As errors are seen only when Nginx is front of Apache, I thought there is some configuration parameter tuning needed when Nginx is in picture.
My plan is to migrate to Nginx completely, but I can't do it right now - N On Wed, Feb 11, 2015 at 6:10 PM, Steve Holdoway <[email protected]> wrote: > If the apache access logs are showing a 500, then it's pointing to a PHP > problem isn't it??? What's in the php-fpm logs? > > BTW if you're running php as fpm, why are you using apache at all? I > certainly don't. > > Cheers, > > > Steve > > On Wed, 2015-02-11 at 16:07 -0800, neubyr wrote: > > > > I have Nginx as reverse proxy in front of Apache. Nginx is handling > > most of the redirects and static content. Apache is handling PHP > > requests using fastcgi php-fpm. This setup is giving intermittent 500 > > errors, however, there are no errors when Apache is serving traffic > > directly. > > > > > > Below are some key parameters: > > * Apache is using worker MPMs. > > ServerLimit 2048 > > ThreadLimit 100 > > StartServers 10 > > MinSpareThreads 30 > > MaxSpareThreads 100 > > ThreadsPerChild 64 > > MaxClients 2048 > > MaxRequestsPerChild 5000 > > > > > > Nginx is using 2 worker processes and worker_connections is 1024. > > Proxy connections are configured using proxy_pass and not upstream. > > > > > > > > > > Keep-alive is disabled on both Apache and Nginx. > > > > > > Apache access logs show 500 return code, but apache error logs don't > > contain any information. php-fpm logs are empty as well. > > > > > > > > > > > > Nginx debug logs indicates: > > > > > > 2015/02/10 21:21:39 [debug] 10657#0: connect to 127.0.0.1:8080, fd:60 > > #50 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http upstream connect: -2 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 posix_memalign: > > 000000000129B290:128 @16 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 event timer add: 60: > > 60000:1423632159180 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http finalize request: -4, > > “/reviews/truelist?” a:1, c:2 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http request count:2 blk:0 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 post event 00000000012516A8 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 post event 0000000001251710 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 delete posted event > > 0000000001251710 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http upstream request: > > “/reviews/truelist?” > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http upstream send request > > handler > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http upstream send request > > 2015/02/10 21:21:39 [debug] 10657#0: *49 chain writer buf fl:1 s:369 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 chain writer in: > > 000000000129C1D8 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 writev: 369 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 chain writer out: > > 0000000000000000 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 event timer del: 60: > > 1423632159180 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 event timer add: 60: > > 60000:1423632159181 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 delete posted event > > 00000000012516A8 > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http run request: > > “/reviews/truelist?” > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http upstream check client, > > write event:1, “/reviews/truelist” > > 2015/02/10 21:21:39 [debug] 10657#0: *49 http upstream recv(): -1 (11: > > Resource temporarily unavailable) > > 2015/02/10 21:21:39 [debug] 10657#0: post event 00000000012362B0 > > > > > > > > > > > > > > Another thing I noticed is that http.workers have dropped from 30-40 > > workers to 2 workers with nginx. When Apache is serving traffic > > without Nginx, there are no 500 errors, but it has more workers > > active. > > > > > > > > > > > > > > Any pointers on debugging 500 errors will be really helpful. > > > > > > > > > > -- > > Thanks, > > N > > > > > > _______________________________________________ > > nginx mailing list > > [email protected] > > http://mailman.nginx.org/mailman/listinfo/nginx > > -- > Steve Holdoway BSc(Hons) MIITP > http://www.greengecko.co.nz > Linkedin: http://www.linkedin.com/in/steveholdoway > Skype: sholdowa > > _______________________________________________ > nginx mailing list > [email protected] > http://mailman.nginx.org/mailman/listinfo/nginx
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