Am 14.02.2016 um 07:15 schrieb Cedric Malitte:
Thanks Robert,
Having 2 separate servers would mean domain splitting in a way. So I'll have to dispatch incoming mail, and maintain 2 or more users databases. Well I could only maintain one, and let the DB replicate itself to other servers and only grab the users they are allowed to.
We have many domain aliases for many countries and a dozen users traveling around the globe. So geo balacing would not be the best for them.
hm... you could do some dns setup which gives differ results for your mail servers depending to the clients source ip
But the redundancy is missing.... if one server goes down, I loose a bunch of users and that's not what I am looking for.
yes storage and balancing is the problem, there are differ ways to solve it
I looked for providers offering that, but I guess my bosses would not let me spend over 3000$ per month on that. Else I would already have the mails hosted by microsoft and have a cocktail on the beach :)
a selfdone setup will not be cheap too
I'm not any kind of guru, I do not have any disciples. I did kernel mod development on embedded systems with freebsd 4 and 5, I still develop some linux kernel drivers for proprietary systems from time to time. My main degree is electronic engineering and I also graduated in computing related to management in other words I learned a bit of everything to be able to manage teams developers and understand what they do.
what i mean is experts in mail setups not your degree
Looks like it's doable, so I'll continue to dig and experiment.
of course it can be done ,but i think you will have a hard time unless you get help from people with experience in that
Best regards
Cedric
2016-02-13 16:05 GMT-05:00 Robert Schetterer rs@sys4.de:
Am 13.02.2016 um 04:00 schrieb Cedric Malitte:
Hi,
I use dovecot for a long time now, but only as a single isolated server each time.
I joined a company a few years back. We had trouble with compagnies hosting our mail, supposedly full redundant and so on.
The company is small, but we have many dealers around the world, and it's growing.
Mail became the fist choice for clients to contact the dealers. No mail, and we loose sales.
For now we have a single server ( with a backup ) on east coast. And sometimes peoples from EU complain about speed.... ah users :)
What I'd like to implement is a redundant system with 2 servers, one in NA, one in EU. And I'd also like to be able to add another server if needed on the west coast.
Idea is, that if a server goes down, the users will be able to still receive and send mails, and never loose mails.
For geobalacing and failover, I read that I can do it with DNS ( I'm with easydns ).
I'm at the first stage where I collect informations that I try to understand and foresee a solution.
First idea is to set up servers with a mysql master, slaves and a glusterfs in replica mode on the servers. I tried glusterfs on FreeBSD and OMG, it's slow as hell ! ( well maybe it's a trouble on the VMs nics ) On centos it's way better. But I read there might be trouble/index corruption for the mail storage on "shared" space using maildir.
I also had a look at dsync, but I wonder if it can be used on more than 2 servers.
I found many pages on dovecot clusters using shared storage NFS mounted, but I feel it's not really what I need as the servers will be in different datacenters.
So any guide, clue hint would be really appreciated for me to do my homework !
Regards.
Cedric
complicated and expensive for a small company why not have one imap server in US and the other in EU so US Users should have their Mailboxes on the US Server EU users should have their Mailboxes on the EU Server
Smtp you might manage via smtp routing, perhaps with subdomains us eu and aliasing
Or you might take some paid service which has geo stuff allready up and and running, dont try or think of doing it yourself, unlees youre a guru
Best Regards MfG Robert Schetterer
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Best Regards MfG Robert Schetterer
-- [*] sys4 AG
http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München
Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein