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Issues with Nagios NRPE monitoring (Return code of 127 is out of bounds - plugin may be missing)
Hello,
I'm at my wits' end trying to fix my Nagios server's issue. I've followed the NRPE documentation closely, but I'm still getting this same error: (Return code of 127 is out of bounds - plugin may be missing) in the Nagios web service. When I run the command
My setup is a LAN virtualized using VMWare Workstation. The monitoring and monitored machines are connected through a LAN segment, both running the latest version of CentOS 6.
Config files in regards to NRPE are as follows:
linux.cfg
commands.cfg
remote host side
/etc/xinetd.d/nrpe
nrpe.cfg
I'm at my wits' end trying to fix my Nagios server's issue. I've followed the NRPE documentation closely, but I'm still getting this same error: (Return code of 127 is out of bounds - plugin may be missing) in the Nagios web service. When I run the command
/usr/local/nagios/libexec/check_nrpe -H 10.254.1.2 -c check_load
My setup is a LAN virtualized using VMWare Workstation. The monitoring and monitored machines are connected through a LAN segment, both running the latest version of CentOS 6.
Config files in regards to NRPE are as follows:
linux.cfg
define host{
use remote-linux-server ; Name of host template to use
; This host definition will inherit all variables that are defined
; in (or inherited by) the linux-server host template definition.
host_name linux
alias Linux Server
address 10.254.1.2
}
define service{
use generic-service ; Name of service template to use
host_name linux
service_description CPU Load
check_command check_nrpe!check_load
}
define hostgroup{
hostgroup_name remote-linux-servers ; The name of the hostgroup
alias Remote Linux Servers ; Long name of the group
members linux ; Comma separated list of hosts that belong to this group
}
define service{
use generic-service
host_name linux
service_description Ping
check_command check_ping!100.0,20%!500.0,60%
}
commands.cfg
define command{
command_name check_nrpe
command_line USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}
remote host side
/etc/xinetd.d/nrpe
service nrpe
{
flags = REUSE
socket_type = stream
port = 5666
wait = no
user = nagios
group = nagios
server = /usr/local/nagios/bin/nrpe
server_args = -c /usr/local/nagios
no
only_from = 10.254.1.1
}
nrpe.cfg
log_facility=daemon
pid_file=/var/run/nrpe.pid
server_port=5666
nrpe_user=nagios
nrpe_group=nagios
allowed_hosts=127.0.0.1,10.254.1.1
dont_blame_nrpe=0
debug=0
command_timeout=60
connection_timeout=300
command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/hda1
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200
IT Administration
Last Comment
Sanga Collins
ASKER
I seem to have made a mistake pasting that file...
Correct version is as follows:
service nrpe
{
flags = REUSE
socket_type = stream
port = 5666
wait = no
user = nagios
group = nagios
server = /usr/local/nagios/bin/nrpe
server_args = -c /usr/local/nagios/etc/nrpe
log_on_failure += USERID
disable = no
only_from = 10.254.1.1
}
Correct version is as follows:
service nrpe
{
flags = REUSE
socket_type = stream
port = 5666
wait = no
user = nagios
group = nagios
server = /usr/local/nagios/bin/nrpe
server_args = -c /usr/local/nagios/etc/nrpe
log_on_failure += USERID
disable = no
only_from = 10.254.1.1
}
Ok cool, The error message you are getting usually means the plugin is not in the right place. When you say you ran the command from the terminal, was this on the nagios server or on the remote server to be monitored?
When faced with the same problem (seems to happen everytime i install NRPE) I usually start on the remote server and work my way backwards.
i) can command be executed on remote server command line and return correct results?
ii) can command be executed on nagios server and return correct results?
iii) if ii) = no can any command at all be called from nagios server?
When faced with the same problem (seems to happen everytime i install NRPE) I usually start on the remote server and work my way backwards.
i) can command be executed on remote server command line and return correct results?
ii) can command be executed on nagios server and return correct results?
iii) if ii) = no can any command at all be called from nagios server?
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James Murphy
ASKER
i) yes
ii) yes
iii) I can perform a ping command successfully and it is displayed in the web interface, just not things related to check_nrpe
ii) yes
iii) I can perform a ping command successfully and it is displayed in the web interface, just not things related to check_nrpe
OK, I'm assuming you are running the commands as root account. If so, what is the result if you run the command as the nagios user on the remote server.
# su nagios
# /usr/local/nagios/libexec/
# su nagios
# /usr/local/nagios/libexec/
ASKER
Result seems good:
OK - load average: 0.30, 0.09, 0.03|load1=0.300;15.000;30
OK - load average: 0.30, 0.09, 0.03|load1=0.300;15.000;30
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ok wow!
Next thing I look at is the nrpe.cfg in /etc/nagios ;
In mine, line 11 only the ip address of my nagios server as follows
allowed_hosts=192.168.50.9
instead of ...
allowed_hosts=127.0.0.1,19
Next thing I look at is the nrpe.cfg in /etc/nagios ;
In mine, line 11 only the ip address of my nagios server as follows
allowed_hosts=192.168.50.9
instead of ...
allowed_hosts=127.0.0.1,19
ASKER
Doesn't seem to be changing anything, even after restarting nagios and xinetd services in their respective hosts.
ASKER CERTIFIED SOLUTION
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God bless you, it works now!
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William Peck
Fantastic! It's always the little things that get me too!
# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
flags = REUSE
socket_type = stream
port = 5666
wait = no
user = nagios
group = nagios
server = /usr/sbin/nrpe
server_args = -c /etc/nagios/nrpe.cfg --inetd
log_on_failure += USERID
disable = no
only_from = 127.0.0.1, 192.168.50.96
}