Reset root Password2016/01/31 |
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If you forgot root Password, it's possible to reset it like follows.
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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 (3.10.0-327.4.4.el7.x86_64) 7 (Core) with debugging
CentOS Linux (3.10.0-327.4.4.el7.x86_64) 7 (Core)
CentOS Linux (3.10.0-327.3.1.el7.x86_64) 7 (Core) with debugging
CentOS Linux (3.10.0-327.3.1.el7.x86_64) 7 (Core)
CentOS Linux 7 (Core), with Linux 3.10.0-229.el7.x86_64
CentOS Linux 7 (Core), with Linux 0-rescue-ffa496be96ad482cb94373394cec7
Use the ^ and v keys to change the selection.
Press 'e' to edit the selected item, or 'c' for a command prompt.
setparams 'CentOS Linux (3.10.0-327.4.4.el7.x86_64) 7 (Core)' 'fedora'
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod xfs
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='hd0,msdos1' c4df086e-3699-4e02-b7cf-b47e614f6920
else
search --no-floppy --fs-uuid --set=root c4df086e-3699-4e02-b7cf-b47e614f6920
fi
# add "rw init=/bin/bash" to the end of line
# remove "rhgb", "quiet", "LANG=***" all if there are in this line
linux16 /vmlinuz-3.10.0-327.4.4.el7.x86_64 root=/dev/mapper/centos-root \
ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap console=ttyS0,115200n8
systemd.debug rw init=/bin/bash
initrd16 /initramfs-3.10.0-327.4.4.el7.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 udev Coldplug all Devices.
Stopping udev Coldplug all Devices...
[ OK ] Started Plymouth switch root service.
[ 6.814528] systemd-journald[95]: Received SIGTERM from PID 1 (systemd).
bash-4.2#
# after initramfs switch_root prompt is displayed, do like follows # set SELinux relabeling on next boot if you enabling SELinux bash-4.2# touch /.autorelabel
# set password bash-4.2# passwd Changing password for user root. New password: Retype new password: passwd: all authentication tokens updated successfully. # restart System and complete to reset bash-4.2# exec /sbin/init
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