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From Sean O'Reilly <s...@secpay.com>
Subject Re: Tomcat session replication/cluster (mod_proxy_ajp)
Date Mon, 26 Jun 2006 10:29:26 GMT
On Fri, 23 Jun 2006 16:43:16 +0100
Pid <p@pidster.com> wrote:

> 
> 
> Sean O'Reilly wrote:
> > On Fri, 23 Jun 2006 09:05:18 -0500
> > Filip Hanik - Dev Lists <devlists@hanik.com> wrote:
> > I am sure it would be easier to use mod_proxy_balancer and
> > mod_proxy_ajp but can't find any documentation anywhere.
> 
> My servers didn't have their clocks synchronised, check that.
> Also try using the most basic cluster config to start with and work up
> to more complex variations.
> 
> There's not much to configure for proxy_ajp / balancer.
> We're running Apache2.2 + Tomcat 5.5.17 + with mod_proxy_ajp &c.
> AJP needs no config, which is nice.
> Balancer also needs very little, see mod_proxy for details.
> The route=TCS1 parameter is the jvmRoute set in the tomcat Engine.
> 
> ### put this in your Apache vhost/conf
> 
> ReWriteEngine     on
> ProxyPreserveHost On
> ProxyRequests     Off
> ProxyVia          Off
> 
> <Proxy balancer://mycluster>
>    BalancerMember ajp://tomcat1:8009 smax=10 loadfactor=10 route=TCS1
>    BalancerMember ajp://tomcat2:8009 smax=10 loadfactor=10 route=TCS2
> </Proxy>
> 
> RewriteRule ^\/(.+)\.jsp(.+)? balancer://mycluster/$1.jsp$2 [P,L]
> 
> ProxyPass /favicon.ico !
> ProxyPass /robots.txt  !
> ProxyPass /images/     !
> ProxyPass /forms/ balancer://mycluster/forms/ \
> maxattempts=1 lbmethod=bytraffic stickysession=JSESSIONID
> 
> 
> 
> 
> > Thanks for the help so far guys.
> > 
> 
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ok here are latest config files

server.xml (cluster configuration)

<Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
                name="cluster"
                debug="10"
                serviceclass="org.apache.catalina.cluster.mcast.McastService"
                mcastAddress="228.0.0.4"
                mcastPort="45564"                 
		mcastFrequency="500"
                mcastDroptime="3000"
                tcpThreadCount="6"
                tcpListenAddress="auto"
                tcpListenPort="4001"
                tcpSelectorTimeout="100"
                printToScreen="false"
                expireSessionsOnShutdown="false"
                useDirtyFlag="true"
                replicationMode="synchronous"/>

<Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"
                   filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>
###################################################################################################
connector.conf

ReWriteEngine   On
ProxyPreserveHost       On
ProxyRequests   Off
ProxyVia        Off

<Proxy balancer://secpay_cluster>
        BalancerMember ajp://localhost:8009 smax=10 loadfactor=1
route=jvm1
        BalancerMember ajp://192.168.4.3:8009 smax=10 loadfactor=1
route=jvm2
        BalancerMember ajp://192.168.4.1:8009 smax=10 loadfactor=1
route=jvm3
</proxy>

RewriteRule ^\/(.+)\.jsp(.+)? balancer://secpay_cluster/$1.jsp$2 [P,L]

ProxyPass /favicon.ico !
ProxyPass /robots.txt  !
ProxyPass /images/     !
ProxyPass /jsp-examples/*       balancer://secpay_cluster/jsp-examples/
maxattempts=1 lbmethod=byrequests nofailover=off
stickysession=JSESSIONID
ProxyPassReverse /jsp-example/* balancer://secpay_cluster/jsp-examples/
maxattempts=1 lbmethod=byrequests nofailover=off
stickysession=JSESSIONID
ProxyPass /servlets-examples/*
balancer://secpay_cluster/servlets-examples/ maxattempts=1
lbmethod=byrequests nofailover=off stickysession=JSESSIONID
ProxyPassReverse /servlets-examples/*
balancer://secpay_cluster/servlets-examples/ maxattempts=1
lbmethod=byrequests nofailover=off stickysession=JSESSIONID

##############################################################################
startup logs from one of the servers

26-Jun-2006 11:13:45 org.apache.catalina.cluster.tcp.SimpleTcpCluster
createDefaultClusterListener
INFO: Add Default ClusterListener at cluster localhost
26-Jun-2006 11:13:45 org.apache.catalina.cluster.tcp.SimpleTcpCluster
createDefaultClusterReceiver
INFO: Add Default ClusterReceiver at cluster localhost
26-Jun-2006 11:13:45 org.apache.catalina.cluster.tcp.SimpleTcpCluster
createDefaultClusterSender
INFO: Add Default ClusterSender at cluster localhost
26-Jun-2006 11:13:45
org.apache.catalina.cluster.tcp.SocketReplicationListener
createServerSocket
INFO: Open Socket at [127.0.0.1:8015]
26-Jun-2006 11:13:45
org.apache.catalina.cluster.tcp.ReplicationTransmitter start
INFO: Start ClusterSender at cluster
Standalone:type=Cluster,host=localhost with name
Standalone:type=ClusterSender,host=localhost
26-Jun-2006 11:13:45 org.apache.catalina.cluster.tcp.SimpleTcpCluster
createDefaultMembershipService
INFO: Add Default Membership Service at cluster localhost
26-Jun-2006 11:13:45 org.apache.catalina.cluster.mcast.McastService
start
INFO: Sleeping for 4000 milliseconds to establish cluster membership
26-Jun-2006 11:13:46 org.apache.catalina.cluster.tcp.SimpleTcpCluster
memberAdded
INFO: Replication member
added:org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.4.121:8015,catalina,192.168.4.121,8015,
alive=154886]
26-Jun-2006 11:13:46
org.apache.catalina.cluster.tcp.FastAsyncSocketSender checkThread
INFO: Create sender [/192.168.4.121:8,015] queue thread to tcp
background replication
26-Jun-2006 11:13:49 org.apache.catalina.cluster.mcast.McastService
registerMBean
INFO: membership mbean registered
(Standalone:type=ClusterMembership,host=localhost)
26-Jun-2006 11:13:51 org.apache.catalina.core.ApplicationContext log
INFO: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain:
[org.apache.webapp.balancer.RuleChain:
[org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL:
http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param
name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule:
Redirect URL: http://jakarta.apache.org]]
26-Jun-2006 11:13:51 org.apache.catalina.cluster.session.DeltaManager
start
INFO: Register manager /jsp-examples to cluster element Host with name
localhost
26-Jun-2006 11:13:51 org.apache.catalina.cluster.session.DeltaManager
start
INFO: Starting clustering manager at /jsp-examples
26-Jun-2006 11:13:51 org.apache.catalina.cluster.session.DeltaManager
getAllClusterSessions
WARNING: Manager [/jsp-examples], requesting session state from
org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.4.121:8015,catalina,192.168.4.121,8015,
alive=159907]. This operation will timeout if no session state has been received within 60
seconds.
26-Jun-2006 11:14:51 org.apache.catalina.cluster.session.DeltaManager
waitForSendAllSessions
SEVERE: Manager [/jsp-examples]: No session state send at 26/06/06
11:13 received, timing out after 60,137 ms.
26-Jun-2006 11:14:51 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
26-Jun-2006 11:14:51 org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
26-Jun-2006 11:14:52 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
26-Jun-2006 11:14:52 org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
26-Jun-2006 11:14:52 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
26-Jun-2006 11:14:52 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/144  config=null
26-Jun-2006 11:14:53 org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
26-Jun-2006 11:14:53 org.apache.catalina.startup.Catalina start
INFO: Server startup in 68534 ms
26-Jun-2006 11:19:57 org.apache.catalina.cluster.tcp.SimpleTcpCluster
memberDisappeared
INFO: Received member
disappeared:org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.4.121:8015,catalina,192.168.4.121,8015,
alive=495495]
26-Jun-2006 11:19:57 org.apache.catalina.cluster.util.FastQueue remove
INFO: FastQueue.remove: Remove aborted although queue enabled


Still having some problems with load balancing and state replication
neither of which appear to be working. If i shutdown tomcat on the
main server i can still get to the application directory from one of
the other servers but get a 503 error if i try to run  any of the
applications ?? 




-- 
Sean O'Reilly
Systems Administrator
SECPay Ltd

http://www.secpay.com

s.oreilly@secpay.com

Mobile 07917 463906

DDI 01732 300212

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