Date: Thu, 28 Apr 2005 06:27:52 -0500 From: Eric Anderson <anderson@centtech.com> To: etiennel@datapro.co.za Cc: freebsd-isp@freebsd.org Subject: Re: load balancing - email server Message-ID: <4270C8B8.4080002@centtech.com> In-Reply-To: <200504281124.38084.etiennel@datapro.co.za> References: <005201c54b92$0cf63e60$0701a8c0@CIRIUM> <200504280944.12838.etienne@unix.za.org> <20050428080402.GP95908@e-Gitt.NET> <200504281124.38084.etiennel@datapro.co.za>
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Etienne Ledoux wrote: > On Thursday 28 April 2005 10:04, Oliver Brandmueller wrote: > >>Hi. >> >>On Thu, Apr 28, 2005 at 09:44:12AM +0200, Etienne Ledoux wrote: >> >>>I have a similar setup but I use ipf (ipnat round-robin) for my load >>>balancing, on a freebsd box infront of the machines. Works just as good. >> >>Never looked at it; is it able to do weighting and failover? How does it >>detect, if a service is down on one of the machines, so that you don't >>have every third connection failing? >> > > > Well I guess it's not that fancy. It's just plain vanilla round-robin load > balancing. I use other tools to detect services that die, queues not clearing > etc. I also use freevrrpd for failover. There use to be a project called > lload. This apparently in conjunction with ipfw could do weighted load > balancing but I can't seem to find that anymore. I guess it died. I'm sure > there might be similar projects though. Round-robin is typically considered 'load distribution', where the load is evenly distributed amongst a list of hosts, but not balanced by how loaded the machine is or if the machine is even down. CARP, which will be in 5.4R I believe (and is in 6.0-CURRENT now), is like VRRP, but with more knobs, whistles, and features. You should look into CARP for this. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------
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