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Preface

This page discusses cluster- and clustering-related questions. Please make sure to read the Clustering HowTo page in the main Tomcat documentation bundle as well.

Questions

1. Can I configure a cluster at the Engine level?
2. Show me a simple cluster configuration example.
3. How do I turn on transport logging?
4. How do I use JMX to monitor the cluster?
5. Can I pause the message sending?
6. Can I add more senders (pooled mode)?
7. What happens when I pull the network cable?
8. On my windows laptop without network my cluster doesn't work.
9. The cluster doesn't work under Linux with two nodes on two boxes.
10. I get "localhost" rather than "eth0" or another interface when using tcpListenAddress="auto".

Answers

...

• Is your network interface enabled for multicast? ifconfig eth0 MULTICAST
• Exists a multicast route to your network interface? route add -host 228.0.0.4 dev eth0
• Is your firewall active? Then check that multicast port is on your UDP open list and the receiver TCP port is also for both machines open!

Change /etc/hosts so that the localhost domain resolves to the actual IP address of the NIC, eth0. Please see Bugzilla for more.

CategoryFAQ