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On Fri, Feb 25, 2005 at 02:35:44PM +0800, Bosco Lau wrote:
> I have been using Apache 1.3.xx under Ultra Monkey HA/Load balancing
> package (load balancing thru NAT). Everything seems to work perfectly
> fine... Until I upgraded to Apache 2.0.53 (prefork). Seems that the
> 'pinging' by the ldirectord is causing problems to the Apache2 server.
> But the even stranger thing is that when I connect directly to the
> Apache2 server without going through the load balancer everything seems
> to be fine (I have even tested it with some stress benchmarking).
>
> I have tested the following conditions:
> Apache 1.3 without LB (load balancing) - OK
> Apache 1.3 with LB - OK
> Apache 2.0.53 without LB - OK !!!
> Apache 2.0.53 with LB - absolutely NUTS !!!
>
> I suspect that Apache2 is reacting strangely to the negotiating/request
> by the ldirectord, which requests and reads a test file from the apache2
> document root and try to compare the content of the test file to that in
> the config file of the ldirectord. But there isn't such a problem with
> Apache 1.3. At the moment the ldirectord is configured to make a request
> to the apache every 1 sec (which is not a high loading at all). My hunch
> is something to the with the Apache2 configuration of the
> multi-threading (???). Maybe the threads from the 'pings' are killing
> the server?
>
> Please advise in anything I can do to the Apache2 or the ldirectord
> configuration, or anything else for that matter.
That sounds really weird. Could you try using a connect check
rather than a negotiate check and see if that makes any difference.
--
Horms
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