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I would ask you if HAProxy load balancer can be live injectioned (reconfigured without restarting the balancer) without losing connections.

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Reconfiguring haproxy can be done by modifying the configuration file and then sending SIGHUP to the running process. Usually, you can use /etc/init.d/haproxy reload. This should do graceful reload and not drop your connections.

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You can disable/enable servers using the socket file.. but I don't think you are able to add remove servers. The newer versions of haproxy when you send a SIGHUP to it will gracefuly reload and not even reset the stats when you change the config.

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