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PacPong – The Game

PacPong – The Game

Inspired by a T-shirt as sold by Okimono.nl, I created a playable version of the game as depicted on their T-shirt. It is a cross-over between Pac-Man and Pong. Pac-Man became 40 this year!

Send new created Jira ticket info to MS-Teams Channels

Send new created Jira ticket info to MS-Teams Channels

Summary We are using (self hosted) Jira (the Atlassian Issue Tracker / Scrum / Kanban Board) at the office. And we wanted to receive a chat notification for each newly created ticket, to be received in Microsoft Teams Channels. Teams is a collaboration messenger tool like Slack or RocketChat. Jira can send new ticket/story creations using a web-hook to external tools. The web-hook sends a Jira specific JSON payload, no configuration options possible. The project you are looking at, consists…

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WiFi 240V AC Led Dimmer – Speech Controlled

WiFi 240V AC Led Dimmer – Speech Controlled

I wanted to build my own WiFi dimmer, to connect my dinner table lights to Alexa (Amazon Echo Dot). The used parts are an ESP8266 (I used a Wemos D1 Mini Clone), an ATTiny45, some sort of power module to supply 3.3 volt, and a zero-cross-detector / Triac dimmer module.

Fluent Bit Elastic Search Data Type Filter

Fluent Bit Elastic Search Data Type Filter

Summary I have created a Fluent Bit LUA Filter to force proper data types to be send to our Elastic Search (log collector) Database, to prevent Elastic from rejecting the log records. GitHub Project: https://github.com/atkaper/fluent-bit-lua-filter-elastic-data-types Environment We are running a bunch of (on premise) Kubernetes clusters, all having around 20 nodes, with many deployments on it. The deployments use different technologies; Java, Kotlin, Node.js, GO, Python, C, … and quite some standard open source applications. Most of them have been…

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K8S Tiller/Helm History Cleanup

K8S Tiller/Helm History Cleanup

GitHub Project: https://github.com/atkaper/k8s-tiller-history-cleanup Introduction In our on premise Kubernetes cluster, we use Helm for a big part of our application / micro-services deployments. Helm uses an engine called Tiller (which is a deployment in the cluster). It executes the installs / updates / deletes, and it stores the results of deployments in the system as config maps. While migrating our applications to a new K8S cluster, we saw that we forgot to set a limit on the history which is…

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WordPress Plugin – Meta Robots

WordPress Plugin – Meta Robots

Mini project of the day… I did create a tiny WordPress plugin, to add a meta robots header to some of my pages, to prevent them from being indexed by google and other search engines. So without further ado, here’s the source code, to be put in a file: wp-content/plugins/meta-robots/meta_robots.php in your WordPress installation folder: After adding this code, go to your plugin configuration, and enable the plugin. It should show up in the list automatically. To enable the header,…

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K8S Check Certificate Chains

K8S Check Certificate Chains

Github Project: https://github.com/atkaper/k8s-check-certificate-chains Ingress/nginx (running in Kubernetes / K8S) does not like silly certificates, therefore I created two scripts to find wrong ones. The script get-all-k8s-certificates.sh retrieves all certificates from kubernetes, and the check-certificate-chains.sh script verifies the chain’s are complete and in proper ordering. Added md5 hash check on crt and key file to verify the two belong to each other. The check-certificate-chains.sh just reports on WRONG certificates. Run with “-v” option to also show OK’s. Thijs.