I'm setting up a 2-node Tomcat cluster with jk_mod doing the
loadbalancing. The loadbalancing went without a hitch, or at least
without hitches that maillist archives couldn't untie. But now I'd like
to have in-memory session replication between the two tomcat nodes. I
uncommented the cluster element in the server.xml file on each node, but
clustering didn't magically happen as I hoped it would: no replication
takes place.
I'm using a page in the jsp-examples webapp that sets a simple attribute
on the session -- session.setAttribute(hello, howdy);
When starting up Tomcat on each node, I get these log entries:
Apr 27, 2005 12:30:28 PM
org.apache.catalina.cluster.session.DeltaManager start
INFO: Starting clustering manager at /jsp-examples
Apr 27, 2005 12:30:28 PM
org.apache.catalina.cluster.session.DeltaManager start
INFO: Manager [/jsp-examples]: skipping state transfer. No members
active in cluster group.
I get this on both nodes, even if I start one node, create a session,
then start node 2.
Multicast is enabled: at least, when I ping 224.0.0.1, I get responses
from all my interfaces. Do I need to do something to join 228.0.0.4, or
is that a programmatic thing?
I've pasted my workers.properties below (minus comments), and the
cluster element from my server.xml. I've tried adding a name
attribute to the cluster element and to each of its child elements in
turn, without effect.
TIA!
Rod
# workers.properties -
workers.java_home=/usr/java/jre1.5.0_02
ps=/
#
#-- ADVANCED MODE
#-
#
worker.list=realserver1, realserver2, realserver3, realserver4,
loadbalancer, jkstatus
worker.realserver1.port=8009
worker.realserver1.host=localhost
worker.realserver1.type=ajp13
worker.realserver1.lbfactor=100
worker.realserver2.port=8010
worker.realserver2.host=localhost
worker.realserver2.type=ajp13
worker.realserver2.lbfactor=100
worker.realserver3.port=8009
worker.realserver3.host=marmot
worker.realserver3.type=ajp13
worker.realserver3.lbfactor=100
worker.realserver4.port=8010
worker.realserver4.host=marmot
worker.realserver4.type=ajp13
worker.realserver4.lbfactor=100
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=realserver1, realserver2,
realserver3, realserver4
worker.jkstatus.type=status
# end workers.properties
!-- server.xml cluster element --
Cluster className=org.apache.catalina.cluster.tcp.SimpleTcpCluster
managerClassName=org.apache.catalina.cluster.session.DeltaManager
expireSessionsOnShutdown=false
useDirtyFlag=true
notifyListenersOnReplication=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=auto
tcpListenPort=4001
tcpSelectorTimeout=100
tcpThreadCount=6/
Sender
className=org.apache.catalina.cluster.tcp.ReplicationTransmitter
replicationMode=pooled
ackTimeout=15000/
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/
/Cluster
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