On 21/08/09 2:29 AM, Steven Stout wrote:
In your mod_webobjects configuration file, just add the URL to each
wotaskd in your WebObjectsConfig line.
WebObjectsConfig http://appserver1:1085, http://appserver2:1085,
http://appserver3:1085, http://appserverN:1085
Each adaptor will then merge the configs and serve up requests from any
of the app servers. Add your HTTP load balancer in front, and you
should be set.
When using a load balancer in front of multiple Apache instances within the
same wotaskd pool of instances, does the the load balancer need to be layer 7
or will layer 4 do fine? To explain more fully: each request is tied to a
specific WO instance through a cookie which ensures requests are routed to that
same instance for the life of the session. A layer 7 load balancer understand
HTTP and is able to ensure sessions are maintained to the same Apache httpd
front end. However a layer 4 balancer operates at the TCP level and is ignorant
of things like cookies.
Will WO cope if requests to a specific instance and session go to different
Apache httpd front ends from one request to the next?
Layer 4 load balancing is much less expensive since there are quite a few
firewalls with the capability for this feature, whereas the layer 7 balancing
involves lots of money very quickly.
Regards
Ari Maniatis
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ish
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