Date: Tue, 06 Oct 1998 20:04:56 -0700 From: Graeme Tait <U@webcom.com> To: "Jeffrey J. Mountin" <jeff-ml@mountin.net> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: How to share accounts between mail/pop and web servers? Message-ID: <361ADA58.58B7@webcom.com> References: <87hfxiv0r9.fsf@absinthe.shenton.org> <3.0.3.32.19981006180534.00f762c4@207.227.119.2>
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Jeffrey J. Mountin wrote: [format auto-recovered by secretary.echidna.com] > At 08:53 AM 10/6/98 -0700, Graeme Tait wrote: > >Chris Shenton wrote: > >> > >> I plan to split into two boxes: one for WWW and FTP, the other for > >> SMTP, POP, and IMAP. Not sure where I'm gonna run RADIUS yet, maybe > >> on both for redundancy. > > > > > >May I ask maybe a dumb question, as I am involved as a newbie in setting > >up our own server much like the above (except for dialup), and hope some > >day to have this problem ;-) > > > >Why not duplicate the box and split the users across boxes? That way if > >one box goes down, only half your users suffer. It's scalable, as for > >yet more users you just add another box, and you can load-balance the > >boxes easily for good utilization by allocating users appropriately. > >Configuration is the same from box to box, and having hardware spares is > >easy. The only thing that might connect the boxes is having them do > >secondary DNS for each other. > > This creates overhead in administrating the users. Load balancing implies that you > are mirroring and then the thorny issue of how to mirror comes up. Some day there > will be a good solution for this like Novell's, which mirrors in real time over a > private fibre connection. By "load balancing" I simply meant that if box A had more load than box B, you would allocate the next new user to box B (or move users if necessary). > It's better to break out services to various servers, so that only one service may be > down for the customer. If it's fixed quickly, they usually don't mind, but when > "everything" is down for them. I can see it cutting both ways. If you had say 5 boxes in my model and one went down, 20% of users are affected. If all there email was on one box in the alternate model, 100% of email is down. The model I suggested seems to be that successfully used by pair.com (running FreeBSD, of course). Another advantage of essentially identical boxes is that upgrades can be tested on a subset of the system before total commitment. > Jeff Mountin - Unix Systems TCP/IP networking > jeff@mountin.net -- Graeme Tait - Echidna To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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