How to Reset Root Password in Oracle Linux 7

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1. While booting GRUB 2 Edit Menu Option (by pressing E)

2. Select the line starts with linux16**** (or linuxefi**** for UEFI bios)  and append "rd.break" at the end of the line.

Example:

linux16 **** rd.break

3. Press ctrl+x to boot or start.

4. First we will remount the sysroot file system in read and write mode and then use chroot to got into a chroot jail:

# mount -o remount,rw /sysroot
# chroot /sysroot

5. Type passwd command in the command line and press same password twice for reset root password:

# passwd

6. Make sure that all unlabel files ( including shadow ) get relabeled during booting:

# touch /.autorelabel

7. Type the command to sync:

# sync

8. Type twice exit command to leave & logout.

9. The system will apply some SELinux contexts and reboot.