Has anybody here tried the "Monit" utility (http://mmonit.com/monit/)? I need to set up some kind of "watchdog" functionality for a custom service otherwise started via init (i.e. via a script in /etc/init.d + rc*.d links managed by chkconfig) and it seems like this system may give me nearly what I want. However, something that concerns me about it, is that it appears to take full ownership of the services it monitors, and pretty much bypass the init system, in that once I've told monit to watch a process, it makes not difference if the associated service is enabled or not (via "chkconfig") , and there is no good way to fully stop the service, besides removing the Monit config or disabling Monit itself. (Or maybe I can use special "monit" commands, too, but that means precisely that Monit "owns" the service, which I somehow don't quite like.)
What I'd really like, is to have my process watched and restarted if it goes a way, but only if it had already been started via "init" or through the "service" command, or possibly direct execution of the "init.d" script. This also means it should be restarted if it crashes or if is stopped via a direct "kill", but not after "service <name> stop" or similar. Which might mean it all boils down to checking if, and only if, the pid file for the service already exists. (Does that make any sense?)
So, does anyone know if there is a way to convince Monit to do this for me? Or alternatively, is there a different tool that might do the job?
And yes, I know it shouldn't be that hard to design a program/script/cron job to do it all for me, but I still think not having to maintain another software component would be nice...
- Toralf
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