On 8 Jun 2003 at 21:59, Euan Guttridge wrote:
> slightly off subject : has anyone written a 'watchdog' for tomcat? Simply a
> process that checks if tomcat is alive every x seconds, if dead restarts
> tomcat.
I was after this a couple of months back. I found the solution in a list and
accomodated it for
tomcat. Nothing briliant, nor is it the only way.. But its quick, short and sweet.
This past
week I did this "type" of heartbeat mechanism, currently for an app on BEA 7.0
Criteria for the Tomcat heartbeat:
1. Tomcat request
a. No response no tomcat - Down
b. A Response tomcat is up
> If the requested servlet is not available then Tomcat throws a 404
status code
With this in mind:
create a heartbeat servlet that calls hbURLCon = (HttpURLConnection)
url.openConnection(); at
some time interval.
StatusCode =hbURLCon.getResponseCode();
if (statusCode > 400 & statusCode < 500) {
// report Tomcat up
}
You can get more sophisticated if you like.
