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Lock files are stored here in /var/lib/vz/lock/. Any chance this directory is not writable/missing ?


Your configuration is correct, you have however selected snapshot, which is zero-downtime container backup. Seemingly your LVM however isn't setup correctly so the snapshot can't be done. I would recommend to try with suspend mode. (which has very little downtime)


iptables supports connection/rate limit. From iptables man page: connlimit Allows you to restrict the number of parallel connections to a server per client IP address (or client address block). [!] --connlimit-above n Match if the number of existing connections is (not) above n. --connlimit-mask prefix_length Group ...


There's only a single kernel in an OpenVZ system, so you would have to run rngd on the host node.

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