Monitoring

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

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

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

5 Comments / Eaton, LibreNMS / By /

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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Recalibrating an APC UPS

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This work was done in August. Since then, I have replaced the APC with an Eaton 5PX, and I am much happier. This might make for interesting reading, but that depends on how bored you are.. Following on from my failed calibration attempts, I thought I would try it again this morning before work. In this post: APC UPS SUA2200RM2U with a AP9619 Network Management card LibreNMS 1.66 FreeBSD 12.1 Before It’s 1132

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Listen queue overflow

Leave a Comment / Network monitoring, Networks / By /

The R720 is showing a message like this from time to time: Jan 1 07:42:20 r720-01 kernel: sonewconn: pcb 0xfffff835e785d5b8: Listen queue overflow: 8 already in queue awaiting acceptance (1 occurrences) Jan 1 08:02:21 r720-01 syslogd: last message repeated 1 times Jan 1 08:27:22 r720-01 kernel: sonewconn: pcb 0xfffff835e785d5b8: Listen queue overflow: 8 already in queue awaiting acceptance (2 occurrences) Jan 1 16:07:04 r720-01 kernel: sonewconn: pcb 0xfffff835e785d5b8: Listen queue overflow: 8 already

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upgrading to LibreNMS 1.53.1

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When upgrading to LibreNMS 1.53.1, your website will not load. You’ll see a message saying check the logs. There will be nothing useful in the logs. I checked. Nothing. This is how I fixed the loading issue. In this post: FreeBSD 12.0 LibreNMS 1.51 running in a jail Upgrading to 1.53.1 First attempts Running as www OK, let’s run that as www. Eh? What? References Searching around, I found nothing useful. I found

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