Re: load balancing - email server

From: Eric Anderson (anderson_at_centtech.com)
Date: 04/28/05

  • Next message: Oliver Brandmueller: "Re: load balancing - email server" 
    Date: Thu, 28 Apr 2005 06:27:52 -0500
To: etiennel@datapro.co.za

    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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  • Next message: Oliver Brandmueller: "Re: load balancing - email server"

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