monitoring-plugins-cyconet/check_iostats/check_iostats

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2020-09-15 10:07:25 +00:00
#!/usr/bin/perl
#
# Version 0.0.2 - Jan/2009
# Changes: added device verification
#
# by Thiago Varela - thiago@iplenix.com
# Version 0.1 - Nov/2011
# by Ruediger Oertel ro@suse.de
# Changes:
# - rewrite in perl, no need for external grep, awk, bc
# - add output for iowait
# - implement using device mapper names, e.g. $vg-$lv
use strict;
use Getopt::Std;
$Getopt::Std::STANDARD_HELP_VERSION = "true";
my $iostat = `which iostat 2>/dev/null`;
chomp($iostat);
my $progname = $0;
# call it VERSION_MESSAGE so that getopts uses it automatically
sub VERSION_MESSAGE {
print "$progname: version 0.1, Nov/2011\n";
}
# call it HELP_MESSAGE so that getopts uses it automatically
sub HELP_MESSAGE {
print "\n\tThis plugin shows the I/O usage of the specified disk, using the iostat external program.\n";
print "\tIt prints three statistics: Transactions per second (tps), Kilobytes per second\n";
print "tread from the disk (KB_read/s) and and written to the disk (KB_written/s)\n\n";
print "$progname:\n\t-d <disk>\t\tDevice to be checked (without the full path, eg. sda)\n";
print "\t\t\t\t(also accepted are device mapper names)\n";
print "\t-c <tps>,<read>,<wrtn>\tSets the CRITICAL level for tps, KB_read/s and KB_written/s, respectively\n";
print "\t-w <tps>,<read>,<wrtn>\tSets the WARNING level for tps, KB_read/s and KB_written/s, respectively\n";
print "\t-C <percent>\t Sets the CRITICAL level for iowait\n";
print "\t-W <percent>\t Sets the WARNING level for iowait\n";
print "\t\t\t(if no level is set for iowait, no warning is set for this value)\n";
exit 1;
}
unless ($iostat && -f $iostat) {
warn "ERROR: You must have iostat installed in order to run this plugin\n";
exit 1;
}
# Getting parameters:
my %opts;
getopts('d:w:c:W:C:hv', \%opts);
my $disk = $opts{'d'};
my $warning = $opts{'w'};
my $critical = $opts{'c'};
my $warning_iowait = $opts{'W'};
my $critical_iowait = $opts{'C'};
VERSION_MESSAGE() if $opts{'v'};
HELP_MESSAGE() if $opts{'h'};
# Adjusting the three warn and crit levels:
my ($crit_tps,$crit_read,$crit_written) = split(',',$critical);
my ($warn_tps,$warn_read,$warn_written) = split(',',$warning);
# Checking parameters:
if (! -b "/dev/$disk") {
if (-b "/dev/mapper/$disk") {
my @f = stat("/dev/mapper/$disk");
$f[6] %= 256;
$disk = "dm-$f[6]";
} else {
warn "ERROR: Device incorrectly specified\n";
HELP_MESSAGE();
}
}
unless ($warn_tps && $warn_read && $warn_written && $crit_tps && $crit_read && $crit_written) {
warn "ERROR: You must specify all warning and critical levels\n";
HELP_MESSAGE();
}
if ($warn_tps > $crit_tps || $warn_read > $crit_read || $warn_written > $crit_written) {
warn "ERROR: critical levels must be highter than warning levels\n";
HELP_MESSAGE();
}
if ($warning_iowait && $critical_iowait && $warning_iowait > $critical_iowait) {
warn "ERROR: critical iowait level must be higher that warning level\n";
HELP_MESSAGE();
}
my ($tps,$kbread,$kbwritten,$iowait);
my $seen_usage = 0;
my $seen_disk = 0;
# Doing the actual check:
open (IOSTAT,"-|","$iostat -k $disk 2 2");
while (<IOSTAT>) {
chomp();
if (/^[0-9\.\ \t]+$/) {
$seen_usage++;
next if $seen_usage < 2;
my (@stats) = split ('\s+', $_);
$iowait = $stats[4];
next;
}
if (/^$disk /) {
$seen_disk++;
next if $seen_disk < 2;
my (@stats) = split ('\s+', $_);
($tps,$kbread,$kbwritten) = @stats[1,2,3];
last;
}
}
close (IOSTAT);
my $msg = "OK";
my $status = 0;
# Comparing the result and setting the correct level:
if ($tps >= $warn_tps || $kbread >= $warn_read || $kbwritten >= $warn_written) {
$msg = "WARNING";
$status = 1;
}
if ($warning_iowait && $iowait >= $warning_iowait) {
$msg = "WARNING";
$status = 1;
}
if ($tps >= $crit_tps || $kbread >= $crit_read || $kbwritten >= $crit_written) {
$msg = "CRITICAL";
$status = 2;
}
if ($critical_iowait && $iowait >= $critical_iowait) {
$msg = "CRITICAL";
$status = 2;
}
# Printing the results:
print "$msg - I/O stats tps=$tps KB_read/s=$kbread KB_written/s=$kbwritten iowait=$iowait | 'tps'=$tps; 'KB_read/s'=$kbread; 'KB_written/s'=$kbwritten; 'iowait'=$iowait\n";
# Bye!
exit $status;