RE: [load balancing] ServerIronXL - Real servers failing L4 check for no apparent reason

From: Basil Hussain (basil.hussainIZZATkodakweddings.com)
Date: Wed Jul 14 2004 - 11:14:29 EDT

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    No-one has any ideas on this?

    I really can't figure this out.

    --
    Basil Hussain
    I.T. Systems Developer and Administrator, Kodak Weddings
    basil.hussainIZZATkodakweddings.com
    

    > -----Original Message----- > From: owner-lb-lIZZATvegan.net [mailto:owner-lb-lIZZATvegan.net]On Behalf Of > Basil Hussain > Sent: 12 July 2004 11:19 > To: Load Balancing List > Subject: [load balancing] ServerIronXL - Real servers failing L4 check > for no apparent reason > > > Hi, > > I have a strange problem that I hope someone may be able to shed > some light > on. > > First, let me explain my set-up. I have two physical servers being > load-balanced by a Foundry ServerIron XL. I am balancing four web > sites over > both. Because of the need to do SSL on more than one web site, I > have to do > IP-based virtual hosting. Therefore, I have set up a virtual network > interface (using Linux IP aliasing) for each site. So, it looks like: > > server-a: > site-a: 10.1.1.100 > site-b: 10.1.1.101 > site-c: 10.1.1.102 > site-d: 10.1.1.107 > server-b: > site-a: 10.1.1.110 > site-b: 10.1.1.111 > site-c: 10.1.1.112 > site-d: 10.1.1.117 > > I have eight real servers set up on the LB (one for each > server/site combo), > along with four virtual servers (one for each web site). Each > virtual server > is therefore bound to two real servers. > > The problem I am having is that my ServerIron keeps logging errors approx. > every minute telling me that two of my real servers are failing level 4 > health checks: > > 11-07-2004 23:59:33 ServerIron, L4 server 10.1.1.110 > server-b-site-a port 80 > is down > 11-07-2004 23:59:35 ServerIron, L4 server 10.1.1.100 > server-a-site-a port 80 > is down > 11-07-2004 23:59:39 ServerIron, L4 server 10.1.1.100 > server-a-site-a port 80 > is up > 11-07-2004 23:59:39 ServerIron, L4 server 10.1.1.110 > server-b-site-a port 80 > is up > > But, strangely, it only gives errors for site A! No problems at > all with all > other sites! Also, it doesn't complain about port 443. > > What possible reasons could there be for this behaviour? > > Regards, > > -- > Basil Hussain > I.T. Systems Developer and Administrator, Kodak Weddings > basil.hussainIZZATkodakweddings.com > > P.S. In case anyone asks why I have eight real servers defined, > one for each > server/site combination, it is because of the non-contiguous IP addresses. > Otherwise, I would use the 'host-range' command... > > ____________________ > The Load Balancing Mailing List > Unsubscribe: mailto:majordomoIZZATvegan.net?body=unsubscribe%20lb-l > Archive: http://vegan.net/lb/archive > LBDigest: http://lbdigest.com > MRTG with SLB: http://vegan.net/MRTG > Hosted by: http://www.tokkisystems.com >

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