I currently run a HA postfix/dovecot setup that is failover behind a HAproxy. The two legs are a dovecot 2 on macOS (MacPorts) and a dovecot 2 on Ubuntu (PVE+Ubuntu+Docker), making the system somewhat antifragile. HA is realised via dovecot's own syncing (which is not longer available in dovecot 3). This works OK. (In addition: there is rspamd as an important part of the setup, e.g. for DMARC). There are multiple virtual domains. Given that I have lost APNS (Apple Push Notification) as Apple has retired support for former Mac OS X Server users, there is not longer a reason to keep the macOS version running (apart from that antifragility thing, but that was more an added bonus). I am looking at moving to a different setup where the entire mail setup may move to a full Linux foundation. I am starting to look at future options (there is still time to actually create the setup somewhere the coming year or so. If I want to be future-dovecot proof, I need to move to HA for storage as dovecot syncing is deprecated. I wonder what my best way forward its, based on a 2 physical machine, PVE+Ubuntu+Docker setup. Build a HA NFSv4 cluster? Use Ceph? ZFS? Any tips, experiences, or ideas are welcome. Robustness/security/low-maintenance/own-your-own-data are my main objectives. I do not have high volumes, this is a setup for just a few users. G
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