* https://www.digitalocean.com/community/tutorials/how-to-configure-dns-round-robin-load-balancing-for-high-availability (including links to other articles for DB replication)

How to synchronize the files between servers? How to setup DNS to auto-switch in case of failure?

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Perhaps I can do DNS lookups on the proxy end, that'd be the best option (Image)

If you can use any external dns server like google or opendns, maybe you can use openvpn and configure it to listen on UDP 53

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Sure, but they wouldn't be looking for SSH connections inside valid DNS packets. See http://blog.y3xz.com/blog/2011/11/01/setting-up-an-iodine-ip-over-dns-proxy or http://www.putdispenserhere.com/bypa

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Have you tried tunneling an SSH session over DNS?

Mail-in-a-box has to be installed in a clean machine and take over all dns requirements for your mail server. This is good and bad. It simplifies the installations, but it is difficult to make custom

You would think given that DNS is a critical feature and the FW is controlled via vesta they would have considered that, things like that make me want to kill people.

Tried to ping google.com and it failed. Disabled the firewall and everything worked as expected, DNS lookups were successful. Enabled the firewall again and everything blocked.

I just implemented GeoDNS using this method: http://phix.me/geodns/ into my DNS servers. The primary server is running Debian 7, Bind 9.8.4, the other one's Ubuntu 14.04, Bind 9.9.5

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If you just wanna connect your IPv6 softether setup, use the dynamic dns they provide. I think they claimed it even works with NAT. So you're good to go.

DNS Clustering is a breeze.

How does it rate on DNS and Mail ?

I have a few small boxes spread around for various things. After some recent advice I picked up a new larger box which I am hosting SEAFILE. Now I would like to move everything over (as a hobby) Web

anyway i'm realising dns isn't really the main problem... several things need to be perfectly replicated on a typical web app of mine: postgresql, redis, elasticsearch...

check rage4dns is a project in with uncle Sal is believing and it's awesome. i'm using is and it has failover supported by NewRelic or api, geodns and you can chance dns in case od failure in less the