If you hit CTRL+ALT+Delete your host will go down under CentOS Linux 5.x. The solution is hit CTRL key thrice. Now it will disable CTRL+ALT+Del for host. Next just hit alt+del to complete guest CTRL+ALT+Del cycle.
Alternatively, you can type the following on host to shutdown vps:
xm shutdown myGuestVpsOsName
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{ 2 comments… read them below or add one }
you could also disable the ctrl-alt-delete for the host via /etc/inittab by commenting the following line: ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now
why not just type:
xm reboot