hello, the fact that all those 500 error reponses go with "X-Powered-By: PHP/5.6.26" tell me it is php giving those errors.
If you are still unsure, you could use the ab tool from Apache HTTPD, and request a specific static file (text, gif) hundreds of times to see if you get a 500 error from HTTPD. 2016-09-30 8:59 GMT+02:00 Fabio F.Gervasi <fabio.gervas...@gmail.com>: > Hi, > > I'm not 100% sure that the real source of the problem is apache (could be > php or other), but I'd like start from here as the only logs that provides > me with information (with trace4 level) is apache log. No information > appears from other logs. > > I have: > - Linux 4.7.4-100.fc23.x86_64 > - Server version: Apache/2.4.23 (Fedora) > - mysql Ver 15.1 Distrib 10.0.26-MariaDB, for Linux (x86_64) using > readline 5.1 > - PHP Version => 5.6.25 > > The problem: random internal server error 500. Random because, for > example, if a page produces the error and do "reload" then it works. The > same page may not work as well as work. Sometimes you can use the site for > several minutes with no problems, then suddenly there is the error. > > When error occurs, this is all that I get from the log file (with loglevel > = trace4): > > [...] > [Fri Sep 30 07:41:39.151052 2016] [rewrite:trace3] [pid 17957:tid > 140241771534080] mod_rewrite.c(477): [client 151.25.206.200:38368] > 151.25.206.200 - - [www.centrometeo.com/sid#55c3e3673400][rid# > 7f8c8000e9d0/subreq > <http://www.centrometeo.com/sid#55c3e3673400][rid%237f8c8000e9d0/subreq>] > [perdir /home/web/centrometeo.com/] applying pattern '.*' to uri > 'index.php', referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.151092 2016] [rewrite:trace1] [pid 17957:tid > 140241771534080] mod_rewrite.c(477): [client 151.25.206.200:38368] > 151.25.206.200 - - [www.centrometeo.com/sid#55c3e3673400][rid# > 7f8c8000e9d0/subreq > <http://www.centrometeo.com/sid#55c3e3673400][rid%237f8c8000e9d0/subreq>] > [perdir /home/web/centrometeo.com/] pass through /home/web/ > centrometeo.com/index.php, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913003 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(567): [client 151.25.206.200:38368] > Headers from script 'php.fcgi':, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913097 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(568): [client 151.25.206.200:38368] *Status: > 500 Internal Server Error*, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913130 2016] [core:trace1] [pid 17957:tid > 140241771534080] util_script.c(649): [client 151.25.206.200:38368] *Status > line from script 'php.fcgi': 500 Internal Server Error*, referer: > http://www.centrometeo.com/modelli-numerici/modello-wrf- > nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913162 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(568): [client 151.25.206.200:38368] > X-Powered-By: PHP/5.6.26, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913191 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(568): [client 151.25.206.200:38368] P3P: > CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM", referer: > http://www.centrometeo.com/modelli-numerici/modello-wrf- > nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913218 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(568): [client 151.25.206.200:38368] > Content-Encoding: gzip, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913246 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(568): [client 151.25.206.200:38368] > Vary: Accept-Encoding, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913275 2016] [core:trace4] [pid 17957:tid > 140241771534080] util_script.c(568): [client 151.25.206.200:38368] > Content-type: text/html; charset=UTF-8, referer: > http://www.centrometeo.com/modelli-numerici/modello-wrf- > nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913395 2016] [http:trace3] [pid 17957:tid > 140241771534080] http_filters.c(1006): [client 151.25.206.200:38368] *Response > sent with status 500, headers:*, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913432 2016] [http:trace4] [pid 17957:tid > 140241771534080] http_filters.c(835): [client 151.25.206.200:38368] > X-Powered-By: PHP/5.6.26, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913458 2016] [http:trace4] [pid 17957:tid > 140241771534080] http_filters.c(835): [client 151.25.206.200:38368] > P3P: CP=\\"NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM\\", referer: > http://www.centrometeo.com/modelli-numerici/modello-wrf- > nmm/559-wrf-mslp-6hprec-ita > [Fri Sep 30 07:41:39.913481 2016] [http:trace4] [pid 17957:tid > 140241771534080] http_filters.c(835): [client 151.25.206.200:38368] > Content-Encoding: gzip, referer: http://www.centrometeo.com/ > modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita > [...] > > Note the use of fcgi. Apache is indeed configured with > event/php-fpm/FastCGI, but the same thing happens with "normal" prefork / > php! > Until a few days ago it did not happen, it started after updating the > system (kernel, apache, php, mariadb). > I do not really know what to do. > > Thank you very much. > Fabio. > -- *Daniel Ferradal* IT Specialist email dferradal at gmail.com linkedin es.linkedin.com/in/danielferradal
