nicc777 wrote:
> On Jun 30, 1:25 am, "Sebastian \"lunar\" Wiesner"
> wrote:
>> Nico Kadel-Garcia :
>>
>>
>>
>>> nicc777 wrote:
>>>> Hi all,
>>>> Even though I use Linux a lot, I have not been doing a lot of hard
>>>> core Linux sysadmin stuff for some time, hence the question here :-)
>>>> Is there a way to trigger an event (like running a script) when a
>>>> process dies? Perhaps even a script to restart a process if it detects
>>>> that it's dead?
>>>> I have been using cron for monitoring processes up to now, but the
>>>> monitoring interval is 1 minute apart. I have a project (streaming of
>>>> nature) that should not go down, but the problem is that sometimes it
>>>> dies and it takes up to a minute before the traditional monitoring
>>>> script will restart it.
>>>> Any ideas?
>>>> Thanks - Nico.
>>> Nagios.
>> Suffers from the very problem, the OP was trying to avoid: A quite great
>> delay between the death of the specific process and the monitoring tool
>> running the check and thus noticing the dead process. Iirc, nagios uses
>> even higher intervals than one minute between checks.
>>
>> I guess, the OP wants something like inotify for processes: Passive
>> checking, yielding an _immediate_ notification about state changes, without
>> the unavoidable latency of active checks as nagios performs them.
>>
>> --
>> Freedom is always the freedom of dissenters.
>> (Rosa Luxemburg)
>
> Exactly - Time delays is what I try to get away from. Even seconds can
> mean potential customers leaving your service because there's no
> service :-(
>
> Thanks for explaining my problem more clearly !

OK. You need a monitor task that checks much more frequently. A cron script
could assure that the *MONITOR* is up and running, but the monitor could be a
simple shell script with a built-in 'restart if not working' setup.