[Xymon] Server Script

[Jeremy Laidman]

(Please cc to the list so others can help or learn.)

On Fri, 1 Jul 2016, 01:47 Joshua Hunt <joshuasocrates at gmail.com> wrote:

>  Here is the error I receive when I run using
> $XYMONHOME/server/bin/xymongrep :
>
> /server/bin/xymongrep: No such file or directory
>

The environment variable XYMONHOME isn't set.  Such scripts are usually run
within a xymon environment. For testing, it's easiest to setup the
environment by running xymoncmd.  You can either run xymoncmd with no
arguments and use it as an interactive shell (and then run your script like
you have been), or you can give your script to xymoncmd as an argument.

Like:

$ xymoncmd /your/script

However, I have gone ahead and put in a manual path without using Xymon
> built in variables,
>

This is probably the cause of you're troubles.

and that seems to work just fine.
>

"Seems to", meaning with no error?

When I do that though, the majority of the script flat out doesn't run.
>

If the output of xymongrep is empty (either an error, or no matching lines)
then the while loop body won't execute even once.

Note that xymongrep uses some xymon environment variables to do what it
needs to do, so of you're not running it via xymoncmd or xymonlaunch, it
might not be able to get any output for your script to use. At the very
least, xymongrep needs HOSTCFG to be set to the path of the hosts.cfg file,
according to the xymongrep man page.

Anything following "while read L" is skipped, so I'm assuming that my
> problem is ultimately lying in that line.
>

Yes, or the input to that line via the pipe is the problem.

HOSTTAG="tagname"
> COLUMN="${HOSTTAG}"
> $XYMONHOME/server/bin/xymongrep "${HOSTTAG}" | while read L
> do
>
>      set "$L"
>
>      HOSTIP="$1"
>      MACHINEDOTS="$2"
>

Try running this exact xymongrep command manually, after setting HOSTTAG
and XYMONHOME, like:

$ HOSTTAG="tagname"
$ XYMONHOME=~xymon
$ $XYMONHOME/server/bin/xymongrep "${HOSTTAG}"

I suspect you'll get no output because xymongrep can't do what it needs
because environment.

Then do the same but within a xymoncmd shell.

     MACHINE=$(echo $2 | $SED -e's/\./,/g')     # I am not sure what this
> line is for or what it entirely does. Under the impression it replaces
> periods with commas.
>

Yes that's correct. This is historical and harks back to the days of
xymon's forerunner, BigBrother. MACHINEDOTS is the FQDN hostname with dots
as normal, MACHINE is the same but with commas instead. Xymon doesn't care,
but its the convention.

Running your script under xymoncmd will setup these two variables for you.

On Thu, Jun 30, 2016 at 2:10 AM, Jeremy Laidman <jlaidman at rebel-it.com.au>
> wrote:
>
>> Can you show the exact errors? Also, show the whole script?
>>
>> On Thu, 30 Jun 2016, 01:16 Joshua Hunt <joshuasocrates at gmail.com> wrote:
>>
>>> So I'm trying to implement a server script, and I'm getting some errors
>>> with the beginning of my code, specifically the section that ties to Xymon.
>>>
>>> HOSTTAG="tag"
>>> COLUMN="$HOSTTAG"
>>>
>>> # Here is where I get my first error. Directory apparently does not
>>> exist. However, later in the script
>>> I source from a similar location and all works fine. I have manually
>>> checked, this location does exist.
>>> $XYMONHOME/server/bin/xymongrep "$HOSTTAG" | while read L
>>> do
>>>
>>> _______________________________________________
>>> Xymon mailing list
>>> Xymon at xymon.com
>>> http://lists.xymon.com/mailman/listinfo/xymon
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.xymon.com/pipermail/xymon/attachments/20160630/27081104/attachment.html>