Single check script to monitor multiple processes

[Karl DeBisschop]

On Fri, 2003-05-02 at 13:06, Carroll, Jim P [Contractor] wrote:
> My bad.  I seem to recall someone has written a variation on the check_by_ssh plugin which kinda sorta does what you're looking for (without the verbose output).  Details escape me.

check_by_ssh in the core allows you to specify multiple check on the
remote server. If more than one check is called, it returns them as
passive check, so they appear as multiple services, even though only one
connection to the remote machine has been made.

in the general case, we try to keep the size and complxity of the
plugins somewhat limited so that it's not too inefficent to start up all
the new processes required by the running the checks individually.

>From a development point of view the modularity gained has seemed worth
the cost of the extra process creation, at least in all but the largest
scale deployments.

Off-hand, I see no other particularly strong reasons for grouping the
functionality at the development level. Do you?

And if you do, could that need be resolved with a generic aggrgator that
allows poeple to lump unit plugins to their taste instead of creating
one bloated plugin that has 20 capabilities of which only 2 might be
used on a given call?

--
Karl

> jc
> 
> 
> > -----Original Message-----
> > From: Jim Mozley [mailto:jim.mozley at exponential-e.com]
> > Sent: Friday, May 02, 2003 9:08 AM
> > To: nagios-users at lists.sourceforge.net
> > Subject: [Nagios-users] Single check script to monitor multiple
> > processes
> > 
> > 
> > *This message was transferred with a trial version of 
> > CommuniGate(tm) Pro*
> > Hi all,
> > 
> > I had an idea of something I wanted to do based on experience of using
> > another system management tool. I thought of using one script 
> > to monitor
> > multiple important processes rather than having individual checks.
> > 
> > For instance, if I have a server that runs an mta, dns, 
> > radius and a web
> > server my critical processes might be sendmail, named, 
> > radiusd and httpd.
> > The check could look for the presence of all important 
> > processes and report
> > if one or more were not running, perhaps returning a list of 
> > the failed ones
> > in a message.
> > 
> > Thinking that this might have been done before I started to 
> > look through the
> > plugins but cannot find anything that seems to do this.
> > 
> > Is this because such a thing doesn't exist?
> > 
> > Is this because its an especially bad idea with Nagios?
> > 
> > I can see why one wouldn't want to do this as, for instance, 
> > individual
> > checks allow actions to be taken for different processes. 
> > However, it seems
> > more efficient to check whether a group of processes is not 
> > working rather
> > than putting in place individual checks.
> > 
> > Jim
> > 
> > 
> > 
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> 
> 
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