Login as single user mode on CentOS 8
1. boot on GRUB Menu
2. add argument rd.break behind as follow:
Linux .... rhgb quit rd.break
3. press Ctrl+x for booting
4. mount sysroot as follow
mount -o remount,rw /sysroot
chroot /sysroot
5. check identification as follow
bin/sh# whoami
6. If you want to modify root password
/bin/sh# passwd
if you want to fix sudo suid problem(error message:
, you can use instruction as follow
/bin/sh# chmod u+s /usr/bin/sudo
7. Important!!! #relabel SELinux protected files
/bin/sh# touch / .autorelabel
8. Rebooting machine
/bin/sh# reboot -f
Reference
https://www.linuxtechi.com/boot-centos-8-rhel-8-single-user-mode/
https://www.itzgeek.com/how-tos/linux/centos-how-tos/how-to-boot-into-single-user-mode-in-rhel-8.html
2. add argument rd.break behind as follow:
Linux .... rhgb quit rd.break
3. press Ctrl+x for booting
4. mount sysroot as follow
mount -o remount,rw /sysroot
chroot /sysroot
5. check identification as follow
bin/sh# whoami
6. If you want to modify root password
/bin/sh# passwd
if you want to fix sudo suid problem(error message:
sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set)/bin/sh# chmod u+s /usr/bin/sudo
7. Important!!! #relabel SELinux protected files
/bin/sh# touch / .autorelabel
8. Rebooting machine
/bin/sh# reboot -f
Reference
https://www.linuxtechi.com/boot-centos-8-rhel-8-single-user-mode/
https://www.itzgeek.com/how-tos/linux/centos-how-tos/how-to-boot-into-single-user-mode-in-rhel-8.html
