Nagios Support Forum

Hi team,

I have a ncpa plugin (nfs-kern.py script) which i have put under the location /usr/local/ncpa/plugins and given the user group as nagios:nagios.

i have edited the ncpa.cfg with the below changes as i have to run this script as sudo as we cannot run this script as Nagios user:

Comma separated list of plugins to run through sudo. Note: You will need to update your sudoers
# configuration for these plugins to work when called with sudo.
nfs-kern.py
# Example: check_special,check_root_files
# (Command line: sudo /<plugin_absolute_path>/check_special <arguments>)
#
# This is for Unix only (Linux, Mac OS X, etc)
#
run_with_sudo = /usr/local/ncpa/plugins/nfs-kern.py

after this when i am running the plugin using the nagios user, I am getting an error :PermissionError: [Errno 13] Permission denied:

Note: i have already added nagios user in the sudo group using command: sudo usermod -aG sudo nagios.

Hi,
How are you doing?
Since you already add the below to your remote NCPA agent, we also need to add the script to the "sudoers" file also. NOTE, the command you used in your last replied "sudo usermod -aG sudo nagios",
which only add "nagios" to the group call "sudo" .... this is NOT what we want.

Please use "visudo" command to add the followings to the "/etc/sudoers" file on your remote NCPA agent.
This will give "nfs-kern.py" to be ran with "sudo". Also, the "run_with_sudo" was add to NCPA 2.1, so please make sure you are using NCPA 2.1 or newer version.
https://www.nagios.org/ncpa/help/2.2/index.html


Best Regards,
Vinh

hi Vinh,

thanks for the reply!!!

i am using the NCPA version 2.3.1-1 on ubuntu. Added the sudoers file as per the above directions and if i run this script as Nagios user i get the permission denied error:

root@iadoscomp005:/usr/local/ncpa/plugins# su -c /usr/local/ncpa/plugins/nfs-kern.py nagios
Traceback (most recent call last):
File "/usr/local/ncpa/plugins/nfs-kern.py", line 11, in <module>
with open('/var/log/kern.log', 'r') as file:
PermissionError: [Errno 13] Permission denied: '/var/log/kern.log'
root@iadoscomp005:/usr/local/ncpa/plugins#

See the user permission in the attached screenshots. Check the attached screenshot for further information.

Hi,
How are you doing?
Based on the command used (below), you logged in as "root" and you instructed its to run as "nagios" user:

su -c /usr/local/ncpa/plugins/nfs-kern.py nagios

So, "nagios" user might not have permission to write to "/var/log/kern.log".

Please run the below command and post the outputs: You can also change the permission of "/var/log/kern.log" as follows, the re-ran the script again: Also, please upload your "nfs-kern.py" script.


Best Regards,
Vinh

i m not writing to that file , i just wanted to read from that file.

attached is the script

Hi,
Sorry, you are right .... you open the file for reading ....

Please do the followings, the re-ran your command again:
Best Regards,
Vinh

now it worked buddy!!!

wat extra did u do now which i missed earlier.

Hi,
Great!! .... glad that it is working now.

Your only issue earlier was permission of "/var/log/kern.log", which was fixed.

May I close this ticket?


Regards,
Vinh

u may close the ticket. thanks and have a good one!!

Great!! .... locking ticket ...