Linux Rescuing System with Lost Root Password

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Internal

Procedure

Boot in "rescue mode" with a rescue CD.

Choose "Troubleshooting" then "Rescue a CentOS Linux system", then choose 1) (“Continue”). The rescue environment mounts the Linux installation as /mnt/sysimage.

Use the root filesystem with chroot. 

chroot /mnt

Change the root password as usual, then 

exit
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