Hello Team, I have configured apache to load balanced six tomcat instances in the backend using mod_proxy_balance and mod_proxy_ajp modules.
I am frequently getting service temporary unavailable message and following error in the apache error logs. [Mon Feb 06 09:07:28 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) [Mon Feb 06 09:07:32 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) [Mon Feb 06 09:07:36 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) [Mon Feb 06 09:07:37 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) [Mon Feb 06 09:07:42 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) [Mon Feb 06 09:07:45 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) [Mon Feb 06 09:08:02 2012] [error] proxy: BALANCER: (balancer://cluster). All workers are in error state for route (marsprod_rmiserver_3) I am using following version of apache and tomcat. Apache version :- Apache/2.2.16 Tomcat :- 6.0.26 Jdk :-1.6.0_24 Below is the configuration of my apache and tomcat. # Port 80 Listen server_name:80 <VirtualHost _default_:80> ServerName server_name ServerAlias server_name ServerAlias server_name <Directory /eMatrix> Order deny,allow Deny from all Allow from 153.88.251.174 153.88.251.160 153.88.251.165 153.88.251.170 153.88.251.212 153.88.251.199 </Directory> Timeout 1800 ProxyTimeout 1800 ProxyRequests Off ProxyPass /eMatrix balancer://cluster stickysession=JSESSIONID|jsessionid nofailover=On #ProxyPass /eMatrix balancer://cluster stickysession=JSESSIONID nofailover=On ProxyPreserveHost On ProxyPass /eMatrix ajp://server_name:8009/eMatrix ProxyPass /eMatrix ajp://server_name:8010/eMatrix ProxyPass /eMatrix ajp://server_name:8011/eMatrix ProxyPass /eMatrix ajp://server_name:9009/eMatrix ProxyPass /eMatrix ajp://server_name:9010/eMatrix ProxyPass /eMatrix ajp://server_name:9011/eMatrix ProxyPassReverse /eMatrix ajp://server_name:8009/eMatrix ProxyPassReverse /eMatrix ajp://server_name:8010/eMatrix ProxyPassReverse /eMatrix ajp://server_name:8011/eMatrix ProxyPassReverse /eMatrix ajp://server_name:9009/eMatrix ProxyPassReverse /eMatrix ajp://server_name:9010/eMatrix ProxyPassReverse /eMatrix ajp://server_name:9011/eMatrix <Proxy balancer://cluster> BalancerMember ajp://server_name:8009/eMatrix route=marsprod_rmiserver_1 loadfactor=33 retry=60 BalancerMember ajp://server_name:8010/eMatrix route=marsprod_rmiserver_2 loadfactor=33 retry=60 BalancerMember ajp://server_name:8011/eMatrix route=marsprod_rmiserver_3 loadfactor=33 retry=60 BalancerMember ajp://server_name:9009/eMatrix route=marsprod_rmiserver_4 loadfactor=33 retry=60 BalancerMember ajp://server_name:9010/eMatrix route=marsprod_rmiserver_5 loadfactor=33 retry=60 #load balancing performed based on number of user requests #ProxySet lbmethod=byrequests # Report server is for Report purpose only so balancing is required now. BalancerMember ajp://server_name:9011/eMatrix route=marsprod_rmiserver_6 loadfactor=33 retry=60 ProxySet lbmethod=byrequests </Proxy> #Status page for balancer <Location /balancer> SetHandler balancer-manager Order Deny,Allow Deny from all Allow from all </Location> ProxyStatus On <Location /status> SetHandler server-status Order Deny,Allow Deny from all Allow from all </Location> ErrorLog /opt/web/apache/app/mxora/logs/error.log </VirtualHost> Tomcat Configuration Server.xml <!-- for Native tomcat setup--> <Connector port="8082" protocol="org.apache.coyote.http11.Http11AprProtocol" maxHttpHeaderSize="8192" maxThreads="60" maxPostSize="0" enableLookups="false" redirectPort="8443" acceptCount="150" compression="on" connectionTimeout="60000" disableUploadTimeout="true" URIEncoding="UTF-8"/> <!-- Define an AJP 1.3 Connector on port 9084 --> <Connector port="8010" protocol="AJP/1.3" redirectPort="8443" maxThreads="60" enableLookups="false" maxPostSize="0" connectionTimeout="60000" URIEncoding="UTF-8"/> Kindly help me to trobleshoot the issue.