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Add disk space check script for ZFS filesystems 

This script checks the available disk space on all mounted filesystems, producing Nagios-ready exit codes and brief, human-readable text.
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Jim Salter 2026-01-19 23:23:34 -05:00 committed by GitHub
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#!/usr/bin/perl
# nagios plugin format: exit 0,1,2,3 for OK, WARN, CRITICAL, or ERROR.
# check_all_space_avail - test space available on all ZFS filesystems on host
# different values for pools named "backup" and other pools:
#
# default: warn 93%, crit 98%
my $warnlevel = .93;
my $critlevel = .98;
# accept warnlevel and critlevel as arguments if passed
if (defined $ARGV[0] && defined $ARGV[1] && $ARGV[0] >=0 && $ARGV[0] <=1 && $ARGV[1] >=0 && $ARGV[1] <=1) {
$warnlevel = $ARGV[0];
$critlevel = $ARGV[1];
}
my $msg,$warnfound,$critfound,$errfound;
# get standard df output, but skip the tmpfs and devtmpfs crap - this should leave us with
# nothing but disks. we WILL also get nfs or other network filesystems here, since we
# didn't use the -l flag. Feature, not bug. also skip UDF so we don't check free space on CDs!
my @filesystems = `/bin/df -x tmpfs -x devtmpfs -x udf`;
# get rid of header line
shift @filesystems;
foreach my $fs (@filesystems) {
chomp $fs;
# compress space to make sure split works right
$fs =~ s/ +/ /g;
my ($dev,$space,$used,$available,$percent,$mounted) = split(' ',$fs);
my $calcpercent = $used/$space;
my $prettypercent = sprintf('%.1F%',($calcpercent * 100));
if ($calcpercent > $critlevel) {
$critfound = 1;
$msg .= "$mounted: $prettypercent, ";
} elsif ($calcpercent > $warnlevel) {
$warnfound = 1;
$msg .= "$mounted: $prettypercent, ";
} elsif ($calcpercent < 0 || $calcpercent > 1) {
$errfound = 1;
$msg .= "$mounted: $prettypercent (WTF?), ";
}
}
$msg =~ s/, $//;
$msg .= "\n";
if ($critfound) {
print "CRITICAL: $msg";
exit 2;
} elsif ($warnfound) {
print "WARNING: $msg";
exit 1;
} elsif ($errfound) {
print "ERROR: $msg";
exit 3;
} else {
print "OK\n";
exit 0;
}
print "ERROR: $msg ?";
exit 3;