Paul Graydon wrote: > I've got an identically configured test server in our dev environment. > I've hit the sites on it every which way but actual transactional and > yet to replicate the problem! It would be awesome if we had a whole > series of scripted tests for our sites (over 60 different webapps), but > we don't yet, and I certainly haven't got the time to be able to write > such for now, they're not simple applications. Wish I could narrow down > the range of apps it might be in! > > Atom Powers wrote: > > Can you build another, identical, server and move applications around > > until you find the one that's troublesome? > > > > We have a similar problem with apache, only it actually crashes our > > servers. We went through the same process you describe below but we > > wenen't able to pin it down until we were able to swap applications > > around on many (virtual) servers. > > > > Paul Graydon wrote: > >> Hi all, > >> > >> Putting some feelers out for ideas. I've got apache running using > >> reverse proxy as a load balancer for over 60 different web applications > >> on various servers. Every now and then it'll have a thread that starts > >> to spin, seeming to just frantically do nothing, but Apache keeps on > >> working hosting content successfully. It happens under both MPM Worker > >> and Prefork, and only on the front server, never one of the applications > >> behind it. > >> > >> Isolating the problem is slowly beginning to drive me crazy :) Stracing > >> the process doesn't show anything happening at all. Nothing obvious is > >> happening in the logs. I tried adding a seconds count for responses to > >> see whether anything was routinely slow around the time or leading up to > >> it that might provide hints, to no avail, and tried logging the PID, but > >> again no joy. As I understand it Apache doesn't log until the response > >> has been sent successfully so that's probably not all that surprising. > >> > >> About the only other thing I can think to do at the moment is enable > >> mod_forensics and get it to log requests on receipt as well as at the > >> end and look for in requests without a matching out. > >> > >> Anyone have any suggestions on how else I might track down what is > >> causing this?
A great resource for Apache debugging: http://prefetch.net/presentations/Apache_Presentation.pdf Another great resource: http://www.samag.com/articles/2007/0707/ -- Charles Polisher _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
