Monitoring

LibreNMS 26.6.0 & itable cache directories vntl/var/db/

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I updated my version of LibreNMS to 26.6.0 and there are “decent sized refactor to the rrd processes” – I’m seeing the following: This is an issue with fontconfig The advice I was given: “XDG_CACHE_HOME might help, but I’m not sure if that is the right fix…” I first created a new directory (I’ve since discovered creating the directory is not necessary, adding the configuration item is sufficient): [12:45 besser dvl /var/db/librenms] % […]

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LibreNMS Service health file disabled

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There is no solution here. I’m merely documenting. I use LibreNMS for metrics. Recently, a new item has appeared in the logs: Apr 17 00:00:17 besser librenms[81601]: besser.int.unixathome.org(INFO):Service health file disabled. Checking the code, I found the reference on line 422 of LibreNMS/service.py: Searching for health_file, I found: Which tells me I can set this in my configuration. Searching files: [11:21 besser dvl /usr/local/www/librenms] % grep -ril service_health_file * LibreNMS/service.py app/Console/Commands/HealthCheck.php html/js/lang/en.js lang/en/settings.php

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network connectivity issues – in the #homelab

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Yesterday a big storm came through. Many downed trees (photos here). The power went off at about 0500 and came back again at about 1009, off again at 1309, back at 1319. It was then stable for the rest of the day. Overnight, I saw monitoring alerts which initially made me think there was another power cut. uptime showed that was not the case. I also didn’t see any timeout messages meaning the

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PF states limit reached – on three different host at nearly the same time

Leave a Comment / DNS, FreeBSD, LibreNMS, named, Open Source / By /

What are the chances that three different hosts, in thee different datacenters all display these messages within seconds of each other? The uptimes: [dvl@r720-02:~] $ uptime 1:42PM up 62 days, 15:01, 2 users, load averages: 0.04, 0.12, 0.18 [13:42 tallboy dvl ~] % uptime 1:42PM up 62 days, 15:37, 2 users, load averages: 0.17, 0.37, 0.34 [13:42 zuul dan ~] % uptime 1:42PM up 62 days, 14:56, 2 users, load averages: 0.24, 0.25,

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Optimizing UPS power use when the power goes out

Leave a Comment / Eaton, Network monitoring, nut, UPS / By /

This post is mostly for myself. I’m just putting my Sunday morning thoughts down for later review and consideration. When Selecting replacements batteries for my Eaton 5PX UPS (5PX2200RT & 5PXEBM48RT), I began to think about: when the power goes off, why can’t I keep using my laptop? Usually, I still have an Internet connection: the ISP isn’t going offline. Why not turn off the two servers in the basement, and anything else

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Notes on running net-snmp as non-root

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When feasible, I prefer to run things as non-root. A recent commit to net-snmp has made this possible. By its nature, being a new change, it took me some time and help to figure out what needed to be changed. Before doing this yourself, I recommend waiting until the two code reviews mentioned below are committed. In this post: FreeBSD 14.0-RELEASE-p6 net-snmp-5.9.4_2,1 librenms-24.5.0,1 I include commands from different host; please do not be

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Debugging snmp output when using LibreNMS

Leave a Comment / FreeBSD, LibreNMS, Open Source, ZFS / By /

Librenms is my tool-of-choice for grabbing metrics from switches, servers, wireless access points, and anything else with an snmp interface. In this post: FreeBSD 14.0 LibrenMS 23.11.0,1 – updated to 23.11.0_1,1 within this post net-snmp-5.9.1_4,1 After updating some hosts to FreeBSD 14, the zfs application/extension broke. It was quickly amended after a report was lodged. However, after the fix, I still wasn’t getting graphs. It was nan all across the board for ZFS:

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Nagios 3: moving from nrpe 3 to nrpe 4 – what needs changing?

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Yesterday, I noticed this message in one of the “daily security run output” emails which FreeBSD host can send out. I’ve used net-mgmt/nrpe3 for several years. It checks remote hosts and runs any number of predetermined commands and returns the results. It’s stable, highly configurable, and just keeps running. I had a look at the replacement (net-mgmt/nrpe) and decided to build and install it. First, it went onto my poudriere package bulding host

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Monitoring FreeBSD jails from the host

Leave a Comment / FreeBSD, Jails, Nagios, Network monitoring, nrpe / By /

It was May 2021 when I tweeted about monitoring FreeBSD jails which had jail IP addresses only in the 127.0.0.0/8 range. Yesterday, nearly 6 months later, I did the first test of this. This came up because I’m getting a new FreshPorts node ready. I’ve created a file in the jail to be run from the host. That script runs in the jail but it initiated by a process on the host. In

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Eaton ePDU Auth Algorithm & Crypto Algorithm for SNMPv3 Configuration

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I recently acquired an Eaton EMA114-10 PDU. When adding it to LibreNMS, I did not know what Authorization Algorithm or Crypto Algorithm to use when configuring it for SNMPv3. Searching did not find anything. IRC did. dagb on the LibreNMS IRC channel knew what was used for older EATON devices. Turns out, that hasn’t changed. These are the answers: Auth Algorithm – MD5 Crypto Algorithm – AES I hope this saves you time.

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