High availability of Dovecot

[luckydog xf]

It seems that  we got 2 solutions.

1. use DNS MX record and dsync plugin of dovecot. No shared storage.
2. use VIP and shared storage.

I'll try both of them, thank you guys.

On Thu, Apr 11, 2019 at 8:45 PM Gerald Galster via dovecot <
dovecot at dovecot.org> wrote:

>
>
> > Am 11.04.2019 um 13:45 schrieb Patrick Westenberg via dovecot <
> dovecot at dovecot.org>:
> >
> > Gerald Galster via dovecot schrieb:
> >
> >> mail1.yourdomain.com <http://mail1.yourdomain.com> IN A 192.168.10.1
> >> mail2.yourdomain.com <http://mail2.yourdomain.com> IN A 192.168.20.1
> >>
> >> mail.yourdomain.com <http://mail.yourdomain.com>  IN A 192.168.10.1
> >> mail.yourdomain.com <http://mail.yourdomain.com>  IN A 192.168.20.1
> >>
> >>
> >> mail1/mail2 is for direct connection (MTAs)
> >>
> >> Your users (outlook, thunderbird, ...) connect to mail.yourdomain.com
> >> <http://mail.yourdomain.com> which returns the two ip addresses.
> >>
> >> In this scenario MUA just connects to mail.yourdomain.com
> >> <http://mail.yourdomain.com> and randomly uses one of the two ips. You
> >> can't control which one, but this gives you active/active loadbalancing.
> >> In case one server is down the MUA just uses the other ip.
> >
> > Are you sure that this is working?
>
>
> yes, I'm running a two node dsync cluster in production for a few years
> without issues.
> The system was even working during a whole datacenter outage because the
> nodes reside
> in different, distant locations. I would'nt use a filesystem like ceph
> with distant
> locations due to latency issues. dsync replication is asynchronous, so
> there is no problem.
>
> Most cluster systems that use drbd, ceph, keepalived, pacemaker, whatever
> are operated
> within a single datacenter or datacenter park. If the datacenter goes
> down, your
> cluster is not reachable anymore. This is a rare event but within 10-15
> years it happens
> to a lot of datacenters.
>
> Best regards
> Gerald
>
>
>
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