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Some questions about NCPA

https://support.nagios.com/forum/viewtopic.php?t=34572

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Re: Some questions about NCPA

Posted: Wed Sep 09, 2015 5:15 pm
by RandomGuy86
lmiltchev wrote:1.

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grep nag /etc/group

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2. service iptables stop
3. Also, I wanted to see the "nagios.conf", not the "nagios.cfg". It should be in: "/etc/httpd/conf.d/nagios.conf".
1.

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nagios:x:501:
nagcmd:x:502:nagios,apache
2. What's the command to start them again?

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service iptables start
?

3.
nagios.conf
(1.64 KiB) Downloaded 153 times
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edit:

Okay, tried to make my own command for active checks. This survives the validation check:

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/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

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define command{
	command_name		check_ncpa
	command_line		/usr/local/nagios/libexec/./check_ncpa.py -H $HOSTADDRESS$ -t nagi_os_NCPA -M CPU/Percentage
	}

define service{
	use			generic-service
	host_name		winserver
	service_description	NCPA CPU Percent
	check_command		check_ncpa
	}
However it produces the following error message in the web interface:

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(Return code of 13 is out of bounds)
Okay, it returns a different error message now... I guess check_ncps.py returns value is not compatible to the web interface?!

Also, I've tried to use added arguments:

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define command{
	command_name		check_ncpa
	command_line		/usr/local/nagios/libexec/check_ncpa.py -H $HOSTADDRESS$ -t nagi_os_NCPA -M $ARG1$
	}

define service{
	use			generic-service
	host_name		winserver
	service_description	NCPA CPU Percent
	check_command		check_ncpa|CPU
	}
If I try to vertify that it returns 1 error:

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Error: Service check command 'check_ncpa|CPU' specified in service 'NCPA CPU Percent' for host 'winserver' not defined anywhere!

Re: Some questions about NCPA

Posted: Thu Sep 10, 2015 10:29 am
by lmiltchev
Yes, you can start iptables by running:

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service iptables start
As for the command and a service definitions, can you try the following?

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define command{
   command_name      check_ncpa
   command_line      /usr/local/nagios/libexec/check_ncpa.py -H $HOSTADDRESS$ $ARG1$
   }
   
define service{
   use         generic-service
   host_name      winserver
   service_description   NCPA CPU Percent
   check_command      check_ncpa!-t 'nagi_os_NCPA' -P 5693 -M cpu/percent -w 80 -c 90
   }
Let me know if this helped. Thank you!

Re: Some questions about NCPA

Posted: Thu Sep 10, 2015 12:39 pm
by RandomGuy86
lmiltchev wrote:As for the command and a service definitions, can you try the following?
Oh, I understand why my method was not working; I used "|", not "!", as a delimiter. Thanks.
Btw: Is two arguments the maximum?

I still get the error "(Return code of 13 is out of bounds)", though.

So, any idea how to get the NRDP server working? That's the config file of NRDP if it is of any help:
nrdp.conf
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Re: Some questions about NCPA

Posted: Thu Sep 10, 2015 4:41 pm
by lmiltchev
Btw: Is two arguments the maximum?
You can place whatever you want after the delimiter - it is still going to be "$ARG1$". See the plugin's usage by running:

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/usr/local/nagios/libexec/check_ncpa.py -h
I still get the error "(Return code of 13 is out of bounds)", though.
Where do you see this error? Can you show us a screenshot? Also, show us the actual command run from the command line, along with the output of it.

Re: Some questions about NCPA

Posted: Thu Sep 10, 2015 5:20 pm
by RandomGuy86
lmiltchev wrote:Where do you see this error? Can you show us a screenshot? Also, show us the actual command run from the command line, along with the output of it.
Command:

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/usr/local/nagios/libexec/check_ncpa.py -H 192.168.56.1 -t 'nagi_os_NCPA' -P 5693 -M cpu/percent -w 80 -c 90
Output:

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OK: percent was 29%,30%,33% | 'percent_0'=29%;80;90; 'percent_1'=30%;80;90; 'percent_2'=33%;80;90;
Screenshot: (the other error message can be ignored, they are using outdated code)
Web Interface Error Message.jpg

Re: Some questions about NCPA

Posted: Fri Sep 11, 2015 11:00 am
by lmiltchev
The good news is that your check works from the command line. Let's find out why it is failing in the web UI.

Did you restart nagios after making the changes to the "check_ncpa" command and the "NCPA CPU Percent" service definitions? Can you post these two configs along with the "winserver" host's config?

Re: Some questions about NCPA

Posted: Fri Sep 11, 2015 12:04 pm
by RandomGuy86
Just to be sure I entered these two commands again:

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/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
/etc/rc.d/init.d/nagios reload
Not really changed anything in this file except that windows.cfg should be loaded:
nagios.cfg
(43.78 KiB) Downloaded 154 times
I did not removed the old code here:
windows.cfg
(4.25 KiB) Downloaded 185 times
"winservers" host config (NCPA.cfg on the client):
ncpa.cfg
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Re: Some questions about NCPA

Posted: Fri Sep 11, 2015 1:49 pm
by lmiltchev
I didn't see any issues in these configs. I would recommend removing the command definition from windows.cfg and placing it in commands.cfg (for consistency):

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define command{
   command_name      	check_ncpa
   command_line      	/usr/local/nagios/libexec/check_ncpa.py -H $HOSTADDRESS$ $ARG1$
   }
Can you run the following commands and post the output:

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uname -a
cat /etc/*release
ls -la /usr/local/nagios/libexec/check_ncpa.py
/usr/local/nagios/libexec/check_ncpa.py -V
ps -ef | grep bin/nagios

Re: Some questions about NCPA

Posted: Fri Sep 11, 2015 2:16 pm
by RandomGuy86
uname -a

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Linux Scientific.Linux.Server 2.6.32-573.3.1.el6.x86_64 #1 SMP Thu Aug 13 12:55:33 CDT 2015 x86_64 x86_64 x86_64 GNU/Linux
cat /etc/*release

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LSB_VERSION=base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Scientific Linux release 6.7 (Carbon)
Scientific Linux release 6.7 (Carbon)
ls -la /usr/local/nagios/libexec/check_ncpa.py

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-rwxr--r--. 1 root root 9332  8. Sep 06:25 /usr/local/nagios/libexec/check_ncpa.py
/usr/local/nagios/libexec/check_ncpa.py -V

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check_ncpa.py, Version 0.3.5
ps -ef | grep bin/nagios

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nagios    1784     1  0 Sep08 ?        00:00:43 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
nagios    1814  1784  0 Sep08 ?        00:00:25 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
root      2342  2597  0 22:28 pts/0    00:00:00 grep bin/nagios
nagios   32746  1784  0 20:14 ?        00:00:03 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios   32747  1784  0 20:14 ?        00:00:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios   32748  1784  0 20:14 ?        00:00:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh
nagios   32749  1784  0 20:14 ?        00:00:00 /usr/local/nagios/bin/nagios --worker /usr/local/nagios/var/rw/nagios.qh

Re: Some questions about NCPA

Posted: Sun Sep 13, 2015 7:38 am
by RandomGuy86
Solved my issue with active checks with NCPA.

If you ever encounter this "error of 13" error, the most likely cause seems to be wrongly set owner of rwx rights of a file; in my case it was the file check_ncpa.py. The user Nagios was not allowed to execute the file.

The following command fixed this issue for me:

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chmod o+x usr/local/nagios/libexec/check\_ncpa.py
Alternatively one could also give ownership to the user Nagios.

<>

edit:
Okay, I still have an issue with NCPA when the client is Linux.

To make sure the Nagios Server can connect to the Linux Client I've added the following line to /etc/sysconfig/iptables

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-A INPUT -p tcp --dport 5693 -j ACCEPT
However I cannot access the API from another machine.
When I disable iptables it works.

edit2:
Another little issue I have with NCPA:
How do I translate this URL:

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https://192.168.56.1:5693/api/memory/virtual?check=1?token=nagi_os_NCPA
Into a command: (in particular the ?check=1)

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/usr/local/nagios/libexec/check_ncpa.py -H 192.168.56.1 -t nagi_os_NCPA -P 5693 -M memory/virtual -n M ?check=1
<>

So, now I just have to get my passive checks working (with NRDP).
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