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Add iptables to your node-exporter metrics

Posted on 2025-12-012025-10-25 By rolfje No Comments on Add iptables to your node-exporter metrics

This time quick and simple trick to make your node_exporter report on the number of blocked and allowed packets by iptables. It involves a tiny script, and a small configuration change to the node_exporter. Here we go:

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Software

Finding HomeAssistant Entities in Prometheus

Posted on 2025-11-09 By rolfje No Comments on Finding HomeAssistant Entities in Prometheus

Juggling entities in HomeAssistantWhen you install the prometheus addon in HomeAssistant, it can be strange to see that the metrics do not show up in your Grafana dashboard. That is because the entity names are part of the labels, not of the metric name.

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Uncategorized

Querying Classicpress database for page hits

Posted on 2025-11-012025-10-21 By rolfje No Comments on Querying Classicpress database for page hits

Now that I am running classicpress, I miss the statistics that I received at wordpress.org. I don’t want to install third party cookies or other adware stuff, so I was looking to see how to solve that completely locally. Here’s how I got it working, withouts ads, all local, for free.

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Software, Uncategorized

Gardena Sileno verbindingsprobleem opgelost

Posted on 2025-10-202025-10-21 By rolfje No Comments on Gardena Sileno verbindingsprobleem opgelost

In de zomer groeit gras als een malle. Eigenlijk zou je 2 a 3x per week moeten maaien als je het mooi wil houden, en met een kooimaaier wordt dat al snel klusje dat je uitstelt of overslaat. Dus kochten we een prachtige robotgrasmaaier van Gardena: De Sileno City met LONA technologie (daarmee maakt hij een mooie kaart van je tuin die je ziet in de app op je telefoon).

Bij het installeren meldde hij dat het lussignaal en de geleidingsdraad niet waren gevonden, ook al stond hij in de lader en was alles correct aangesloten (groen lampje in de lader). In deze post leg ik uit waar dat door (kan) komen en welke oplossing NIET in hoofdstuk 6 “Probleemoplossingen” in het boekje staat.

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Warmtestore review

Posted on 2024-12-302025-10-18 By rolfje No Comments on Warmtestore review

VuurtjeToen we een huis kochten met een open haard, was ik super enthausiast. Een vuurtje stoken was al snel gedaan en het oogt en ruikt fantastisch. Het enige nadeel van een open haard is dat er niet veel warmte vanaf komt: het rendement van een open haard is zo’n 15%. Al snel keken we naar een haard (niet open dus), omdat dat makkelijker stookt, veiliger is, minder rook en stank produceert, en niet onbelangrijk: het rendement van een gesloten haard is zo’n 75% tot 85%.

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Remove DataTool Alarm

Posted on 2024-09-012025-10-17 By rolfje No Comments on Remove DataTool Alarm

If you have a Triumph Motorcycle and the Datatool evo, S3 or S4 alarm gives you headaches, there are two things to know:

  1. The alarm is virtually irrepairable because it is filled with silicone
  2. There is an easy trick to remove/disable it without permanent damage to the bike or the alarm.

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Electronics, Hardware, Racing, Workshop

Apple Watch 8 Uninstalled

Posted on 2023-12-062025-10-17 By rolfje No Comments on Apple Watch 8 Uninstalled

apple watch After wearing a simple Pulsar analog watch for years, and then not wearing a watch at all, I convinced myself a month ago that an Apple Watch 8 would be an improvement. Part of that decision was based on my hipster IT colleagues being surprised I was not wearing a smartwatch. I also noticed my girlfriend practically can’t live without hers, and then I saw this endless stream of youtube videos with raving reviews of (lets be honest) pretty biased people.

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Apple, Hardware, Uncategorized

Salarisverhoging Leraren Basisschool

Posted on 2022-04-242025-10-17 By rolfje No Comments on Salarisverhoging Leraren Basisschool

Ben je leraar in het basisonderwijs en wil je weten wat je nieuwe salaris wordt nu er een akkoord is over het dichten van de salariskloof tussen het PO (Primair Onderwijs / basisonderwijs) en het VO (Voortgezet Onderwijs)? Aan de hand van de huidige salarisschalen voor PO, salarisschalen voor VO, en de uitleg van de Algemene Onderwijsbond kom ik op onderstaande nieuwe schalen, treden en salarissen.

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Uncategorized

Exit WordPress

Posted on 2022-01-302025-10-17 By rolfje 1 Comment on Exit WordPress

For years I have happily used WordPress.org to host my blog. I enjoyed writing articles, helping and interacting with people who take the time to read the longform articles. For a whole slew of reasons my attention to my blog decreased to almost zero. One of the big parts in that is the “Gutenberg Editor” or the “Block Editor” which suddenly appeared in WordPress. It made writing blogposts a horrible, cumbersome experience. Another frustration was the breaking of layouts of old posts because of “upgrades” to the theme I am using.

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Uncategorized

When munin df does not list all disks

Posted on 2021-05-232025-11-13 By rolfje No Comments on When munin df does not list all disks

I am a great fan of using munin for monitoring my servers and I have quite an extensive setup that even sends me Telegram messages when something is wrong.

This weekend I ran into an interesting problem with a backupserver where the ‘df’ plugin on the node did not want to list the backup disk, and I’ve spent quite some time trying to figure out what the problem was.

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Software

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