In what context?? over the network?, over the web?, on the server?
There is a portion of the shell script used in a Linux implementation
for Tomcat 5.5 that checks for the running process:
if start-stop-daemon --test --start --pidfile $CATALINA_PID \
--user $TOMCAT5_USER
I have a script that checks to make sure that Tomcat is listening on the
appropriate port.
#!/bin/bash
...
main() {
...
chktomcat tomcat1
chktomcat tomcat2
...
}
...
chktomcat() {
netstat -a | grep $1 /dev/null 21
RC=$?
if (( RC == 0 ))
Kim
Do you have reason to believe that the OutOfMemory exception
is due to:
* some cumulative effect (e.g. memory leak), in which case
you need to restart, preferably (just) before it happens
* the qty of active sessions, so you need to load-balance
when near some threshold (offload to
Jeff Hoffmann wrote:
Christopher Schultz wrote:
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Dan,
Dan Armbrust wrote:
A simple cron job that points to a URL using lynx, and greps the
output for what it should see will do the trick...
I would use wget instead of Lynx, but that's just me.
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Kim,
Kim Albee wrote:
The JSP does a call to a method in our app -- which if it runs, that means
the app is up and available -- the method does a simple query against the DB
and then returns a status of OK if the method runs through just fine.
Everyone --
thanks for all the ideas and feedback.
We've attempted to take the approach with our health.jsp to check the major
functions in our application -- so if we can do a database request, that
checks a bunch of things - and returns without error lets us know that our
application is
| From: Kim Albee [mailto:[EMAIL PROTECTED]
| Sent: Tuesday, 21 August, 2007 12:49
|
| We use a monitoring tool that has the automated checks for the
application
| JVM and we can set different threshholds there -- but I've got to be
able
| to
| have the check run by the load balancer know that
No
-
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Hello --
We have a load balanced situation, and we have a JSP that runs and checks
our application to ensure it's up and returns a string that the monitor app
is looking for if all is well.
Repeatedly, that JSP will work, but the site is down because Tomcat hit an
OutOfMemory exception -- but
A simple cron job that points to a URL using lynx, and greps the
output for what it should see will do the trick...
Dan
On 8/20/07, Kim Albee [EMAIL PROTECTED] wrote:
Hello --
We have a load balanced situation, and we have a JSP that runs and checks
our application to ensure it's up and
How is your JSP checking your application? Are you issuing a request to
your app and checking the HTTP status? If so, why isn't it recognizing
the 500? Or is the JSP in your application which is failing?
| -Original Message-
| From: Kim Albee [mailto:[EMAIL PROTECTED]
| Sent: Monday,
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Dan,
Dan Armbrust wrote:
A simple cron job that points to a URL using lynx, and greps the
output for what it should see will do the trick...
I would use wget instead of Lynx, but that's just me.
Don't forget that the OP said that his JSPs appear
Christopher Schultz wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Dan,
Dan Armbrust wrote:
A simple cron job that points to a URL using lynx, and greps the
output for what it should see will do the trick...
I would use wget instead of Lynx, but that's just me.
Don't forget that the
Kim,
You mentiond fool-proof... Perhaps a multi-pronged approach is best,
if you have the time and inclination to implement it.
1) Apps can have issues for lots of reasons (running out of memory, db
load and/or locks, thread deadlocks, etc, etc.) In lots of cases the
VM/Tomcat are OK, but the
Dan,
True enough, except then those queries would get held as a user session, and
we don't want that -- which is why we have a 'skinny' health.jsp that checks
our app -- and 'should' crash if there are any issues with tomcat or the
application -- but in this case, the main pages were getting out
Tracy,
The JSP does a call to a method in our app -- which if it runs, that means
the app is up and available -- the method does a simple query against the DB
and then returns a status of OK if the method runs through just fine.
In our example from this weekend -- the health.jsp (which is the
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