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)
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.
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