Reset root Password2020/03/10 |
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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 Linux (4.18.0-147.5.1.el8_1.x86_64) 8 (Core)
CentOS Linux (4.18.0-147.3.1.el8_1.x86_64) 8 (Core)
CentOS Linux (4.18.0-80.11.2.el8_0.x86_64) 8 (Core)
CentOS Linux (0-rescue-b3f4d72a5acb4909897845f43ce9df64) 8 (Core)
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 gfx_payload=keep
insmod gzio
linux ($root)/vmlinuz-4.18.0-147.5.1.el8_1.x86_64 root=/dev/mapper/cl-root ro \
crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swa\
p console=ttyS0,115200n8 rw init=/bin/bash
initrd ($root)/initramfs-4.18.0-147.5.1.el8_1.x86_64.img $tuned_initrd
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
.....
.....
[ 4.027227] SGI XFS with ACLs, security attributes, no debug enabled
[ 4.031995] XFS (dm-0): Mounting V5 Filesystem
[ 4.038038] XFS (dm-0): Ending clean mount
[ 4.362473] systemd-journald[231]: Received SIGTERM from PID 1 (systemd).
[ 4.377833] bash: 16 output lines suppressed due to ratelimiting
# after initramfs switch_root prompt is displayed, do like follows
bash-4.4#
# set SELinux relabeling on next boot if you enabling SELinux bash-4.4# touch /.autorelabel
# set password bash-4.4# passwd Changing password for user root. New password: Retype new password: passwd: all authentication tokens updated successfully. # restart System and complete to reset bash-4.4# exec /sbin/init
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