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A minimum complete tutorial of Linux ext4 file system (2017)
This is a complete tutorial for understanding the basics of Linux ext4 file system.
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Ok, Cloudflare I am leaving
Music and blogging
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789 KB Linux Without MMU on RISC-V
A guide on building a tiny Linux (only 789 KB) that requires no MMU and deploying it on a RISC-V system, with custom userspace code.
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Notes on running a single-person Mastodon server
Notes on using a single-person Mastodon server
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Building a freedom-friendly WiFi pocket-router (2020)
Daniel Kulesz's personal website
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In Praise of Alpine and APK
Since the change of year, I’ve been using Alpine Linux on my main computing device (a new desktop PC that I assembled in December). These are some notes on in, some niceties and caveats.
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GitHub Actions Are a Problem
A blog, mostly about programming
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My 2023 all-flash ZFS NAS (Network Storage) build
For over 10 years now, I run two self-built NAS (Network Storage) devices which serve media (currently via Jellyfin) and run daily backups of all my PCs and servers. In this article, I describe my goals, which hardware I picked for my new build (and why) and how I set it up.
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Keycloak with PostgreSQL on Kubernetes
In this article we will learn how to deploy Keycloak with PostgreSQL on Kubernetes. We will first do everything manually with separate YAMLs and then later with Helm. Our k8s environment will run i…
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Don't let event-driven architecture buzzwords fool you
I see a lot of new terms like Command-Event, Event-Based Compute, etc., presented around Event-Driven Architecture. Let me clear that up because there are no such things…
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You can serve static data over HTTP
This will be short. I need to let some steam off and flush this thing out of my mind because it's already hanging around for too long. The story goes like this: we're prototyping small tool for whatever and we're at the point where there is a visible need to store some (most likely) static data. Oh, the thing is in…
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Why cloud bandwidth is so obscenely expensive and what you can do about that
This article is an excerpt of my new book Cloudflare for Speed and Security where you will learn, among other things, how networking works in order to create fast, secure and scalable applications. If you are not overspending on compute (like many companies do because of "scale") then your biggest
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Honey, I shrunk the NPM package
Have you ever wondered what lies beneath the surface of an npm package? At its heart, it’s nothing more than a gzipped tarball. Working in software development, source code and binary artifacts are nearly always shipped as .tar.gz or .tgz files. And gzip compression is supported by every HTTP server and web browser…
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The Amazon Prime Day 2023 AWS Bill
How much would AWS cost for Amazon Prime Day? Here's Corey Quinn's best guess at the company's AWS bill for the two-day shopping event.
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Problems with AWS Amplify and its use of DynamoDB
Something something Amplify is bad
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The new local data stack: Integrating Dagster, dbt and DuckDB
Lean and efficient MDS experience: Delivers better software engineering practices to the data ecosystem with the new local MDS stack comprised of Dagster, dbt and DuckDB which offers better developer productivity by enhancing testability of the E2E pipeline.
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Jails on FreeBSD
We have had Jails on FreeBSD since 4.0 came out 19 years ago in March 2000. This describes how to setup jails on FreeBSD 12 without any helpers.
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FreeBSD Bhyve Virtualization
The Bhyve FreeBSD hypervisor (called/spelled ‘beehive’ usually) was created almost 10 years ago. Right now it offers speed and features that other similar solutions provide – such…
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Could we stop Yellowstone from erupting with a geothermal power plant?
It’s become fairly common knowledge that Yellowstone National Park, in addition to being incredibly beautiful, is sitting on top of an enormous supervolcano that catastrophically erupts every few hundred thousand years.
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Current architectural best practices for LLM applications
In this guide, I will share the standard architecture for data-informed language model applications and explain forthcoming improvements in knowledge retrieval.
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Graceful behavior at capacity
Suppose we’ve got a service. We’ll gloss over the details for now, but let’s stipulate that it accepts requests from the outside world, and takes some action in response. Maybe those requests are HTTP requests, or RPCs, or just incoming packets to be routed at the network layer. We can get more specific later. What…
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Fighting API bots with Cloudflare's invisible turnstile
There's a "hidden" API on HIBP. Well, it's not "hidden" insofar as it's easily discoverable if you watch the network traffic from the client, but it's not meant to be called directly, rather only via the web app. It's called "unified search" and it looks
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eBPF Networking Techniques – Packet Redirection
This is the first post of a many planned to shed light on the various networking techniques eBPF makes available to a Linux network developer.
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ThinkPad as a Server: The Follow-Up
The ThinkPad as a server is back, this time with a couple of adjustments.
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Service mesh use cases (2020)
Service mesh is a blazing hot topic in software engineering right now and rightfully so. I think it’s extremely promising technology and I’d love to see it widely adopted (in cases where it truly makes sense). Yet it remains shrouded in mystery for many people and even those who are familiar with it have trouble…
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I've had bad luck with transparent hugepages on my Linux machines
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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GitHub Actions and vanity metrics
The measure of a modern software engineer in our attention economy is easily calculable thanks to companies like Microsoft acting both as bastion and companion in demonstrating one's prowess.