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MySQL Master/Master Replication with Heartbeat, DRBD, Apache/PHP/Varnish MegaHOWTO

I created this HOWTO while building a new development environment. The intention is to take a single Apache2/Varnish/MySQL environment and scale it to two servers, with one effectively a ???hot-standby??? – increase redundancy and continuity whilst maintaining current performance. This HOWTO is based on Linux Debian