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Posted to users@tomcat.apache.org by Luca Cicale <in...@alsoftware.it> on 2008/08/12 23:32:52 UTC
Re: [programmazione] Re: Tomcat failover
Answering your question:
assuming you have a apache web server proxing the first tomcat with mod_jk
(so mod_jk help),
you shuold have a thread in your second tomcat which interrogate a servlet
in the first tomcat and if the answer fails this thread should reconfigure
the worker (the mod_jk) so that apache web server redirect the requests to
the second tomcat.
Honestly it doesn't seems to me to be a solid solution (what about the
second tomcat crashes too? what about the sessions in the first tomcat?).
A better solution could be clustering:
http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html
Also give a try to terracotta to keep save your sessions.
In this case you could also have a typical load balanced cluster with net
balancer.
Regards
Luca Cicale
--------------------------------------------------
From: "Ofer Kalisky" <ka...@sendm.biz>
Sent: Tuesday, August 12, 2008 8:30 AM
To: "Tomcat Users List" <us...@tomcat.apache.org>
Subject: [programmazione] Re: Tomcat failover
> Is there a reason why no one is answering this?
> ----- Original Message -----
> From: Ofer Kalisky
> To: Tomcat Users List
> Sent: Monday, August 11, 2008 3:26 PM
> Subject: Tomcat failover
>
>
> Hi,
>
> I have a Tomcat that has a thread that reads entries from a DB and
> handles them. In each cycle, it reads all the entries (to a certain
> limit). I would like to set up a configuration that has a failover Tomcat,
> that when the first one crashes the second starts to read from the same DB
> (or a replicated, doesn't matter) and handle entries.
> I wouldn't want the second Tomcat to read from the DB, because it would
> harm the operation of the first when the first is up. I would like it to
> start working only when the first is down...
>
> How can I know in the second Tomcat that the first have crashed? can
> mod_jk help?
>
> Thanks.
>
>
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