dhis2-devs team mailing list archive

[Jason Pickering <jason.p.pickering@xxxxxxxxx>]

Knut told me about another way of unzipping the jar file, altering the
beans.xml file, and then zipping it up again, but this was too complex
for me. The good ole midnight commander is a nice utility knife.

I am not sure about the costs really, but the second approach is
better for a number of reasons I think. It allows more control over
each container, so that one might need more memory or different
settings or what not. Also, from a load balancing perspective, if one
container fails, it will not necessarily bring down both. I also think
there may be advantages related to CPU utilization (at the cost of
memory) when having the containers separate. However,it does of course
require the management of two separate instances, which may lead to
higher admin costs.



On Wed, Feb 22, 2012 at 12:21 PM, Bob Jolliffe <bobjolliffe@xxxxxxxxx> wrote:
> Nice subtle recommendation for the midnite commander :-)
>
> BTW I am also in favour of the latter of the two approaches.   But I
> am curious has anyone actually measured what the relative cost of
> running two tomcats vs one tomcat+2 webapps is?  I kind of feel
> instinctively that it doesn't cost much, but if anyone has a measure
> I'd be interested to hear.
>
> On 22 February 2012 05:15, Jason Pickering <jason.p.pickering@xxxxxxxxx> wrote:
>> Hi Dapo,
>>
>> I know of two ways to do this, and suspect there may be others.
>>
>> A) This method will utilize a single Tomcat container, with multiple
>> DHIS2 instances.
>> 0) Create two copies of the dhis.war file...dhis.war and dhis_XX,war
>> for instance. Unzip the war file into these directories.
>> 1) Using the tool "mc" navigate to
>> /webapps/dhis_XX/WEB-INF/lib/dhis-support-external.2.X.jar where X is
>> the version number.
>> 2) Open up the JAR file with mc and navigate to
>> META-INF/dhis/beans.xml and modify DHIS2_HOME to DHIS2_HOME_XX where
>> XX can be anything really.
>> 3) You need to setup an environment variable in your system for
>> DHIS2_HOME_XX   (i.e. /usr/local/etc/dhis2_XX/)
>> 4) Create a hibernate properties file in DHIS2_HOME_XX.
>> 5) Start Tomcat. You will now have two separate DHIS instance running
>> which are controlled by two separate environment variables
>> (DHIS2_HOME) and (DHIS2_HOME_XX)
>>
>> The disadvantage here is that you have to modify this file each time
>> you upgrade DHIS.
>>
>> B) Two separate Tomcat instances. This is the method I prefer.
>> 0) Create two separate tomcat instances...for instance
>> /usr/local/tomcat1 and /usr/local/tomcat2
>> 1) You will need to modify the server.xml file of one of the instances
>> (e.g tomcat2) to startup on a different port that /tomcat1. How you do
>> this depends a bit on the types of connectors you may be using
>> (HTTP,AJP, etc) but this is well documented elsewhere about how to
>> modify the ports Tomcat runs on.
>> 2) Create a file in each /bin directory of the tomcat directories
>> called setenv.sh (Linux) or setenv.bat (Windows) and define the
>> DHIS2_HOME directory to point to two separate locations. Create two
>> separate hibernate.properties files.
>> 3) You will now have two separate instance running on the ports which
>> you have defined in the respective server.xml files.
>>
>>
>> Hope this helps.
>>
>> Best regards,
>> Jason
>>
>>
>>
>> On Tue, Feb 21, 2012 at 5:23 PM, Dapo Adejumo <dapo_adejumo@xxxxxxxxx> wrote:
>>> Hello,
>>> Please does anyone have any ideas on how to deploy multiple instances on a
>>> single server in an efficient manner which doesn't drain server resources
>>> dramatically.....Thinking of Deploying multiple instances of Tomcat  VS
>>> Multiple war files in the same Tomcat.
>>>
>>> Thank you.
>>>
>>>
>>> ________________________________
>>>
>>> Regards,
>>>
>>> Adedapo Adejumo.
>>> Mobile : +2348033683677
>>> Skype  : dapojorge
>>>
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>>
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