Reset root Password2022/06/29 |
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If you forgot root Password, it's possible to reset it like follows.
(This is only for the case GRUB boot loader Password is not set) |
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| [1] | Restart System and when GRUB2 boot menu is displayed, Push [e] key. Next, Proceed like follows to reset root password. |
# push [e] key
CentOS Stream (5.14.0-115.el9.x86_64) 9
CentOS Stream (5.14.0-105.el9.x86_64) 9
CentOS Stream (5.14.0-86.el9.x86_64) 9
CentOS Stream (0-rescue-ab414d4792d04b9dbc1e2361f936e849) 9
Use the ^ and v keys to change the selection.
Press 'e' to edit the selected item, or 'c' for a command prompt.
# add [rw init=/bin/bash] to the end of [linux] line
load_video
set gfxpayload=keep
insmod gzio
linux ($root)/vmlinuz-5.14.0-115.el9.x86_64 root=/dev/mapper/cs-root ro crashk\
ernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/cs-swap rd.lvm.lv=cs\
/root rd.lvm.lv=cs/swap console=ttyS0,115200n8 rw init=/bin/bash
initrd ($root)/initramfs-5.14.0-115.el9.x86_64.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.
# after inputting above, push [Ctrl-x] key to proceed
.....
.....
[ OK ] Stopped Rule-based Manager for Device Events and Files.
[ OK ] Closed udev Control Socket.
[ OK ] Closed udev Kernel Socket.
[ OK ] Stopped dracut pre-udev hook.
[ OK ] Stopped dracut cmdline hook.
Starting Cleanup udev Database...
[ OK ] Stopped Create Static Device Nodes in /dev.
[ OK ] Stopped Create List of Static Device Nodes.
[ OK ] Finished Plymouth switch root service.
# after prompt is displayed, do like follows
bash-5.1#
# set SELinux relabeling on next boot if you enabling SELinux bash-5.1# touch /.autorelabel
# set password bash-5.1# passwd Changing password for user root. New password: Retype new password: passwd: all authentication tokens updated successfully. # restart System and complete to reset bash-5.1# exec /sbin/init
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