Nagios Monitoring ERROR/BUG

[rmuhammadali]

Dear All,
I found an error while running nagios. The problem arise when i use check_nrpe!check_swap and the output is "(Return code of 255 is out of bounds)" giving status OK. On the other side when i use check_ssh, the output is "connect to address xxx.xxx.xxx.xxx and port 22: No route to host".

Assuming that the remote host is down in this situation. Following are two examples of my nagios service configuration.

define service{
use generic-service
host_name client2
service_description Swap Usage
check_command check_nrpe!check_swap
}

define service{
use generic-service
host_name client2
service_description SSH Monitoring
check_command check_ssh
}

Please help me, how to manage this isue. Snapshot attached.

Regards
RMA

[Box293]

Can you post the command definitions for check_nrpe and check_ssh

[rmuhammadali]

Dear,
Following are my check_nrpe and check_ssh command definations.

define command {
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$
}

define command{
command_name check_ssh
command_line $USER1$/check_ssh $ARG1$ $HOSTADDRESS$
}

Regards
RMA

[Box293]

define command{
command_name check_ssh
command_line $USER1$/check_ssh $ARG1$ $HOSTADDRESS$
}

define service{
use generic-service
host_name client2
service_description SSH Monitoring
check_command check_ssh
}

With the host you are trying to test, in your host definition file is this a DNS name or an IP address?
From the command line of your nagios host can you ping the DNS name or an IP address?

define service{
use generic-service
host_name client2
service_description Swap Usage
check_command check_nrpe!check_swap
}

On your remote host you will have the check_swap command defined in the file /usr/local/nagios/etc/nrpe.cfg OR in the file /usr/local/nagios/etc/nrpe/common.cfg
Is this the case, does an entry for check_swap exist?

Also, have you configured the only_from entry in/etc/xinetd.d/nrpe ?

[rmuhammadali]

/etc/xinetd.d/nrpe Configuration
only from = nagiosserverip

/usr/local/nagios/etc/nrpe.cfg Configuration
command[check_swap]=/usr/local/nagios/libexec/check_swap -w 40% -c 20%

Actually i have down the nrpe client machine to check added monitors.


Regards
RMA

[scottwilkerson]

Can you show the permissions of the check_swap file on the remote system

Code: Select all

ls -l /usr/local/nagios/libexec/check_swap

[rmuhammadali]

Dear,
As i mentioned earlier that assume the remote machine is down, in that case there is nothing concerns with check_swap permissions on remote host. Anyhow the permissions are

Code: Select all

ls -al /usr/local/nagios/libexec/check_swap 
-rwxr-xr-x. 1 root root 141169 Dec 20 11:48 /usr/local/nagios/libexec/check_swap

The question is how to manage "(Return code of 255 is out of bounds)" this error when remote host is down.

Regards
RMA

[abrist]

If the host is down, nrpe should time out, not return 255.

[rmuhammadali]

Dear,
thats the situation, it show
Current Status: OK
Status Information: (Return code of 255 is out of bounds)

Rather then time out or some other status like warning or critical.

Regards
RMA

[rmuhammadali]

Dear,
After keen observation, i found out the following statistics
1) When System is up and running

Code: Select all

[root@nagios myconf]# /usr/local/nagios/libexec/check_nrpe -H 192.168.2.7 -c check_swap
SWAP OK - 100% free (999 MB out of 999 MB) |swap=999MB;399;199;0;999

nrpe SystemUP 1.jpg (11.02 KiB) Viewed 4759 times

2) When System is down manually
First Result

Code: Select all

[root@nagios myconf]# /usr/local/nagios/libexec/check_nrpe -H 192.168.2.7 -c check_swap
CHECK_NRPE: Socket timeout after 10 seconds.

Then on the Second check

Code: Select all

[root@nagios myconf]# /usr/local/nagios/libexec/check_nrpe -H 192.168.2.7 -c check_swap
connect to address 192.168.2.7 port 5666: No route to host
connect to host 192.168.2.7 port 5666: No route to host

nrpe SystemDOWN 1.jpg (10.11 KiB) Viewed 4759 times

Regards
RMA