

 

Idea behind simple and complex passwords is that usually simple pass need to be typed (in hypervisor terminal/console) manually.

Once there is access over SSH, complex password can be generated and pasted from password manager.