Hello,
We have environment with Apache (2.2.0) + Tomcat (5.5.17) connected via
mod_jk (1.2.18). Further tomcat makes some queries to databese through
Tuxedo services (BEA).
Everything works fine until heavy load when something stops responding
(Service not available).
We think it is tomcat or mod_jk. It occures when "Max busy connections" on
mod_jk status manager shows about 200. Mod_jk is in error status then.
So we decided to use mod_jk load balancing feature and we installed another
instance of tomcat (on the same machine).
Now service is available even under heavy load but we are losing sessions.
Of course sticky_session is set to "true".
Below I paste our config files. Please help if you only can.
Best regards
Artur
###Jk status for one day:
Name Type jvmRoute Host Addr Stat D F M
V Acc Err Wr Rd Busy Max RR Cd
worker2 ajp13 worker2 localhost:8009 127.0.0.1:8009 OK 0 1
1 2144 824825 512
480M 5.8G 6 138 worker3
###httpd.mpm section:
# worker MPM
# StartServers: initial number of server processes to start
# MaxClients: maximum number of simultaneous client connections
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule mpm_worker_module>
StartServers 5
MaxClients 448
MinSpareThreads 5
MaxSpareThreads 25
ThreadsPerChild 7
MaxRequestsPerChild 0
</IfModule>
###workers.properties:
# Define 3 workers, 2 real workers using ajp13 and the last one being a
loadbalancing worker
worker.list=worker1,jkstatus
# Set properties for worker2 (ajp13)
worker.worker2.type=ajp13
worker.worker2.host=localhost
worker.worker2.port=8009
worker.worker2.lbfactor=1
worker.worker2.connection_pool_size=7
worker.worker2.connection_pool_timeout=300
worker.worker2.socket_timeout=60
# Set properties for worker4 (lb) which use worker1 and worker2
worker.worker3.type=ajp13
worker.worker3.host=localhost
worker.worker3.port=8019
worker.worker3.lbfactor=1
worker.worker3.connection_pool_size=7
worker.worker3.connection_pool_timeout=300
worker.worker3.socket_timeout=60
# Define a 'jkstatus' worker using status
worker.jkstatus.type=status
worker.worker1.type=lb
worker.worker1.sticky_session=true
worker.worker1.method=R
worker.worker1.balance_workers=worker2,worker3
###server1.xml - connector section:
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009"
enableLookups="false" redirectPort="8443" protocol="AJP/1.3"
/>
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker2">
###server2.xml - connector section
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8019"
enableLookups="false" redirectPort="8443" protocol="AJP/1.3"
/>
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker3">
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