Fun with OpenVPN
I have a bunch of servers scattered around the place: a physical server in one colo, some boxes at home and a couple of Xen VMs. I've been meaning to tie all this together to give my personal stuff some measure of reliability for some time, but keep putting it off. I just slotted one of the pieces into place, though: set up OpenVPN point-to-point links on three servers. So now I have a secure and pretty persistent tunnel between each pair of servers that MySQL can use for replication, Nagios can use for monitoring, and so on.
Getting there ...