monitoring for IO in Nagios

[Alexander Harvey]

Ok well in case anyone else is wondering, here's the solution I came up
with:

# cat /usr/local/nagios/libexec/check_io.pl
#!/usr/bin/perl
# author: alex harvey
# email: alexh19740110 at gmail.com

# definitions
use constant OK => 0;
use constant WARNING => 1;
use constant CRITICAL => 2;

# read in config file
require "/usr/local/nagios/etc/check_io.cfg";

# main
open IOSTAT, "$IOSTAT $INTERVAL 3 | $TAIL -${LINES} |";
while ( <IOSTAT> ) {
   @col = split ' ';
   foreach $disk (keys %DISKS) {
      if ( $disk eq $col[0] ) {
         if ( $col[0] eq $disk ) {
            $DISKS{$disk}[0] = $col[1];
            $DISKS{$disk}[1] = $col[2];
            $DISKS{$disk}[2] = $col[7];
            $DISKS{$disk}[3] = $col[9];
         }
      }
   }
}
close IOSTAT;
$exit_state = OK;
foreach $disk (sort (keys %DISKS)) {
   if ( $DISKS{$disk}[2] >= $SVC_T_WTHRESHOLD && $DISKS{$disk}[3] >=
$PC_B_WTHRESHOLD )
   {
      if ( $DISKS{$disk}[2] < $SVC_T_CTHRESHOLD && $DISKS{$disk}[3] <
$PC_B_WTHRESHOLD )
      {
         $exit_state = ($exit_state < CRITICAL) ? WARNING : $exit_state;
      } else {
         $exit_state = CRITICAL;
      }
   }
   $exit_message = $exit_message.
       " ".$disk.
       ":: [ r/s: ".$DISKS{$disk}[0].
       ", w/s: ".$DISKS{$disk}[1].
       ", svc_t: ".$DISKS{$disk}[2].
       ", and %b: ".$DISKS{$disk}[3].
       " ],";
}
if ( $exit_state == OK ) {
   $exit_message = "OK -$exit_message";
} elsif ( $exit_state == WARNING ) {
   $exit_message = "WARNING -$exit_message";
} else {
   $exit_message = "CRITICAL -$exit_message";
}
$exit_message =~ s/,$/\n/;
print $exit_message;
exit $exit_state

And the configuration file:

# cat /usr/local/nagios/etc/check_io.cfg
# check_io.cfg

# constants
$DISKS = 3; # number of physical disk partitions

# diskid => [ r/s, w/s, service_time, %busy ]
%DISKS = (
   sd0 => [ 0, 0, 0, 0 ],
   sd1 => [ 0, 0, 0, 0 ],
   sd6 => [ 0, 0, 0, 0 ]
);

$IOSTAT = '/usr/bin/iostat -x';

$TAIL = '/usr/bin/tail';

$LINES = 7; # number of lines in iostat -x
$INTERVAL = 5; # second interval for iostat

$SVC_T_WTHRESHOLD = 30;
$PC_B_WTHRESHOLD = 5;
$SVC_T_CTHRESHOLD = 40;
$PC_B_CTHRESHOLD = 10;

This is for a Solaris box whose iostat output looks like this:

# iostat -x
                  extended device statistics
device       r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0          0.0    1.4    0.3    9.4  0.0  0.0   31.6   0   1
sd1          0.0    0.0    0.0    0.0  0.0  0.0    3.4   0   0
sd6          0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
st12         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
nfs1         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0

Regards,
Alex


On 10/17/06, Andreas Ericsson <ae at op5.se> wrote:
>
> Alexander Harvey wrote:
> > That doesn't look like a Solaris script to me but as far as your coding
> is
> > concerned, my thoughts are
> >
>
> [ excellent and non-disputed points removed ]
>
> > (iv) for security you ought to use full paths to all of your binaries:
> > i.e.
> > /usr/bin/echo
> > instead of
> > echo
> >
>
> "echo" is a built-in feature of pretty much all shells, so just using
> plain 'echo' is a perfectly viable and more performance friendly option.
>
> A better solution, for security's sake, is to force the $PATH to a safe
> value at the beginning of the script and not bother with full paths.
>
> As a last note, "echo" is required to exist on the root partition, which
> places it in /bin on all systems I've ever come across.
>
> --
> Andreas Ericsson                   andreas.ericsson at op5.se
> OP5 AB                             www.op5.se
> Tel: +46 8-230225                  Fax: +46 8-230231
>
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