Redhat 8 Boot Single User Mode via Serial Console

Linux, RedHat 1 Minute

To boot into single user mode via the serial console you need to edit grub before it boots.

When it starts booting you will see the grub menu, before it starts hit the “e” key to edit. You will see something similar as below. Change the information to whats shown below in BOLD

====================
load_video                                                                      
set gfx_payload=keep                                                            
insmod gzio                                                                     
linux ($root)/vmlinuz-0-rescue-2e2ae80928c8406ca64a9b3427ec91a6 root=/dev/mapp\ 
er/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/r\ 
oot rd.lvm.lv=rhel/swap console=tty0 console=ttyS0,115200 rd.break             
initrd  ($root)/initramfs-0-rescue-2e2ae80928c8406ca64a9b3427ec91a6.img         
                                                                                
                                                                                
                                                                                                                                                           
                                                                                
      Press Ctrl-x to start, Ctrl-c for a command prompt or Escape to           
      discard edits and return to the menu. Pressing Tab lists                  
      possible completions.

Once you boot enter the following to make your partition default and writable. Then do what you need to do.                                             

Everything is under /sysroot
Make it writable: mount -w -o remount /

Thats it, be careful you have full root privledges.

Advertisement
Published