On 18 February 2011 21:42, Fran Boon <francisb...@gmail.com> wrote: > On 18 February 2011 20:19, Filip Hanik - Dev Lists <devli...@hanik.com> wrote: >> Simplest to try first is the disablereuse flag >> http://httpd.apache.org/docs/2.2/mod/mod_proxy.html >> disablereuse On >> and if that solves the problem, you know that the problem with not enough >> threads on tomcat. >> (Could be from stale connections that are still holding a thread) > Awesome - that makes it at least 10x more reliable! > Still not perfect, but a massive improvement.
Actually this seems to have been a relatively temporary improvement. However I have found the underlying cause! mod_evasive had been installed to protect against DoS attacks & it seems that this is what gives the error with too many simultaneous requests! Removing this & all works reliably - big phew! > Any more suggestions on what I can do to clear the last errors & > generally how to approach this configuration? > (Apache & Tomcat on the same physical server. Load isn't terribly high > right now, but I'd like it to be able to scale. There is 2Gb RAM > available (although this is shared with PostgreSQL which is tuned to > think it has 1024 available for it) This would still be welcomed - I've got to the stage of realising the wealth of options available to me, but still not sure exactly what I should do ;) I guess trial & error is the best bet & since my load levels are so low, it's quite likely that default configs should be fine. Since I'm only running a single Tomcat, there's no big reason to run Worker MPM, is there? Many thanks, Fran. >> Filip >> >> On 02/18/2011 12:24 PM, Fran Boon wrote: >>> >>> httpd error log: >>> client denied by server configuration: >>> proxy:ajp://localhost:8009/geoserver/gwc/service/wms >>> >>> This happens under 'high' load only: 1st few requests of a batch are >>> answered but then they start dying - there are no bad URLs here. >>> >>> httpd snippet: >>> ProxyPreserveHost on >>> RewriteRule ^/geoserver/(.*)$ ajp://localhost:8009/geoserver/$1 [P] >>> ProxyPassReverse /geoserver ajp://localhost:8009/geoserver/ >>> >>> <LocationMatch "^(/[\w_]*/geoserver/.*)"> >>> Order Allow,Deny >>> Allow from all >>> </LocationMatch> >>> >>> I have tried these configuration options without any apparent difference: >>> <Proxy ajp://localhost:8009> >>> ProxySet keepalive=On timeout=15 ttl=60 >>> </Proxy> >>> >>> Happens even with 'Allow from all' in proxy.conf (in fact nothing in >>> that file makes any difference, presumably as it only affects Forward >>> proxies. >>> >>> I have tried with both the default prefork MPM& also the worker MPM. >>> >>> Back-end is GeoServer in Tomcat 6 (exactly same thing happened with >>> 5.5) on Debian Squeeze 64-bit& current Sun JVM. >>> Nothing in the logs at the back-end, though, seems to be a problem >>> with the Connector. >>> Same thing whether or not using the 'APR based Apache Tomcat Native >>> library 1.1.20' or not. >>> I tried putting in a connectionTimeout into server.xml, but it makes >>> no difference: >>> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" >>> connectionTimeout="60000" /> >>> >>> Same with setting the minSpareThreads="32" maxThreads="256" >>> to match those in apache.conf >>> <IfModule mpm_worker_module> >>> StartServers 2 >>> MaxClients 256 >>> MinSpareThreads 32 >>> MaxSpareThreads 128 >>> ThreadsPerChild 32 >>> MaxRequestsPerChild 1024 >>> </IfModule> >>> >>> None of these tuning options seem to make much difference. >>> >>> Only web posts I've seen are the on/off conditions rather than erratic >>> ones. >>> >>> Many thanks, for any suggestions :) >>> >>> Fran. >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >>> For additional commands, e-mail: users-h...@tomcat.apache.org >>> >>> >>> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
