Install NRPE 3.2.1 on CentOS 7 server

[npolovenko]

@bsivavani

Nondefault paths are because of we installed NRPE using rpm's.

Yes, I believe that's the main problem. Unfortunately, Nagios hasn't yet officially released rpm for NRPE 3.2.1. And because we haven't created that RPM we don't know how the paths were configured. Your best bet would be to go line by line and compare NRPE configs that you have to the corresponding paths on your system.

Cannot write to pidfile '/etc/nagios/nrpe.pid' - check your privileges.

Make sure that you do have /etc/nagios folder on your system. If you don't please create it:

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mkdir /etc/nagios/

After that assign the permissions:

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chown nagios:nagios /etc/nagios/
chown +x /etc/nagios/

Finally, please restart NRPE with:

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service nrpe restart

[bsivavani]

/etc/nagios already have 777 permissions.

We are planning to install NRPE using rpm's.

Can you let us know what is the official latest release rpm for NRPE ?

[bsivavani]

FYI.. We are using rpm package of version 3.2.0.

[cdienger]

The permissions error is interesting. Does su nagios touch /etc/nagios/nrpe.pid work? Is there nagios user and group in /etc/passwd and /etc/group ?

[bsivavani]

Created the nrpe.pid file using touch, but still seeing the same permission issue.

[root@s93tl3101 system]# cat /etc/group | grep nagios
nagios1002:nrpe
[root@s93tl3101 system]#
[root@s93tl3101 system]# cat /etc/passwd | grep nagios
nagios1002:/home/nagios:/bin/bash
[root@s93tl3101 system]#

Can you let us know what is the latest rpm file which Nagios officially supporting ?

[npolovenko]

@bsivavani, I want to make a correction to my previous post. I spoke with a team and actually, we don't have official rpm's for nrpe. Generally, we try to provide help with rpm's though.
I went ahead and started up a clean Centos 7x64, then I installed the epel-release rpm from the link that you provided:
http://dl.fedoraproject.org/pub/epel/7/ ... noarch.rpm
After that I ran:

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yum install nrpe
yum install nagios-plugins-all -y

I successfully installed nrpe agent and plugins and the nrpe daemon is now active.

I think you may have installed nrpe agent 2 times. First time using a regular install and that's why systemd daemon is starting, and the second time you actually installed it with the RPM, which uses nagios service. That's why the system can't assign the pid file to the nagios service because it's already in use by systemd.
My recommendation is to start all over, wipe the system if possible, or revert a VM to a previous snapshot.

[bsivavani]

Hi,

We tried in fresh server and able to run the nrpe using systemctl, but we are seeing below issue while running the CPU plugin.

/usr/local/nagios/libexec/check_nrpe -H lbXXXXX.rwest.local -t 30 -c check_cpu_stats1 -a "-Iw 20 -Ic 10"
OUTPUT: NRPE: Unable to read output

Plugin permissions
[root@givemeaname plugins]# ls -l /usr/lib64/nagios/plugins/check_cpu_stats1.sh
-rwxrwxrwx. 1 root root 14624 Mar 23 2016 /usr/lib64/nagios/plugins/check_cpu_stats1.sh
[root@givemeaname plugins]#

Attached nrpe.cfg file.

Kindly advice ?

[npolovenko]

@bsivavani, Does the plugin work without nrpe with the supplied arguments?

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cd /usr/lib64/nagios/check_cpustats1.sh 
./check_cpu_stats1 -Iw 20 -Ic 10

Do other plugins work fine? Let's test the nrpe connection:
On Nagios server please navigate to:
/usr/local/nagios/libexec/
and run:

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./check_nrpe -H lbXXXXX.rwest.local 

*Replace the host value with the correct one.

Now, as far arguments go, please try the the following command:

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/usr/local/nagios/libexec/check_nrpe -H lbXXXXX.rwest.local -t 30 -c check_cpu_stats1 -a "-w 20 -c 10"

PS: Can you share a link to download this plugin?

[bsivavani]

Hi,

After rebooting the server, we were able to get the output.

Thanks for your help.

[tmcdonald]

Great to hear! Mind if we close this up?