What is the best way to mirror an Ubuntu server that runs several VMs
to an identical hardware configuration for the purpose of having a
stand-by warm swap server.

The switch from live to the stand-by server can be done manually in
case the live server has a hardware or other type of failure.

After the failure on the former live server has been fixed, I'd like
that mirror process to reverse the roles in the configuration, so the
current live server remains the live one and the just fixed former live
server becomes the stand-by mirror.


TIA,
Adrian


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