How to Reset Root Password in Oracle Linux 7
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.
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