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=== Enhancing Security === While it can be interesting to run several virtual servers in one box, there is one concept potentially more generally useful. Imagine a physical server running a single virtual server. The goal is isolate the main environment from any service, any network. You boot in the main environment, start very few services and then continue in the virtual server. The service in the main environment would be: * Unreachable from the network. * Able to log messages from the virtual server in a secure way. The virtual server would be unable to change/erase the logs.\ Even a cracked virtual server would not be able the edit the log. * Able to run intrusion detection facilities, potentially spying the state of the virtual server without being accessible or noticed.\ For example, tripwire could run there and it would be impossible to circumvent its operation or trick it. Another option is to put the firewall in a virtual server, and pull in the DMZ, containing each service in a separate VPS. On proper configuration, this setup can reduce the number of required machines drastically, without impacting performance.
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