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Resetting the root password on RHEL 7 Systems

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How to Reset Root Passwords on RHEL 7 and CentOS 7 Linux Systems If you have forgotten your root password on a RHEL 7 server or a CentOS 7 server, you can reset your root password as long as you have access to the GRUB 2 bootloader. (The following example was performed on a RHEL 7.5 server)
To access the GRUB 2 bootloader, boot your system and wait for the GRUB 2 menu to appear:

Boot System and wait for GRUB 2 menu Boot your system and wait until the GRUB2 menu appears. On some systems you may need to press the "Escape" key to access the GRUB 2 menu.