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Luca,

On 7/19/2010 3:07 AM, Luca Gervasi wrote:
> I use httpd + mod_jk as frontend to load balance among all the backends
> (lb worker).

Okay, that will simplify switching backends at will from a client.

> The backends use the BackupManager to achieve clusterization enclosed
> in the <Engine> tag.

Ok. Have you tried DeltaManager (the default)?

>> Also, make sure that you have logging.properties set up in a sane way,
>> and that you can get debugging output from at least one component.
> 
> I don't have a logging.properties file. All the settings are "default".

Those two statements are not compatible: Tomcat ships with a
conf/logging.properties file. Have you disabled it?

At the very least, you ought to be able to force your way into a backend
server with a URL like this:

http://host/context;jsessionid=ABCDEF.node1

(where "node1" is your jvmRoute set in your mod_jk configuration and in
your <Connector> on the backend).

Once you've created a session on one node and stuffed some interesting
things into it, then switch nodes by changing your URL:

http://host/context;jsessionid=ABCDEF.node2

If your session still works, then the cluster is working. If your
session isn't there, or the expected attributes are not present, they
there is either a misconfiguration or some kind of connectivity issue.

Speaking of configuration, would you care to post your cluster
configuration?

- -chris
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