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From Christian Mittendorf <>
Subject Re: Howto deploy a new version of my webapp without disturbing the customer?
Date Fri, 01 Oct 2004 14:36:43 GMT

It would be really great if we could work out a solution that does
the job like the WebObjects Monitor application. Perhaps some kind
of howto documentation giving you a step-by-step guide to the setup
and usage.

There seems to be no Wiki for the Tomcat project page. Is there a
tomcat wiki where we could collect information?


P.S. Where can I find more information about the balancer?

Am 01.10.2004 um 14:52 schrieb Shapira, Yoav:

> Hi,
>> You are really lucky not to offer your service to thousands of
>> customers. From what I can see in the sales figures, those customers
>> never sleep! And so do the product managers: the best downtime is no
>> downtime :-) Thus I want to keep the version cycle as small as
>> possible.
> Yes, it's true that customers/users never sleep.
> I want to offer an alternative approach here.  This scenario is one 
> that
> I had in mind when contributing the balancer app to Tomcat.  Using the
> balancer app to address this issue can result in zero down time.  
> Here's
> the setup:
> Initial:
> - Tomcat server 1 with your app v1.0
> - Tomcat server 2 with your app v1.0 turned off
> - Tomcat front-end running only balancer (so this is a tiny, fast,
> Tomcat installation consuming almost no resources), which redirects
> requests for your app to Tomcat server 1.
> Now v1.1 of your app is ready, here's what you do:
> - Turn on Tomcat server 2, which has your app v1.0 still
> - Modify the balancer rules to redirect requests for your app to Tomcat
> server 2
> - Update server 1 (you can turn if off, restart it, do whatever you
> need, as your users aren't using it now) with your app v1.1
> - When it's ready, modify the balancer rules again to that requests for
> your app go to Tomcat server 1.
> - Watch things for a while, and if something goes bad with your new app
> you can just modify the balancer rules so that users go back to 1.0
> (again, no down time!)
> - But if things go well, you can turn off and update server 2 as well 
> so
> that you're ready for the next round.
> This is just the standard cluster/traffic-director setup done with
> Tomcat's balancer, which makes is a 100% Java, 100% free, lightweight
> solution.  There are non-Java and/or $$$ alternatives to this same
> approach that also work well.
> The focus is on using multiple servers instead of one, thereby allowing
> you to modify any one server at a time without causing down time for
> your users.
> Yoav
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