[Tip] EhCache and Ubuntu (Hardy 8.04)

Ray Augé
Ray Augé
Less Than a Minute Read

If you are or you have tried installing a Liferay on a cluster of Ubuntu machines and are/were having problems with the ehCache, do this check:

]$ ping `hostname`

If it responds using an address on the loopback device, there's your problem.

By default, Ubuntu defines the machine's hostname on the loopback address (127.0.1.1), and since ehCache uses:

InetAddress.getLocalHost().getHostAddress()

to resolve the address used in association with the RMICachePeers it creates, these peers will have addresses of 127.0.1.1:port which will render them unreachable to other peers on the network.

Here is a successful test:

rotty@liferay-laptop:~$ ping `hostname`
PING liferay-laptop (192.168.0.243) 56(84) bytes of data.
64 bytes from liferay-laptop (192.168.0.243): icmp_seq=1 ttl=64 time=0.046 ms
64 bytes from liferay-laptop (192.168.0.243): icmp_seq=2 ttl=64 time=0.056 ms
64 bytes from liferay-laptop (192.168.0.243): icmp_seq=3 ttl=64 time=0.055 ms

Note that the address is one on the private subnet where the rest of the cluster nodes can see it.

FYI!

Page Comments
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Shepherd Ching
17 Years Ago
This problem has puzzled me for a long time.
Now I understand what's wrong with ehcache at my Ubuntu 7.10. /etc/hosts

You're bravo, it is not easy to solve it.
Thank you very much for your help.

C'est dur. Tu es vraiment capable.
Tu es trè gentil! Merci de votre aide!
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