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From "Frank W. Zammetti" <fzli...@omnytex.com>
Subject RE: How can I take a webapp "temporarily out of service" using mod_jk?
Date Mon, 23 Jan 2006 22:08:08 GMT
Ah, sorry, didn't get that.  I was suggesting servlet filters.  I don't
frankly know anything about Apache filters... if it's like a servlet
filter but before the request hits the app server, it sounds like it could
do the trick in the same basic way though.

-- 
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM: fzammetti
Yahoo: fzammetti
MSN: fzammetti@hotmail.com

On Mon, January 23, 2006 5:06 pm, Prout John - jprout said:
> The problem with this solution is that the webapp really is out of
> service and unable to serve any pages - it's Apache that will have to
> serve the "Out of service" page; that's why I'm looking at mod_jk.
>
> Or were you thinking of an Apache filter, rather than a servlets filter?
> I don't know much about Apache filters
>
> Thanks - John
>
> -----Original Message-----
> From: Frank W. Zammetti [mailto:fzlists@omnytex.com]
> Sent: Monday, January 23, 2006 2:00 PM
> To: Tomcat Users List
> Cc: users@tomcat.apache.org
> Subject: Re: How can I take a webapp "temporarily out of service" using
> mod_jk?
>
> Hi John,
>
> A filter should do the trick for you.  Have it interrogate some value
> somewhere (context value? static class? database?) and when it sees a
> particular value, redirect to your out of service page.
>
> Since your in a cluster, you have the problem of replicating this "out
> of
> service" flag to all the nodes... a database would be the obvious
> answer,
> but clearly that has performance implications.  You may need some
> special
> URL in your app that sets the flag, properly secured of course, and make
> yourself a quick little page that fires it to all nodes.
>
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> http://www.omnytex.com
> AIM: fzammetti
> Yahoo: fzammetti
> MSN: fzammetti@hotmail.com
>
> On Mon, January 23, 2006 4:56 pm, Prout John - jprout said:
>> Hi
>>
>>
>>
>> I am running a JBoss cluster, using tomcat as the Servlet engine.
> Apache
>> and mod_jk provide load-balancing of requests over the machines in the
>> cluster
>>
>>
>>
>> I need to be able to replace all the URLs in the webapp with a
>> "Temporarily out of service" page during maintenance, and I need to do
>> this without making any permanent Apache configuration changes and
>> without restarting Apache (Operations is very reluctant to restart
>> Apache).
>>
>>
>>
>> Does anyone know a way to do this?
>>
>>
>>
>> I think there may be a way to use the controls on the mod_jk status
> page
>> to redirect all requests for a webapp to a different URL ( the "Route
>> Redirect" input) but this is probably wishful thinking - even if does
>> allow me to redirect requests, it would probably apply to all the
>> webapps in the cluster, which wouldn't meet the requirement. The
> status
>> page teases me by listing all the JkMounts and JkUnmounts, but doesn't
>> allow me to change them; adding a JkUnmount dynamically would be a
> good
>> solution.
>>
>>
>>
>> Any Ideas?
>>
>>
>>
>> John
>>
>>
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