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Subject Re: High Availability in Tomcat?
Date Mon, 09 May 2011 12:30:49 GMT
DNS update times are too long to trust on them
     If you want to have two installations, and direct users to
the one is working, you might have one IP address for the
machine that is in service at a given time, and switch that
address between the two machines as appropriate, NOT changing
the DNS, i.e., change the IP address of the Tomcat server.
                          Gustavo Avitabile

> On Mon, May 9, 2011 at 6:17 AM, Brian Braun <> wrote:
>> Hi,
>> I'm about to launch a service on the internet, using Tomcat 7. This service
>> should be available 24x7, it should never be unavailable (or virtually
>> never). However, I will definitely be improving and correcting my app
>> frequently, so I will have to republish the WAR file very often. Not even
>> considering the fact that my app has leaking problems (that's another story)
>> and therefore I will have to restart Tomcat itself, republishing the app
>> will make it unavailable for at least 10 seconds while I do it.
>> I'm thinking that I need to create a Tomcat Cluster. Is that the way to go?
>> Any opinions?
>> Another idea would be to have two tomcat installations, and to change the IP
>> my domain points to, to the IP that goes to that other Tomcat instance. But
>> changing the IP takes some time and I would have to wait until I think that
>> the DNS servers have updates the new IP, that would be slow and unreliable.
>> Thanks in advance,
>> Brian
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