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[Solved] Installed NRPE on Nagios-port 5666 connect refused
Posted: Wed Jul 30, 2014 10:50 pm
by jbruyet
Hey all, I just built a Nagios server and I can bring up the web page and see that my server is doing well. I installed NRPE and for some reason I can't get NRPE working. Here's what I'm seeing when I test NRPE (.7 is my Nagios server):
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[root@Nagios nrpe-2.15]# /usr/local/nagios/libexec/check_nrpe -H 192.168.1.7
connect to address 192.168.1.7 port 5666: Connection refused
connect to host 192.168.1.7 port 5666: Connection refused[root@Nagios nrpe-2.15]#
I thought it might be a firewall issue but:
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[root@Nagios nrpe-2.15]# getenforce
Disabled
[root@Nagios nrpe-2.15]# service iptables status
iptables: Firewall is not running.
[root@Nagios nrpe-2.15]#
There must be something going on because when I hit it with NMAP:
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Nmap scan report for 192.168.1.7
Host is up (0.00022s latency).
PORT STATE SERVICE
5666/tcp closed nrpe
Any ideas on what else it might be?
Thanks,
Joe B
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Thu Jul 31, 2014 8:27 am
by eloyd
Your nmap result of "closed" means it can't connect. I'd start to make sure that it's actually listening:
(Assuming you have lsof installed. If not, install it from wherever you install stuff from).
Are you running NRPE out of xinetd or as a standalone daemon? That will make a difference in troubleshooting, but if it's xinetd, make sure your config file looks very similar to this:
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# cat /etc/xinetd.d/nrpe
# 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 = 192.168.1.1 10.1.1.1 other.ip.goes.here
}
It's that "only_from" line that most people miss. It's a space-separated list of IP addresses (or names) that you are allowed to connect from.
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Thu Jul 31, 2014 6:12 pm
by jbruyet
Wow, strike one and strike two:
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[root@Nagios jobee]# lsof -i:5556
[root@Nagios jobee]#
[root@Nagios jobee]# cat /etc/xinetd.d/nrpe
cat: /etc/xinetd.d/nrpe: No such file or directory
[root@Nagios jobee]#
Thanks,
Joe B
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Thu Jul 31, 2014 6:36 pm
by eloyd
Well there's your problem - you typed what I told you too!!!
It's not 5556, it's 5666.
Let's see what that does!
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Tue Aug 05, 2014 10:44 pm
by jbruyet
Ok, back from a vacation spoiling nieces and nephews.
LOL, I should have looked a little closer. Here's my result:
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[jobee@Nagios ~]$ lsof -i:5666
[jobee@Nagios ~]$
Thanks,
Joe B
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Tue Aug 05, 2014 10:54 pm
by eloyd
So it looks like NRPE is not actually running. Which may explain why it's hard to connect to it.
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Wed Aug 13, 2014 9:00 am
by tmcdonald
jbruyet, did you get NRPE working?
Re: Installed NRPE on Nagios server port 5666 connection ref
Posted: Sat Sep 20, 2014 10:17 pm
by jbruyet
Sorry everyone, I just found this open thread. Yes I did get it working; Nuke and Repopulate is an extreme yet highly effective maneuver. Thanks for all the help!
Thanks,
Joe B