geronimo-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jeff Genender <jgenen...@apache.org>
Subject Re: Clustering and Tomcat 5.5.12
Date Mon, 14 Nov 2005 18:10:43 GMT


Ludovic Maitre wrote:
> Hi Jeff and all,
> 
> I will do the second guinea pig, i would like to run 3 tomcat instances 
> inside geronimo. The purpose is to be able to upgrade apps on my website 
> without downtime. I was wondering if i can derivate some GBeans to 
> implements some "farming" on my cluster (deploy the webapps on each node 
> as i understand it -- but i just began to transpose the concepts i know 
> from weblogic to geronimo).
> 
> I don't understand yet why multiples IPs are required but sure i will 
> see the problem when i will implement this setup, (actually this *seems* 
> to run fine with apache2 as load balancer and my 3 tomcat instances 
> listenning to differents ports),
> Many thanks for having committed the GBeans i will check out them now,

Yep...different ports works peachy too ;-)

> Best regards,
> 
> Jeff Genender wrote:
> 
>>
>>
>> Dave Colasurdo wrote:
>>
>>> I'm interested in testing and helping to document geronimo Tomcat 
>>> clustering.  As a first step, I've setup a Tomcat cluster independent 
>>> of Geronimo.  Once I get this fully working, I plan to reuse the 
>>> configuration info in the geronimo environment.
>>
>>
>> Thank you for taking the initiative on this.  You will be our main 
>> test on this since it has been limited for me due to my time constraints.
>>
>>>
>>> I've managed to setup the Apache http server and mod_jk as the load 
>>> balancer and do see the requests get sprayed to different tomcat 
>>> servers (on two diferent machines).  Sticky port is enabled and I see 
>>> the node id in the cookie and the rewritten url..
>>>
>>> Initially, I tried using memory replication.  Cluster membership 
>>> between the nodes isn't working.  I believe this is due to the fact 
>>> that both machines are using DHCP and that their IP addresses aren't 
>>> on the same subnet.  I can always use two Tomcat installs on the same 
>>> machine though was hoping to setup a more realistic scenario using 
>>> multiple machines. I guess I need to setup a shared file system or 
>>> use a database.
>>> Any advice?
>>
>>
>> Yep...(relative to geronimo) if you want to run it on the same 
>> machine...you have some hacking to do on the plans.  You should be 
>> able to alias your IP address to support multiple IPs.  Then in the 
>> Tomcat plan, you need the connectors of each instance to listen on one 
>> of the IP addresses (of course each instance should be listening on a 
>> different IP address).  For stand alone tomcat, this would be a 
>> similar process...the connectors need to listen on their own addresses.
>>
>> IMHO, I would test this on multiple machines before a single machine 
>> with a single instance since you will probably run into other problems 
>> as well with other services in Geronimo.  After you get a 
>> multi-machine cluster working, then we  can configure it for a single 
>> machine.
>>
>> Also, The engine GBean needs to use the jvmRoute initparam and you 
>> should make separate names for each instance (i.e. node1, node2, etc).
>>
>>>
>>> Assuming this works out.. A few question concerning running 
>>> clustering within Geronimo.
>>>
>>> For tomcat, I update server.xml to configure AJP Connector, Cluster 
>>> config, Engine jvmRoute, etc.. How will we configure silmilar type
>>> information in Geronimo?
>>
>>
>> It follows the same paradigm as the other Tomcat GBeans.  You can set 
>> up a cluster at the Engine, Host, or Context level.  The Valves and 
>> Realms are a great example of this.  For the host and engine 
>> clustering you will do it in the j2ee-tomcat-plan.xml.  For context 
>> you will do it in a geronimo-web.xml or web descriptor plan.
>>
>> I will write up an example and email it to the lists and then you can 
>> give it a try.
>>
>>>
>>> Do the distributable applications need to create deployment plans 
>>> that reference the new GBeans?
>>
>>
>> Depends whether you only want to cluster at a Context level or a host 
>> level.
>>
>>>
>>> Any additional steps?
>>
>>
>> Yep...stay tuned...I'll write something up.  Thank you very much for 
>> being the guinea p^H^H^H^H^H^H^H^H test person on this ;-)
>>
>>>
>>> Thanks
>>> -Dave-
>>>
>>>
>>>
>>> Jeff Genender wrote:
>>>
>>>> I have checked in some initial Clustering GBeans for Tomcat.  As I 
>>>> developed this, it appeared that the Tomcat version 5.5.9 did not 
>>>> match the Tomcat doc.  This led me to examine the Tomcat objects and 
>>>> changelog.  It would appear that there were some improvements 
>>>> between TC v 5.5.9 and 5.5.12, especially with regard to 
>>>> Clustering.  so due to this, I have upgraded our version of Tomcat 
>>>> to 5.5.12.
>>>>
>>>> I have tested this with some of our applications (i.e. console) and 
>>>> the unit tests.  All looks good to me... so far ;-)
>>>>
>>>> If there are any issues, let me know.
>>>>
>>>> Jeff
>>>>
>>>>
>>
>>
> 
> 

Mime
View raw message