I do a similar thing where I dynamically change the service check
definitions configured into Nagios. You've almost got to this solution
but say "and couldn't just ". Not sure why you say that but I'll briefly
cover what I did. You will need some programming/scripting.
First up in the nagios.cfg file configure either a specific
configuration file or directory where you will define your dynamic
service checks
eg cfg_dir=/etc/nagios/dynamic_services or
cfg_file=/etc/nagios/dynamic_services.cfg
Using a file/directory will be dependent on exactly how you need to
generate your checks.
Then at the point where you know what the service checks will be
generate the appropriate nagios config file based on what is in the
database into either your single config file or into one file each in
the dynamic directory.
You will then need to reload the nagios config and make sure it syntaxes ok.
We do this quite sucessfully. When customers add/delete servers we just
regenerate the config to match and reload Nagios.
David Rosenstrauch wrote:
Scratching my head as to how it might be possible to accomplish a
monitoring task I need to do:
We have a database table of tags. For each tag we have a process that
generates a Javascript file and pushes it out to a CDN. I've
successfully created a service check to monitor that the process runs
successfully (by using check_mysql_query to verify that a "pushed" date
gets updated on the database table). But we also need to monitor that
each of the files exists - and in the correct version - over at the CDN,
and here's where I'm hitting a wall.
What I'm envisioning is a way whereby I could dynamically generate a
whole bunch of service checks - one for each tag in the database table.
Each service check would then go and download its corresponding file
from the CDN, parse it, and verify the version number. In this way, if
any particular file was missing or the wrong version, we would get a
Nagios alert on that tag/file.
However, I don't see any clear way to approach this with Nagios. Near
as I can tell there doesn't seem to be any way to dynamically generate
service checks. From my reading of the docs, every service need to be
explicitly listed in the config files beforehand.
I was thinking that perhaps having a cron job that generates passive
checks might be a solution here, but again it looks like I would still
need to have the service checks defined beforehand in the nagios config
files, and couldn't just generate them on-the-fly based on the contents
of the database table.
Anyone have any ideas on how I could accomplish this file monitoring in
a dynamic fashion? (Note that alerting on a file-by-file basis is
needed here; it would not be sufficient to have a single service check
that monitors and alerts on all of the files.)
TIA,
DR
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