Red Hat Enterprise Linux 7: Reset forgotten root password.
This video tutorial is part of RHCSA Fast Track course.
Please use below cookbook to reset forgotten or unknown password in Red Hat Enterprise Linux, CentOS Linux, Scientific Linux, Oracle Linux and Fedora.
1) Reset Linux server if it is running
2) press e to edit default entry on grub bootloader menu
3) replace keyword "rhgb quiet" with init=/bin/bash
4) press CTRL + x to boot into root shell
5) remount / (root) filesystem with read write options
5.1) / (root) filesystem is mounted with ro (read-only options)
mount | grep -w "/"
5.2) remount / (root) filesystem with rw (read write) options
mount -o remount,rw /
5.3) doublecheck if / root filesystem has been remouted with rw (read-write) options
mount | grep -w "/"
6) Change root password
7) relabel SELinux context for entire root filesystem
Below command will ensure that the SELinux context for entire filesystem will be relabeled after reboot:
8) Continue boot process - run exec /sbin/init command
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There will be not password protected GRUB on your RHCSA EX200 exam.
If you need to reset root password on systems where GRUB is password protected, please follow procedure from my earlier comment.
If you on the other hand want to have root password bullet proof, please use password protected GRUB and encrypted disk for example with LUKS. Once you will have encrypted root FS (files /etc/passwd, /etc/shadow ...) with LUKS it will be impossible to reset root password without knowing LUKS passphrase.
Thank you very much for watching my video and leaving your comment. It is very appreciated.
If your GRUB is password protected, you will have to boot from CDROM or USB drive to change root password.
Please follow this procedure:
1) Start the system and when BIOS information is displayed, select the option for a boot menu and select to boot from the installation disk.
2) Choose Troubleshooting.
3) Choose Rescue a Red Hat Enterprise Linux System.
4) Choose Continue which is the default option. At this point you will be promoted for a passphrase if an encrypted file system is found.
5) Press OK to acknowledge the information displayed until the shell prompt appears.
6) Change the file system root as follows:
sh-4.2# chroot /mnt/sysimage
7) Enter the passwd command and follow the instructions displayed on the command line to change the root password.
8) Remove the autorelable file to prevent a time consuming SELinux relabel of the disk:
sh-4.2# rm -f /.autorelabel
9) Enter the exit command to exit the chroot environment.
10) Enter the exit command again to resume the initialization and finish the system boot.
This procedure was taken from:
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