Status Information Field

[Jason Marshall]

> #define MAX_PLUGINOUTPUT_LENGTH                 352     /* max. length of
> plugin
>  output */
> 
> you could try upping that a bit, but it will probably introduce all sorts of
> nasty security holes.

You don't want to do this in Linux.  I do it in my Solaris nagios
installation because it's safe to bump it up.

The reason for the limit is there is a 512-byte limit in atomic operations
on names pipes in Linux.  In other words, 512 bytes is the most you can
read or write from or to a pipe with a GUARANTEE that the data will not be
interleaved with other reads/writes. This is critical when passing as much
information, and as often as Nagios does.

Solaris has a similar limit, but it's 5120-bytes.

I can fit this nice long status into my plugin output, for instance (see
attachment (sorry for the binary post -- it's tiny)...

> 
> Ewan
> 
> > -----Original Message-----
> > From: Jeffcoat, Al [mailto:ajeffco at orhs.org]
> > Sent: 10 September 2002 15:29
> > To: rpatl at gmx.at; nagios-users at lists.sourceforge.net
> > Subject: RE: [Nagios-users] Status Information Field
> > 
> > 
> > Hi,
> > 
> > I'm having the same problem with the check_disk plug-in.  It's
> > truncating the data.
> > 
> > No idea how to fix it, but just to say, you aren't alone ;)
> > 
> > Al
> > 
> > -----Original Message-----
> > From: rpatl at gmx.at [mailto:rpatl at gmx.at] 
> > Sent: Tuesday, September 10, 2002 10:15 AM
> > To: nagios-users at lists.sourceforge.net
> > Subject: [Nagios-users] Status Information Field
> > 
> > Hi !!
> > It's me again !!
> > I've a problem with the status.cgi and the extinfo.cgi:
> > If the status information is too long, it is cut off. For instance, I
> > monitor a switch with 24 ports and the plugin check_ifstatus 
> > returns the
> > state of
> > every port (down, up and dormant).
> > Is the buffer too small or the table field ??
> > 
> > I hope you can help me !!
> > Thanks in advance !!
> > Patrick
> > 
> > -- 
> > GMX - Die Kommunikationsplattform im Internet.
> > http://www.gmx.net
> > 
> > 
> > 
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---
Jason Marshall, Unix Geek, Kelman Technologies, Inc., Calgary, AB, Canada.

  From a Sun Microsystems bug report (#4102680):
    "Workaround: don't pound on the mouse like a wild monkey."

  "I have great faith in fools: 
     Self confidence my friends call it."  -Edgar Allan Poe

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