Nagios Support Forum

All,

I have a RHEL 6.3 server that is registered with red hat. I've installed the nagios plugins(2.0.3) and the nrpe-2.15.

When I run the following command, netstat -at | grep nrpe I get nothing.

When I run the following command, /usr/local/nagios/libexec/check_nrpe -H localhost I get:

connect to address ::1 port 5666: Connection refused
connect to address 127.0.0.1 port 5666: Connection refused
connect to host localhost port 5666: Connection refused

When i do a less /var/log/messages I get the following:

Sep 11 09:06:03 localhost xinetd[46274]: Server /usr/local/nagios/bin/nrpe is not executable [file=/etc/xinetd.d/nrpe] [line=11]
Sep 11 09:06:03 localhost xinetd[46274]: Error parsing attribute server - DISABLING SERVICE [file=/etc/xinetd.d/nrpe] [line=11]
Sep 11 09:06:03 localhost xinetd[46274]: Must specify a server in nrpe
Sep 11 09:06:03 localhost xinetd[46274]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in.
Sep 11 09:06:03 localhost xinetd[46274]: Started working: 0 available services
Sep 11 09:07:48 localhost xinetd[46274]: Exiting...

When I run a ps -ef |grep xinetd, I get:

root 5107 1 0 09:26 ? 00:00:00 xinetd -stayalive -pidfile /var/run/xinetd.pid
root 32359 13266 0 09:54 pts/0 00:00:00 grep xinetd

I've restarted the xinetd process multiple times

When I run grep nrpe /etc/services I get:

nrpe 5666/tcp # NRPE

I added port 5666 to the iptables:

*filter
:INPUT ACCEPT [368773:68873995]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [372083:68473830]
-A INPUT -p tcp -m tcp --dport 5666 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 5666 -j ACCEPT
COMMIT
# Completed on Thu Sep 11 09:21:53 2014


My /etc/xinetd.d/nrpe configuration file looks like this:

# 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/local/nagios/bin/nrpe
server_args = -c /usr/local/nagios/etc/nrpe.cfg --inetd
log_on_failure += USERID
disable = no
only_from = 192.168.0.29
}

I've also tried adding in the 127.0.0.1 in the only_from field and I get the same problem.

I've setup nrpe on a few centos and SUSE servers and have never had this issue. I'm totally stumped at this point. Any help would be much appreciated

Is xinetd running?
You're looking for "3:on"

Yes, it looks like it:


chkconfig --list xinetd
xinetd 0:off 1:off 2:off 3:on 4:on 5:on 6:off

Okay, that's good. Next, let's make sure stuff is listening. If you have lsof installed, use it: If you don't have it installed, install it:

lsof -i:5666, i get nothing.

i ran the install and it says it's already installed.

>yum -y install lsof
Loaded plugins: product-id, security, subscription-manager
This system is receiving updates from Red Hat Subscription Management.
rhel-6-server-rpms | 3.7 kB 00:00
Setting up Install Process
Package lsof-4.82-4.el6.x86_64 already installed and latest version
Nothing to do

You should see something like this: If you do not, then xinetd is not properly configured to run NRPE or else xinetd is not started. Try: and then the to see if that helps.

Still no response from lsof -i:5666

service xinetd stop
Stopping xinetd: [ OK ]
[root@ ~]# service xinetd start
Starting xinetd: [ OK ]
[root@ ~]# lsof -i:5666
[root@ ~]#

Then something is wrong with xinetd. I have meetings to go to, but may be able to return to this by the end of the day.

Ok. Thanks for your help!

Is /usr/local/nagios/bin/nrpe executable? Should look something like this: (sizes and dates will be different on yours)

(i'm not sure you really need to give execute to group/world, 700 may work fine)

You may have some config you need to do in /usr/local/nagios/etc/nrpe.cfg too, but I expect it's the not executing issue that's stopping you at the moment.