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On Thursday 21 June 2007 16:43, Joseph Mack NA3T wrote:
> On Thu, 21 Jun 2007, Rio wrote:
>
> > i assume here you mean because there would be 2 copies of
> > each mailbox with no control over which copy a user reads.
>
> yes
>
> > the mail server software (surgemail) has built-in 2-way
> > mirroring that updates each other within milliseconds of a
> > change..
>
> This has always been a bit of a problem. I didn't know about
> surgemail. I see it's not GPL/FOSS. I can't imagine it would
> be too hard to add this to GPL mailservers.
>
probably not, the biggest problem being that most gpl servers are
multi-software to enable smtp/pop etc. so mirroring would have to be on
several levels, or an additonal software addon... surgemail is integrated
although can be separated in to individual smtp/pop with just ip addressing.
it is somewhat expensive, but after seeing all the features it had i fell in
love with it. the mirroring is done very smartly. been running it 3 yrs and
never looked back.
> >> You'll need two if you want failover.
> >
> > failovers of directors, but if, say, one director handles
> > 2 ips for 2 identical services on 2 servers, if one server
> > goes down does that not do auto-failover for the real
> > server portion?
>
> there's too many "servers" in there. You can failover
> one-by-one individual services running on the realservers
> too if that's what you're asking. That is also handled by
> external packages like mon, ldirectord and keepalived.
>
yes i would need to failover every guest vserver individually in addition to
the host itself. there are dangers of an 'owner' trashing his colo virtual,
or i may need to shut down one particular one for some reason. if i mean to
shut it down for non-payment then i just have to do it twice :) otherwise i
expect the other to pick up the slack till i bring it back up.
this sounds like the area of study i need to be at. just have to learn the
various configurations to figure out what is for us, but it looks like lvs is
the way for us.
thank you!
> Joe
> --
> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
> jmack (at) wm7d (dot) net - azimuthal equidistant map
> generator at http://www.wm7d.net/azproj.shtml
> Homepage http://www.austintek.com/ It's GNU/Linux!
>
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>
--
Rio
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