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Need help on resetting root password of a CentOS which is a guess OS (domU) in XEN. I already tried to get to grub but it doesn't display or maybe using a different grub (pygrub). Thanks in advance.

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Do you have control of the Dom0? – fukawi2 Apr 15 '13 at 4:21
Please post the DomU-configuration. What XEN-Server ist this, which CentOS-major version, how is the DomU disk configured? – Nils Apr 17 '13 at 10:42

2 Answers 2

up vote 2 down vote accepted

Shut down the guest VM, mount its disk on another VM that you have access to, then manually change the guest's /etc/shadow, or do a chroot to the mounted disk followed by "passwd".

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If you have access to the parent:

xm console $vm

Will drop you into the console (can be escaped out of like telnet).

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