the disappeared message appears 3seconds after the member added message.
3 seconds is the timeout you have set, ie, if no multicast heartbeat is
received after 3 seconds, consider the member dead.
so it seems like multicasting is not working properly on your system.
Filip
Andrew R Feller wrote:
Good morning everyone,
I have been trying to get Tomcat clustering between two Tomcat instances
set up, but I have run into some issues. After opening the necessary
ports in the firewall, routing the broadcast messages to the correct
network interface (eth0), and setting up server.xml with the necessary
membership information, I get the following from my Tomcat logs:
2007-07-03 09:16:37,247 INFO
[org.apache.catalina.cluster.tcp.SimpleTcpCluster] - Replication member
added:org.apache.catalina.cluster.mcast.McastMember[tcp://130.39.184.173
:4001,catalina,130.39.184.173,4001, alive=30318]
2007-07-03 09:16:37,256 DEBUG
[org.apache.catalina.cluster.tcp.DataSender] - Create sender
[/130.39.184.173:4,001]
2007-07-03 09:16:40,724 INFO
[org.apache.catalina.cluster.tcp.SimpleTcpCluster] - Received member
disappeared:org.apache.catalina.cluster.mcast.McastMember[tcp://130.39.1
84.173:4001,catalina,130.39.184.173,4001, alive=30318]
What could be the cause of cluster members disappearing immediately
after being added? Am I missing anything necessary for setting up
clustering / session replication? Relative information about the server
is below.
Thank you,
Andrew
Tomcat: 5.5.23
Server: RHEL 5
Server.xml:
<Cluster
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
expireSessionsOnShutdown="false"
useDirtyFlag="true">
<Membership
className="org.apache.catalina.cluster.mcast.McastService"
mcastAddr="239.39.184.173"
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="synchronous" />
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;
" />
<ClusterListener
className="org.apache.catalina.cluster.session.ClusterSessionListener"
/>
</Cluster>
IP table rules:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport
4001 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 45564 -d 239.39.184.173 -j
ACCEPT
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