Remote Monitoring of Linux (Pi) failing

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Junior Member
Posts: 2
Joined: Mon May 03, 2021 2:24 pm

Remote Monitoring of Linux (Pi) failing

Post by p17blo »

RPi 3 B+
NEMS Version 1.5.2

Working my way through adding my clients. I have a number of other RasPis on the network, one that I am particularly interested in is running my DHCP/DNS (PiHole). I have added as a new host and in the services section i have added :
Check CPU Temp
CPU Load
Memory Usage

After adding, HTTP reports OK, but the other 3 are going into an alert status as the NEMS server is being refused connection to obtain the information.

I've then followed the user guide for installing NRPE on the remote box. This ends in an error:

Code: Select all

Switch is up to date (2.17).
Reading '/root/.cpan/Metadata'
  Database was generated on Tue, 04 May 2021 00:17:03 GMT
Set::IntSpan is up to date (1.19).
Reading package lists... Done
Building dependency tree       
Reading state information... Done
git is already the newest version (1:2.20.1-2+deb10u3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Cloning into 'nems-migrator'...
remote: Enumerating objects: 4376, done.
remote: Counting objects: 100% (188/188), done.
remote: Compressing objects: 100% (102/102), done.
remote: Total 4376 (delta 117), reused 143 (delta 85), pack-reused 4188
Receiving objects: 100% (4376/4376), 9.51 MiB | 3.11 MiB/s, done.
Resolving deltas: 100% (2736/2736), done.
Checking out files: 100% (1683/1683), done.
Installing check_wmi_plus... cp: cannot stat '/root/nems/nems-migrator/data/1.6/nagios/plugins/': No such file or directory
cp: cannot stat '/root/nems/nems-migrator/data/1.6/check_wmi_plus': No such file or directory
mkdir: cannot create directory ‘/etc/check_wmi_plus/check_wmi_plus.d’: No such file or directory
chown: cannot access '/etc/check_wmi_plus/': No such file or directory
--2021-05-04 03:16:29--
Resolving (,,, ...
Connecting to (||:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2021-05-04 03:16:30 ERROR 404: Not Found.
However, I continued and editted the file : /usr/local/nagios/etc/nrpe.cfg and permitted the NEMS server.

One of the 'alerts' now stopped reporting that it couldn't connect to get the information (CPU Temp), but all others are still reporting that the connection was refused. They are trying to connect on a different ports to the port that the CPU Temp is connecting to and reporting back OK

Are there more clients needed on the remote PI box to provide this detail back when the NEMS server polls for it?

CPU temp seems to poll port 5666, whereas the others are polling 12489

The nrpe.cfg clearly shows port 5666, there is no documentation to show if you can add the second port (12489). Is there a way to change the port that NEMS polls the remote device for this information? So that is uses port 5666 as it does for the other information?

I can see this has been asked a couple of times before (or something similar), but never a resolution
Junior Member
Posts: 2
Joined: Wed Jul 14, 2021 6:38 pm

Re: Remote Monitoring of Linux (Pi) failing

Post by xanbrennan »

I'm having the same issues.

Did anyone get this sorted?
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