I'm confused as to whether http://www.packetfence.org/downloads/PacketFence/doc/PacketFence_Clustering_Guide-5.4.0.pdf represents the instructions for Active/Passive setup, or only Active/Active setup. I am interested in taking the least complicated approach--in addition to the standalone configuration described in the other guides--to having a fail-over option that can be switched over on the order of a couple of minutes, not instantaneously, nor taking hours.
I think that guide is telling me that even in an active/passive mode, the active and passive servers need to share a database, and that to do so reliably requires something like DRBD. Is this a correct interpretation? Because, I'd really like to avoid kernel mods and such, if active/passive can be done without them. I've searched the mailing list, and I see relatively few references to DRBD, but several references, including in May of this year, to synchronizing state in other, scripted ways.
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