Nagios Support Forum

NOTE: I have this working on a separate Centos 7 minimal install but I installed nagios from source so something is not the same when installing as below:

Fresh minimal Centos install (with developer tools and sysadmin tools installation options ticked)
yum install epel-release
yum install nagios nagios-plugins-all
systemctl start nagios.service
systemctl start httpd.service
systemctl enable nagios
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload

Logged in to nagios web page successfully and confirmed localhost checks were working and returning OK.

[root@nagios-yum tmp]# whereis nagios
nagios: /usr/sbin/nagios /usr/lib64/nagios /etc/nagios /usr/share/nagios

Nagios Plugins Folder:
/usr/lib64/nagios/plugins

Tested ./check_ups --help and this worked as expected.

wget https://assets.nagios.com/downloads/ncp ... cpa.tar.gz
tar zxf check_ncpa.tar.gz
chown nagios:nagios check_ncpa.py
chmod 775 check_ncpa.py
cp check_ncpa.py /usr/lib64/nagios/plugins
cd /usr/lib64/nagios/plugins
./check_ncpa.py -V
: No such file or directory
[root@nagios-yum plugins]# python
Python 2.7.5 (default, Jun 20 2019, 20:27:34)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
[root@nagios-yum plugins]# which python
/usr/bin/python
[root@nagios-yum plugins]# whereis python
python: /usr/bin/python /usr/bin/python2.7 /usr/lib/python2.7 /usr/lib64/python2.7 /etc/python /usr/include/python2.7 /usr/share/man/man1/python.1.gz

Modified shebang in check_ncpa.py to #!/usr/bin python
[root@nagios-yum plugins]# ./check_ncpa.py -V
-bash: ./check_ncpa.py: /usr/bin: bad interpreter: Permission denied

I noticed that all other plugins have 3 whereas check_ncpa.py has 10:
ls -al /usr/lib64/nagios/plugins
-rwxr-xr-x. 1 nagios nagios 49664 Jan 3 2019 check_mrtgtraf
-rwxr-xr-x. 1 nagios nagios 62528 Jan 3 2019 check_mysql
-rwxr-xr-x. 1 nagios nagios 58208 Jan 3 2019 check_mysql_query
-rwxr-xr-x. 1 nagios nagios 53768 Jan 3 2019 check_nagios
-rwxr-xr-x. 1 nagios nagios 10563 Aug 10 21:41 check_ncpa.py
lrwxrwxrwx. 1 nagios nagios 9 Aug 10 21:29 check_nntp -> check_tcp
lrwxrwxrwx. 1 nagios nagios 9 Aug 10 21:29 check_nntps -> check_tcp
-rwxr-xr-x. 1 nagios nagios 66336 Jan 3 2019 check_nt
-rwxr-xr-x. 1 nagios nagios 14360 Jan 3 2019 check_ntp
-rwxr-xr-x. 1 nagios nagios 62536 Jan 3 2019 check_ntp_peer
-rwxr-xr-x. 1 nagios nagios 14360 Jan 3 2019 check_ntp.pl



Am i missing something?? Is anyone able to help me get the check_ncpa.py plugin working??

Thanks in advance.

So I have fixed this but my fix means there may be something wrong with the check_npca.tar.gz file currently available on the nagios website.

SOLUTION:
I copied the check_ncpa.py file from my working nagios server (source installation type) as I noticed it was a different size to the file downloaded last night on my repo installation server.

Working check_ncpa.py file:
-rwxr-xr-x. 1 root root 10264 Aug 11 14:01 check_ncpa.py

NON-WORKING file downloaded last night from nagios website using wget:
wget https://assets.nagios.com/downloads/ncp ... cpa.tar.gz
tar zxf check_ncpa.tar.gz
-rwxrwxrwx. 1 root root 10567 May 1 20:21 check_ncpa.py

I believe the issue is with the file currently available from the nagios website.

Since copying the working file, my repo installed nagios is now reporting the correct result:
[root@nagios-yum plugins]# ./check_ncpa.py -V
check_ncpa.py, Version 1.1.5

ok so I thought I'd fixed it but a separate issue has appeared now that I have migrated my config files over and I'm monitoring my hosts.

any check_ncpa.py check on a remote host is failing with:
[1565539496] Warning: Return code of 13 for check of service 'Host Time Zone' on host 'V-ADC-001' was out of bounds.

Logged in as root I can run successfully:
[root@nagios-yum plugins]# ./check_ncpa.py -H 192.168.150.133 -P 5693 -t 'thisismytoken' -M 'disk/logical/C:|/used_percent' -w 90 -c 95 -u Gi
OK: Used_percent was 24.80 % | 'used_percent'=24.80%;90;95;

but it appears that the nagios user cannot successfully run check_ncpa.py ??

I have checked my working nagios server against the new repo installed server and the nagios user does have diffferences:
source installed:
[root@V-NAGIOS-01 objects]# cat /etc/passwd
nagios1001:/home/nagios:/bin/bash

repo installed:
[root@nagios-yum nagios]# cat /etc/passwd
nagios997:995::/var/spool/nagios:/sbin/nologin

would this cause an error 13 out of bounds?
Anything else I need to check?

changed nagios in passwd to /bin/bash

su nagios

bash-4.2$ ./check_ncpa.py -H 192.168.150.133 -P 5693 -t 'thisismytoken' -M 'disk/logical/C:|/used_percent' -w 90 -c 95 -u Gi
OK: Used_percent was 24.80 % | 'used_percent'=24.80%;90;95;


so it works from the command line when running under nagios and root

[root@nagios-yum private]# cat resource.cfg
# Sets $USER1$ to be the path to the plugins
$USER1$=/usr/lib64/nagios/plugins

my command:
### NCPA AGENT ###
define command {
command_name check_ncpa
command_line $USER1$/check_ncpa.py -H $HOSTADDRESS$ -t 'thisismytoken' -P 5693 $ARG1$
}


I'm a bit stumped now

seems the check_ncpa.py file had windows line endings and the people looking after it on github have uploaded a correct verison.

deleted my VM and spun up a new one and installed nagios from epel repo fresh and check_ncpa.py checks now working as expected.

Good to hear it is resolved!