Nagios Support Forum

Hi guys,
I've problem with Nagios Core and the plugin NCPA, that's the error:
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ncpa.py, ...) failed. errno is 2: No such file or directory

ans that's the scenario:

Nagios Core 4.3.2 On CentOS 6.9
More than 40 Wiondow Server monitored by Nagios and NSCP succesfully

Client NCPA installed on a ContOS 6.9
Web UI run perfectly and port 5693 is open


NAGIOS CONFIGURATION

COMMAND DEFIN. CFG
define command {
command_name check_ncpa
command_line $USER1$/check_ncpa.py -H $HOSTADDRESS$ -p 5693 $ARG1$
}

TEMPLATE DEF CFG
define host {
name ncpa
hostgroups ncpa
use generic-host
check_command check_ncpa
max_check_attempts 5
check_interval 5
retry_interval 1
check_period 24x7
contacts nagiosadmin
notification_interval 60
notification_period 24x7
notifications_enabled 1
register 0
}

SERVER FOLDER CONTAIN THIS CFG

define hostgroup{
hostgroup_name ncpa ; The name of the hostgroup
alias NCPA ; Long name of the group
}

define host{
use ncpa ; Inherit default values from a template
host_name ftp-server ; The name we're giving to this host
alias FTP-SERVER ; A longer name associated with the host
address 10.1.3.4 ; IP address of the host
}

define service{
use generic-service
host_name ftp-server
service_description Agent Version
check_command check_ncpa!-t 'mytoken' -P 5693 -M system/agent_version
}

define service{
use generic-service
host_name ftp-server
service_description CPU Usage
check_command check_ncpa!-t 'topconsult' -P 5693 -M cpu/percent -w 20 -c 40 -q 'aggregate=avg'
}


RESOURCE CFG
$USER1$=/usr/local/nagios/libexec


Python is installed, version 2.6.6
...but something sounds bad, when I try to run this check (inside folder libexec where i copy check_ncpa.py)
./check_ncpa.py -H 10.1.3.4 -t mytoken -M 'memory/virtual/percent'
console give me an error: No such file or direcotry

Plugin check_ncpa.py version 1.1.1 is in folder /usr/local/nagios/libexec with 755 permission for the user "nagios".


Any suggestion?
I've a big headache

Thanks man!

Can you run the following commands on the remote box (10.1.3.4), and show the output?
Also, re-run the command below from the CLI on the Nagios server with increased verbosity, and show the output:

In addition to what @lmiltchev asked for, can you run the following on the Nagios server as root and post the output?

/etc/init.d/ncpa_listener restart
Stopping NCPA Listener: [ OK ]
Starting NCPA Listener: [ OK ]

/etc/init.d/ncpa_listener status
NCPA Listener: Service is running. (pid 32552)

/etc/init.d/ncpa_passive restart
Stopping NCPA Passive: [ OK ]
Starting NCPA Passive: [ OK ]

/etc/init.d/ncpa_passive status
NCPA Passive: Service is running. (pid 32610)


./check_ncpa.py -H 10.1.3.4 -t mytoken -M 'memory/virtual/percent' -vvv
-bash: ./check_ncpa.py: /usr/bin/python^M: bad interpreter: No such file or directory


which env
/bin/env

which python
/usr/bin/python

ls -l /usr/bin/env
lrwxrwxrwx 1 root root 13 May 4 08:45 /usr/bin/env -> ../../bin/env

python -V
Python 2.6.6

-bash: ./check_ncpa.py: /usr/bin/python^M: bad interpreter: No such file or directory

Hmm, I wonder if you have a DOS EOL... Try running the following command on the Nagios box:
Next, try again:

Yes!!! Solve the problem for me!
Thank you very much

yum install dos2unix -y && dos2unix /usr/local/nagios/libexec/check_ncpa.py
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: it.centos.contactlab.it
* epel: pkg.adfinis-sygroup.ch
* extras: it.centos.contactlab.it
* remi-safe: mirror.23media.de
* updates: it.centos.contactlab.it
Resolving Dependencies
--> Running transaction check
---> Package dos2unix.x86_64 0:3.1-37.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================
Package Arch Version Repository Size
============================================================================================================================================
Installing:
dos2unix x86_64 3.1-37.el6 base 16 k

Transaction Summary
============================================================================================================================================
Install 1 Package(s)

Total download size: 16 k
Installed size: 18 k
Downloading Packages:
dos2unix-3.1-37.el6.x86_64.rpm | 16 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : dos2unix-3.1-37.el6.x86_64 1/1
Verifying : dos2unix-3.1-37.el6.x86_64 1/1

Installed:
dos2unix.x86_64 0:3.1-37.el6

Complete!
dos2unix: converting file /usr/local/nagios/libexec/check_ncpa.py to UNIX format ...
[root@tc-monitor ~]# /usr/local/nagios/libexec/check_ncpa.py -H 10.1.3.4 -t mytoken -M 'memory/virtual/percent' -vvv
Connecting to: https://10.1.3.4:5693/api/memory/virtua ... lt&check=1
File returned contained:
{
"returncode": 0,
"stdout": "OK: Percent was 45.90 % | 'percent'=45.90%;;;"
}
OK: Percent was 45.90 % | 'percent'=45.90%;;

Now I have another question about check command syntax.
As you can see in the attached screen capture probably there's something wrong in the definition service I wrote in Nagios Config file:

define service{
use generic-service
host_name ftp-server
service_description Disk Usage
check_command check_ncpa!-t 'mytoken' -P 5693 -M disk/logical/C:| -w 80 -c 90
}

My goal is to monitor all disk partitions and send an alert message when 80% of disk usage is reached or a critical alert when 90% of disk usage is reached.

Thank you for your patient!

I am glad I could help, cerino! For the second problem, try changing this:

define service{
use generic-service
host_name ftp-server
service_description Disk Usage
check_command check_ncpa!-t 'mytoken' -P 5693 -M disk/logical/C:| -w 80 -c 90
}

to this:

define service{
use generic-service
host_name ftp-server
service_description Disk Usage
check_command check_ncpa!-t 'mytoken' -P 5693 -M 'disk/logical/C:|/used_percent' -w 80 -c 90
}

Let me know if this helped.

...now is in UNKNOWN Status, as you can see.

Can you run the following commands from the command line on the Nagios server, and show the output?
Also, show us the service definition of the "Disk Usage" service on the "ftp-server" host. Thanks!