Hello All,
I have found the helpful fix after much of struggle, it might be useful someone
want to configure and monitor Iptables status.
After write your own plugin, then keep it in /usr/local/nagios/libexec dir.
1. open /etc/sudoers file and comment line as like below
#Defaults requiretty
2. End of /etc/sudoers file mention the line as below
nagios servername= NOPASSWD: /sbin/iptables,
/usr/local/nagios/libexec/check_nrpe
Note: Do remember to mention your own server name
Now you can test your plugin via check_NRPE and it will give you expected
results.
Good Luck!
Kind Regards,
Thilakraj Shanmugam
From: Thilakraj.Shanmugam
Sent: Wednesday, 29 May 2013 3:39 PM
To: Nagios Users List
Subject: RE: Nagios Plugin for IPTABLES Monitoring
Hi Deborah et al,
I have tested with nagios user as well.. still no luck with that. Could you
some one update if you have any solution on this case.
Kind Regards,
Thilak
From: Deborah Martin [mailto:deborah.mar...@kognitio.com]
Sent: Tuesday, 14 May 2013 7:30 PM
To: Nagios Users List
Subject: Re: [Nagios-users] Nagios Plugin for IPTABLES Monitoring
Ok - if I look at your output, manually, when the plugin is run as the "root"
user it produces the correct result.
But, you haven't said what the nrpe user is that is running on the remote node
and whether the same manual run of the check produces the same output.
For example, I run remote plugins through nrpe as the "nagios" user so if I
want to manually test a plugin on the remote node, I would first login as the
nagios user to ensure I've got the same environment that would be used when
running via nrpe. It might be that the variables you have set in the script
only work as the root user. It's never a good idea to test as the root user
but only as the same user as that used by nagios or nrpe.
Regards,
Deborah
From: Thilakraj.Shanmugam [mailto:thilakraj.shanmu...@canberra.edu.au]
Sent: 14 May 2013 09:58
To: Nagios Users List
Subject: Re: [Nagios-users] Nagios Plugin for IPTABLES Monitoring
Hi Deborah, Thanks for the response.. please find the details below.
[root@abc libexec]# pwd
/usr/local/nagios/libexec
[root@abc libexec]# ./check_iptables.sh
<----- Executing manually script
+ IPT=/sbin/iptables
+ GREP=/bin/grep
+ AWK=/bin/awk
+ EXPR=/usr/bin/expr
+ WC=/usr/bin/wc
+ A=/usr/bin/sudo
+ E_SUCCESS=0
+ E_CRITICAL=2
+ E_UNKNOWN=3
++ /usr/bin/sudo /sbin/iptables -nvL
++ /bin/grep Chain
++ /bin/awk '{ print $2 }'
++ /bin/grep Cid
++ /usr/bin/wc -l
+ CHAINS=5
+ '[' 5 -ne 0 ']'
+ echo 'Firewall is running!'
Firewall is running!
+ exit 0
<------ it shows firewall running
( correct output )
[root@abc libexec]#
Client - NRPE config file
[root@abc libexec]# cat /usr/local/nagios/etc/nrpe.cfg |grep -i iptable
command[check_iptables]=/usr/local/nagios/libexec/check_iptables.sh
[root@abc libexec]#
[root@abc libexec]# ./check_nrpe -H localhost -c check_iptables
Firewall is not running
<----- executing via check_nrpe
( wrong output )
[root@abc libexec]#
NRPE Logs
-------------
May 14 18:52:28 abc nrpe[31158]: Added
command[check_Partion_db]=/usr/local/nagios/libexec/check_disk -w 15% -c 5% -p
/db
May 14 18:52:28 abc nrpe[31158]: Added
command[check_Partion_app]=/usr/local/nagios/libexec/check_disk -w 15% -c 5% -p
/app
May 14 18:52:28 abc nrpe[31158]: Added
command[check_iptables]=/usr/local/nagios/libexec/check_iptables.sh
May 14 18:52:28 abc nrpe[31158]: INFO: SSL/TLS initialized. All network traffic
will be encrypted.
May 14 18:52:28 abc nrpe[31158]: Handling the connection...
May 14 18:52:28 abc nrpe[31158]: Host is asking for command 'check_iptables' to
be run...
May 14 18:52:28 abc nrpe[31158]: Running command:
/usr/local/nagios/libexec/check_iptables.sh
May 14 18:52:28 abc nrpe[31158]: Command completed with return code 2 and
output: Firewall is not running
May 14 18:52:28 abc nrpe[31158]: Return Code: 2, Output: Firewall is not running
Kind Regards,
Thilak
From: Deborah Martin [mailto:deborah.mar...@kognitio.com]
Sent: Tuesday, 14 May 2013 6:44 PM
To: Nagios Users List
Subject: Re: [Nagios-users] Nagios Plugin for IPTABLES Monitoring
Hi,
What is the wrong output being returned ? This might give us all a clue as to
the cause of the problem.
When you run the check manually, are you doing this as the same user that
check_nrpe will use ?
Regards,
Deborah
From: Thilakraj.Shanmugam [mailto:thilakraj.shanmu...@canberra.edu.au]
Sent: 14 May 2013 08:43
To:
nagios-users@lists.sourceforge.net<mailto:nagios-users@lists.sourceforge.net>
Subject: [Nagios-users] Nagios Plugin for IPTABLES Monitoring
Greetings!
Could someone send me nagios plugin which is tested and works well for
monitoring IPTABLES in Linux.
I have tested below script but it is not returning correct output to nagios
server.
If I execute script manually, it shows correct output...
But if I execute via ./check_nrpe - H localhost -c check_iptables, it shows
wrong output.
Below is my plugin
------------------------------
#!/bin/bash
set -x
IPT='/sbin/iptables'
GREP='/bin/grep'
AWK='/bin/awk'
EXPR='/usr/bin/expr'
WC='/usr/bin/wc'
A='/usr/bin/sudo'
E_SUCCESS="0"
E_CRITICAL="2"
E_UNKNOWN="3"
CHAINS=`$A $IPT -nvL | $GREP 'Chain' | $AWK '{ print $2 }'| $GREP Cid | $WC -l`
if [ $CHAINS -ne 0 ] ; then
echo "Firewall is running!"
exit ${E_SUCCESS}
elif [ $CHAINS -eq 0 ] ; then
echo "Firewall is not running"
exit ${E_CRITICAL}
fi
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