A Tomcat 8 server has been serving as a reverse proxy behind apache httpd on CentOS 7. Tomcat has had three services running, each with an ajp connection to apache. But when I add a fourth service with its own fourth ajp connection, apache stops responding altogether. How can I assign a fourth ajp connection?
/opt/tomcat/conf/server.xml is:
<?xml version='1.0' encoding='utf-8'?>
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.startup.VersionLoggerListener" />
<Listener className="org.apache.coyote.ajp.AjpProtocol" SSLEngine="on" />
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<GlobalNamingResources>
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<Service name="Catalina">
<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" connectionTimeout="10000" keepAliveTimeout="10000" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
<Service name="Upload">
<Connector port="8081" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8444" />
<Connector port="8010" protocol="AJP/1.3" redirectPort="8444" connectionTimeout="10000" keepAliveTimeout="10000" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps_upload" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
<Service name="Public">
<Connector port="8082" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8445" />
<Connector port="8011" protocol="AJP/1.3" redirectPort="8445" connectionTimeout="10000" keepAliveTimeout="10000" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps_public" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
<Service name="domain3">
<Connector port="8083" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8446" />
<Connector port="8012" protocol="AJP/1.3" redirectPort="8446" connectionTimeout="10000" keepAliveTimeout="10000" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps_domain3" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
<Service name="domain4">
<Connector port="8084" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8447" />
<Connector port="8013" protocol="AJP/1.3" redirectPort="8447" connectionTimeout="10000" keepAliveTimeout="10000" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps_domain4" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
</Server>
I tried adding the following inside the Public service above instead of adding a fourth service, but I am getting the same error:
<!-- The following host is from: https://stackoverflow.com/questions/10704833/tomcat-and-multiple-domains-applications
<Host name="domain4.com" appBase="webapps_domain4" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="domain4_access_log." suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
-->
The Apache logs are:
[Fri Oct 30 18:14:05.197127 2015] [proxy:error] [pid 25060] (111)Connection refused: AH00957: AJP: attempt to connect to SERVER.ip.addr:8011 (SERVER.ip.addr) fail$
[Fri Oct 30 18:14:05.197220 2015] [proxy:error] [pid 25060] AH00959: ap_proxy_connect_backend disabling worker for (SERVER.ip.addr) for 60s
[Fri Oct 30 18:14:05.197238 2015] [proxy_ajp:error] [pid 25060] [client remote.CLIENT.ip:54548] AH00896: failed to make connection to backend: SERVER.ip.addr
I read this other posting and this second other posting, but they did not answer my question.
Also, the httpd.conf has not changed, so I am omitting it for now to stay on topic as a java tomcat question.
