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<p class=MsoNormal>We’re been exploring the use of twill to help us
monitor web based applications and have been making good progress. We’re
run into one problem which I thought I would bounce off of this group to see if
there were any “best practices” for dealing with this type of
issue.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We have a small group of our most important applications
sitting behind a load balancer. For example, we have a collection of web
servers which all support an application called Blackboard. If I
have three of these Blackboard servers sitting behind the load balancer, I can
create three twill scripts which monitor the application on each of these web
servers. However, I really don’t care if one or even two of these
web servers are down. As long as one of these web servers is functioning,
the application is considered to be “up”.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’d really just like to go to one URL, let the load
balancer direct me to one of the available application servers, and test to
verify that the application server is responding to a scripted login
request. Unfortunately, our twill scripts don’t seem to be being
redirected to the respective application servers so we’ve been forced to
run multiple scripts, one for each application server, and need to determine if
all three application servers are not responding before we flag the application
as “down”.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>How do we do this? I’d like to be able to test
all three, set some type of “condition code” for each test, and
then only return a failure if all three condition codes indicate a failure but it
doesn’t appear as if twill has the ability to compare values, branch,
etc. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any suggestions?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Mart <o:p></o:p></p>
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