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I'm Remy, a developer from The Netherlands with a focus on C++, C, C#, Linux and embedded systems.
I currently work for
To read more or get in touch, click here. This is my personal website, these articles do not reflect or are based on work, opinions or policies of any of my (previous) employers. Any resemblance to reality is pure coincidence.
Bare Metal Vi, boot into Vi without an OS!22-04-2023 22:30 | Remy van Elst
This guide shows you how to run
Vi without an operating system, bare metal. This is a follow up on my article from 2014 where I made a custom linux distro that would Boot to Vim, VIM as PID 1. This time we go further, we boot into
Vi without an operating system. This is made possible by Cosmopolitan, a
libc that outputs a POSIX-approved polyglot format that runs natively on Linux + Mac + Windows + FreeBSD + OpenBSD + NetBSD + BIOS with the best possible performance and the tiniest footprint imaginable.
OpenVMS 9.2 for x86, Installing HAProxy and troubleshooting UNIX file paths19-04-2023 22:30 | Remy van Elst
This article shows you how to install HAProxy on OpenVMS 9.2 for x86. I've often used HAProxy in my career as a sysadmin and find it a very useful tool. HAProxy is an open source, fast, reliable load balancer for TCP and HTTP-based applications. This guide assumes you've set up your OpenVMS system via my guide and the second part of my guide, that will give you a fully licensed OpenVMS installation with networking and SSH access. Since I've used HAProxy so very often to set up high-available clusters and load balancers, I was surprised but happy to see it ported to OpenVMS. This guide shows the setup but also a few OpenVMS specific quirks, like file paths and troubleshooting error messages / logs.Read more...
OpenVMS 9.2 for x86, Getting Started part 3, the WebUI16-04-2023 22:30 | Remy van Elst
OpenVMS on x86 is now available for hobbyists! Almost a year after the official release. This is a part 3 of my getting started guide. Part 2 ended with a working network setup and SSH access. In part 3 we'll do something very exciting, installing the WebUI, a web based management interface for OpenVMS. I'll also share a few smaller tidbits, like how to use the interactive text editor via an
ssh session and how to use
Site update, cookie consent popup (for a static site)Published: 22-03-2023 | Last update: 16-04-2023 19:30 | Author: Remy van Elst
A small site update this time, just to let you know that I've added a cookie consent popup to this static site. If you reject all cookies, you should not see any advertisements and aren't tracked by Google Analytics. It's open source, cookieconsent by Orest Bida.Read more...
OpenVMS 9.2 for x86, Getting Started part 2, auto boot, licenses, PAKs, networking and SSH15-04-2023 22:30 | Remy van Elst
OpenVMS on x86 is now available for hobbyists! Almost a year after the official release. This is a part 2 of my getting started guide. Part 1 ended with an installed system, this part continues with automatic startup, activating the license files (PAKs) and setting up networking including SSH access.Read more...
OpenVMS 9.2 for x86, Getting Started part 1, install guide with VirtualBox11-04-2023 22:30 | Remy van Elst
OpenVMS on x86 is now available for hobbyists! Almost a year after the official release. This is a part 1 of my getting started guide, showing you how to install OpenVMS on VirtualBox on Windows 10/11. More parts will follow, documenting license installation, network setup, ssh, application installation etc.Read more...
OpenVMS 9.2 for x86 is finally available for hobbyists!Published: 09-04-2023 23:59 | Last update: 11-04-2023 22:29 | Author: Remy van Elst
OpenVMS x86 is now available for (most) hobbyists! Almost a year after the official release most hobbyists can now login to the Service Portal to download their copy of OpenVMS 9.2 for x86,
X86E921OE.ZIP and the PAK (license) files (
x86community-20240401.zip), valid until April 2024.
Named Booleans prevent C++ bugs and save you time17-02-2023 20:21 | Remy van Elst
During a recent code review I found a hard to spot bug, a misplaced parenthesis in an
if statement. I often employ a technique I call
named booleans, which would have prevented this bug. It's a simple technique, instead of a long
if statement, give every comparison a seperate boolean variable with a descriptive name and use those variables is the
if statement. This post shows the bug in question, an example of my
named booleans technique and another tip regarding naming magic numbers.
Johnnie 'QObject' Walker, replace a service locator pattern while you're at it14-01-2023 04:30 | Remy van Elst
I've seen many C++ code bases where there was the concept of a service locator. An global static object that anyone can query to get a class. This is handy with old legacy spiderweb intertwined code that gets everything from everywhere, but not so useful when you're trying to unit test code, it is not visible from the header what dependencies you need. My preference goes to dependency injection, give all the dependencies to the class' constructor and use them that way. Makes it easy to mock and if you have many dependencies, it serves as a starting point to refactor in to a more clearly separated architecture. This article shows a piece of code that uses QObject, the Qt object base class, to replace a servicelocator. All QObjects can have a parent QObject, thus a tree is formed, which you can walk back up and search. This effectively replaces the servicelocator, since you can just request a certain type of QObject.Read more...
APT keeps complaining that the HTTPS certificate cannot be validated?11-01-2023 05:31 | Remy van Elst
Recently a few of my Ubuntu 20.04 and Debian 11 servers failed to run an
apt update because it insisted that the HTTPS certificate for a repository could not be validated, while
curl on the same system had no issues connecting. Join me on a deep dive into certificate validation and troubleshooting
apt, digging into the C++ source code for
GnuTLS and in the end, it turned out to be my own fault due to permission on a folder. However, the error messages were totally unhelpful resolving the mysterious validation problem. This article was written over the period of a few days, chronologically during troubleshooting.
Sparkling NetworkPublished: 12-01-2019 | Last update: 08-01-2023 | Author: Remy van Elst
This is an overview of all the servers in the Sparkling Network, mostly as an overview for myself, but it might be interesting for others. It also has a status overview of the nodes. Prices are monthly, excluding VAT.Read more...