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NRPE plugins return null
Posted: Thu Oct 08, 2015 5:03 am
by peterg
Got a strange problem with a stock installation of Nagios with NRPE for remote monitoring, all the packages are from Ubuntu repositories. It's Ubuntu 14.04.3 LTS on the server side with the 12.04.5 LTS clients.
If I run the check on the server as my user id, nagios or root it works perfectly:
Code: Select all
ubuntu@nagios01:~$ /usr/lib/nagios/plugins/check_nrpe -H 10.99.1.6 -c check_users
USERS OK - 1 users currently logged in |users=1;5;10;0
However, in Nagios the service status is 'WARNING' and the Status Information field is '(null)' for all my nrpe checks. Localhost checks, ping and SSH remote checks are fine but they don't use nrpe. The log file doesn't record anything for the nrpe checks.
Any clues how I can debug this further?
Pete
Re: NRPE plugins return null
Posted: Thu Oct 08, 2015 12:45 pm
by hsmith
Can you post some of the service definitions that are having issues?
You can find these in /usr/local/nagios/etc/objects in most installs.
Re: NRPE plugins return null
Posted: Fri Oct 09, 2015 4:54 am
by peterg
Sure, this is from /etc/nagios/nrpe_local.cfg
Code: Select all
$ more /etc/nagios/nrpe_local.cfg
######################################
# Do any local nrpe configuration here
######################################
command[check_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_all_disks]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10%
command[check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib/nagios/plugins/check_procs -w 150 -c 200
command[check_swap]=/usr/lib/nagios/plugins/check_swap -w 20 -c 10
Is that what you meant?
Thanks for your help, Pete
Re: NRPE plugins return null
Posted: Fri Oct 09, 2015 9:48 am
by hsmith
I'm looking for the service checks that you set up inside of Nagios.
/usr/local/nagios/etc/objects should have some files in there that you configured for service checks.
For instance, I have some services defined inside of /usr/local/nagios/etc/objects/services.cfg on my core machine.
Re: NRPE plugins return null
Posted: Mon Oct 12, 2015 6:36 am
by peterg
I checked all the nagios packages on the server, the only package that contains objects was nagios3-common:
Code: Select all
$ dpkg -L nagios3-common | grep object
/usr/share/doc/nagios3-common/examples/template-object
/usr/share/doc/nagios3-common/examples/template-object/README
/usr/share/doc/nagios3-common/examples/template-object/localhost.cfg.gz
/usr/share/doc/nagios3-common/examples/template-object/timeperiods.cfg
/usr/share/doc/nagios3-common/examples/template-object/commands.cfg
/usr/share/doc/nagios3-common/examples/template-object/printer.cfg
/usr/share/doc/nagios3-common/examples/template-object/templates.cfg.gz
/usr/share/doc/nagios3-common/examples/template-object/windows.cfg
/usr/share/doc/nagios3-common/examples/template-object/switch.cfg
/usr/share/doc/nagios3-common/examples/template-object/contacts.cfg
... where they are just templates.
On the client, there's no objects.
What are they and could the fact they're missing be the root of the problem?
FYI, just had a thought that apparmor might be a cause, disabled it, no difference.
Pete
Re: NRPE plugins return null
Posted: Mon Oct 12, 2015 12:31 pm
by hsmith
Let's not worry about objects for now. I just need the command/service that you set up for one of your check_nrpe checks that is failing. It will look something like this:
Code: Select all
define service{
host_name linux-server
service_description check-disk-sda1
check_command check-disk!/dev/sda1
max_check_attempts 5
check_interval 5
retry_interval 3
check_period 24x7
notification_interval 30
notification_period 24x7
notification_options w,c,r
contact_groups linux-admins
}
Re: NRPE plugins return null
Posted: Tue Oct 13, 2015 9:01 am
by peterg
Ok, here's an example check on the nagios server (from
/etc/nagios3/conf.d/clients.cfg):
Code: Select all
define command {
command_name check_load_nrpe
command_line $USER1$/check_nrpe -H "$HOSTADDRESS" -c "check_load"
}
...
define service {
use gs-generic-service
host_name cogs.example.com
service_description Load check NRPE
check_command check_load_nrpe
}
is defined in
/etc/nagios3/resource.cfg as
$USER1$=/usr/lib/nagios/plugins
and on the monitored server (from
/etc/nagios/nrpe_local.cfg):
Code: Select all
######################################
# Do any local nrpe configuration here
######################################
command[check_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_all_disks]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10%
command[check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib/nagios/plugins/check_procs -w 150 -c 200
command[check_swap]=/usr/lib/nagios/plugins/check_swap -w 20 -c 10
Hopefully I've not missed anything.
Pete
Re: NRPE plugins return null
Posted: Tue Oct 13, 2015 1:11 pm
by hsmith
Can I see what is in gs-generic-service?
Re: NRPE plugins return null
Posted: Tue Oct 13, 2015 8:13 pm
by Box293
peterg wrote:If I run the check on the server as my user id, nagios or root it works perfectly:
Code: Select all
ubuntu@nagios01:~$ /usr/lib/nagios/plugins/check_nrpe -H 10.99.1.6 -c check_users
USERS OK - 1 users currently logged in |users=1;5;10;0
However, in Nagios the service status is 'WARNING' and the Status Information field is '(null)' for all my nrpe checks. Localhost checks, ping and SSH remote checks are fine but they don't use nrpe. The log file doesn't record anything for the nrpe checks.
peterg wrote:Code: Select all
define service {
use gs-generic-service
host_name cogs.example.com
service_description Load check NRPE
check_command check_load_nrpe
}
Can you please post the host object defintion for cogs.example.com.
Is the address for cogs.example.com 10.99.1.6 ?
Re: NRPE plugins return null
Posted: Wed Oct 14, 2015 7:00 am
by peterg
hsmith wrote:Can I see what is in gs-generic-service?
Sure:
Code: Select all
define service {
name gs-generic-service
check_interval 10
check_period 24x7
retry_interval 2
max_check_attempts 3
notification_interval 30
notification_period 24x7
notification_options w,c,r
contact_groups admins
}