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From Miguel González Castaños <miguel_3_gonza...@yahoo.es>
Subject Re: redirecting people to maintenance mode
Date Wed, 22 Aug 2012 09:04:41 GMT
On 21/08/2012 17:00, Christopher Schultz wrote:
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> Miguel,
>
> On 8/21/12 6:25 AM, Miguel González Castaños wrote:
>> Dear all,
>>
>> I have a Tomcat web server. From time to time, I need to do some
>> maintenance and want people not to interact with the Tomcat server
>> while I'm doing it. The key thing here is that the Tomcat server is
>> up and running. This is what I want to achieve:
>>
>> - I want all people to be redirected from 80/443 port at server1 to
>> a different URL http://server2/maintenance.html except my IP
>> address (so I can check Tomcat myself).
>>
>> - If possible, I want this to be transparent to the user, so they
>> get a http redirect showing the server1 in the client's browser,
>> not server2 (but this is not that important).
>>
>> I assume I can use iptables to redirect people to a different web
>> server, but how can I know that I need to redirect them to the
>> maintenance.html if that server is serving other web pages too?
> I don't know if you want to add this kind of complication to your
> environment, but this is pretty much what mod_jk was built for:
> distributing requests to one or more back-end Tomcat servers.
>
> With mod_jk's management interface, you can take (load-balanced)
> workers out of a pool, upgrade them, then add them back to the pool.
> Before you add them back, you can always access them directly if you
> have set up an HTTP <Connector> and you can feel free to use any
> technique (iptables, bind to 127.0.0.1, etc.) to prevent direct access
> to the HTTP port from normal users.
>
> The use of Apache httpd out in front of your app server(s) also means
> that you can detect error conditions in the Tomcat instance (like it's
> crashed or whatever) and give a semi-nice error message instead of a
> connection failure.
>
> This is one of those situations where using Apache httpd out in front
> of Tomcat makes some sense: not for performance, but for availability.
> See Mladen's article with explains some of the why, what and how of
> setting up a mod_jk-based cluster:
> http://people.apache.org/~mturk/docs/article/ftwai.html
It makes sense. I will give it a thought. Unfortunately until we migrate 
to a bigger server, I'm not sure the overhead of Apache is too much. 
Although I know Apache is faster for static content.

Many thanks for your thoughts

Miguel




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