Hello!
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?
Christian
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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