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