- Original Message -
From: Gabriele Faelli gabriele.fae...@gmail.com
To: users@tomcat.apache.org
Cc:
Sent: Wednesday, October 5, 2011 1:17 AM
Subject: Re: problem with session replication in tomcat 5.5.23
Really any idea?
Il giorno 04/ott/2011 19:13, Gabriele Faelli
gabriele.fae...@gmail.com
ha scritto:
Hi all,
I'm running tomcat 5.5.23 on two RHEL 5.6.
I'm having big trouble making the session replication working across
these
two nodes.
I configured a cluster and it looks like working: each node discovers the
other one, I can see in the logs every received and transmitted ping.
Well, when I create a session in the logs there are no mention of sessions
being replicated and/or errors encounter while trying.
The applications running on tomcat have the distributable/ entry in
their
web.xml and this is the cluster config part of the server.xml:
Cluster
className=org.apache.catalina.cluster.tcp.SimpleTcpCluster
defaultMode=true
managerClassName=org.apache.catalina.cluster.session.DeltaManager
manager.expireSessionsOnShutdown=false
manager.useDirtyFlag=false
manager.notifyListenersOnReplication=true
manager.notifySessionListenersOnReplication=true
manager.sendAllSessions=true
Membership
className=org.apache.catalina.cluster.mcast.McastService
mcastAddr=228.0.0.4
mcastPort=45564
mcastFrequency=500
mcastDropTime=3000/
Receiver
className=org.apache.catalina.cluster.tcp.ReplicationListener
tcpListenAddress=192.168.199.101
tcpListenPort=4001
tcpSelectorTimeout=100
tcpThreadCount=6/
Sender
className=org.apache.catalina.cluster.tcp.ReplicationTransmitter
replicationMode=synchronous
ackTimeout=15000
waitForAck=true
autoConnect=true/
Valve
className=org.apache.catalina.cluster.tcp.ReplicationValve
filter=.*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;/
Deployer
className=org.apache.catalina.cluster.deploy.FarmWarDeployer
tempDir=/tmp/war-temp/
deployDir=/tmp/war-deploy/
watchDir=/tmp/war-listen/
watchEnabled=false/
ClusterListener
className=org.apache.catalina.cluster.session.ClusterSessionListener/
/Cluster
Any Idea? Where I'm wrong? I did something stupid for sure :)
I tried every configuration, suggest... well everything I found on the
official an unofficial documentation... I'm quite frustated :P
Thanks in advance
G.
I'm by no means a clustering expert, and I've only run a 5.5.x (5.5.33) cluster
on my local machine (Fedora 15). I was going to work on improving the
documentation (and my understanding), but since EOL for the 5.5.x series is
less than one year out that's fallen lower on my things to do list.
A few things to check:
1. Make sure all your session objects implement java.io.Serializable
2. You have distributable/ as the first line after webapp in your web.xml
file
3. Apparently (from the Tomcat documentation) when you override any of the
defaults you
have to specify everything.
This has tripped me up in the past. I noticed for example that your
configuration appears to be missing a ClusterListener. Try adding the following
line to your cluster configuration after your other ClusterListener.
ClusterListener
className=org.apache.catalina.cluster.session.JvmRouteSessionIDBinderListener
/
4. Make sure that each Tomcat has a unique jvmRoute attribute on the Engine
element
5. Make sure your firewall is not blocking new connections on your tcpListenPort
6. Make sure that you're set up for multicasting on the proper interface (which
it
sounds like you do)
So ifconfig interface-name should show in part: UP BROADCAST RUNNING MULTICAST
So ip route list should show something like: multicast 224.0.0.0/4 dev eth0
scope link
7. Run something like Wireshark or tcpdump and watch for traffic on the
tcpListenPort
Items 3 and 4 are for load balancing with AJP (think mod_ajp and Apache HTTPD),
so I don't know if it's necessary.
I'm not sure how the FarmDeployer works. I have mine set up so it functions,
but there doesn't seem to be any documentation. The javadoc doesn't seem to be
internally consistent (I know, patches welcome). I've set my FarmDeployer up as
follows:
Admin (or source) node:
Deployer className=org.apache.catalina.cluster.deploy.FarmWarDeployer
tempDir=${catalina.base}/temp-dir/
deployDir=${catalina.base}/webapps/
watchDir=${catalina.base}/watch-dir/
watchEnabled=true/
All other (client) nodes:
Deployer className=org.apache.catalina.cluster.deploy.FarmWarDeployer
tempDir=${catalina.base}/temp-dir/
deployDir=${catalina.base}/webapps/
watchDir=${catalina.base}/watch-dir/
watchEnabled=false/
This seems to work (auto-deploy, etc.), except that when I restart the cluster
all of the applications in watchDir are deleted from deployDir and then
redeployed.
Finally, you can get some more logging information by modifying
$CATALINA_HOME
