Edit grub2 boot menu, press e key for edit.
Move your cursor ( HINT: move to end of the line with CTRL+E )
on rhgb quiet keywords and replace them with init=/bin/bash
Once you edit the boot line as show above press CTRL + x to start booting your system into a single mode.
# mount | grep root
In order to mount our partition with Read/Write flag we use mount with a remount option as follows:
# mount -o remount,rw /
# passwd
SELinux relabeling
The additional step which needs to be taken on SELinux enables Linux system is to relabel SELinux context. If this step is ommited you will not be able to login with your new root password. The following command will ensure that the SELinux context for entire system is relabeled after reboot:
# touch /.autorelabel
# exec /sbin/init
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