my purpose:

one is setup with redhat 9.0 to run my backup DNS server.

then i'd like to play with the other one, such as to try out all other distros.

thanks.
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Roor Bongs

Sure! With 2 Linode's.

Any other solution would be some form of system virtualization on top of Linode's virtualization which A) probably isn't possible, and B) is not a good idea anyway.

You can have 2 distros set up, but they can't run concurrently.

You can compile a UML kernel to run under UML, but you'd need a second IP address to do anything with it (unless you want to fool around with NAT), and I would imagine there'd be a huge performance hit.

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Bus error (passengers dumped)

Is it possible to run a UML instance under UML?

Yes - but with a huge loss of performance. If you divide a UML instance into n sub-UML-instances, they not only have to share already-shared memory and processor power, they have to contend with one another for access to the UML I/O system, which then has to contend with other UML instances for access to the physical I/O system.

My guess: the load goes through the roof as processes block on disk activity.

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/ Peter