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From b6d2006d773e492f69abe2843e67a7eba2cfc415 Mon Sep 17 00:00:00 2001
From: Jan ONDREJ <ondrejj@salstar.sk>
Date: Thu, 7 Oct 2010 17:28:48 +0400
Subject: [PATCH 05/10] Prevent check_swap from returning OK, if no swap
activated
My swap was not activated on boot for unknown reason and nagios does not
report this as a problem. Here is an example:
[root@kecom ~]# rpm -q nagios-plugins
nagios-plugins-1.4.13-11.fc10.i386
[root@kecom ~]# /usr/lib/nagios/plugins/check_swap -w 80% -c 40% -c 1 -w 2
SWAP CRITICAL - 100% free (0 MB out of 0 MB) |swap=0MB;0;0;0;0
If there is no swap and users is trying to test percentage of free swap,
consider 0 MB free swap space as problem, or of free/total raises division
by zero, then set percentage to 0%, not to 100%.
Steps to Reproduce:
1. make sure, your swap is empty or it's usage is not large
2. swapoff -a
3. /usr/lib/nagios/plugins/check_swap -w 80% -c 40%
Actual results:
SWAP OK - 100% free (0 MB out of 0 MB) |swap=0MB;0;0;0;0
Expected results:
SWAP CRITICAL - 0% free (0 MB out of 0 MB) |swap=0MB;0;0;0;0
Additional info:
https://bugzilla.redhat.com/512559
---
plugins/check_swap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/plugins/check_swap.c b/plugins/check_swap.c
index ce1f602..6d1d0c1 100644
--- a/plugins/check_swap.c
+++ b/plugins/check_swap.c
@@ -124,7 +124,7 @@ main (int argc, char **argv)
free_swap_mb += dskfree_mb;
if (allswaps) {
if (dsktotal_mb == 0)
- percent=100.0;
+ percent = 0.0;
else
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
result = max_state (result, check_swap (percent, dskfree_mb));
--
1.8.3.1
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