Using IPTables: http://wiki.openvz.org/Traffic_accounting_with_iptables Using proc: http://wiki.openvz.org/Traffic_accounting_through_proc
OpenVZ: Physical to container
http://wiki.openvz.org/Physical_to_VE
Protected: Playing with OpenVZ – Part 1
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Virtualization Technologies
Here are some good resources about comparision of different virtualization technologies: TechComparison – virtualization technologies comparision OpenVZ Fedora7VirtQuickStart OpenVZ-User-Guide