The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Linux’ Category

I’m not the only one storing tech gadgets in flight cases (:

Posted by jpluimers on 2024/09/05

It was about 2 years ago that Jilles reminded me I had a flight case with gadgets too.

Back when I assembled it in 2018, I had big plans for showing private “cloud” container experimentation and gadget stuff at conferences. Then 2019 kicked in with rectum cancer.

So it was good that he helped me motivating to get it working again, especially as the time around assembling it so much fun and working on it brought back those days.

Here are the pictures:

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Posted in *nix, *nix-tools, Cloud, Cloud Development, Containers, Debian, Development, Docker, GL-AR300M, GL.iNet, Hardware Development, Infrastructure, Kubernetes (k8n), Linux, openSuSE, Power User, Raspberry Pi, Raspbian, Software Development, SuSE Linux | Leave a Comment »

Some notes on codepoints.net and beta.codepoints.net

Posted by jpluimers on 2024/08/07

At the time of writing a lot of this might be more recent, but for quite some time codepoints.net had not been updated with code point information newer Unicode releases.

Basically it was stuck at Unicode version 8.0 with some 120k glyphs. At the time of writing Unicode version 15.0 is in beta and the difference between 15.0 and 8.0 is some 24k glyphs.

So I had a quick twitter chat with the author and jotted down the links in this blog post so I won’t forget them.

There I learned it was open source (I think it is the only Unicode codepoint site that is).

Here it goes:

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Posted in *nix, *nix-tools, Apache2, codepoints.net, Conference Topics, Conferences, Database Development, Debian, Development, DVCS - Distributed Version Control, Encoding, Event, GitHub, Linux, MySQL, PHP, Power User, Scripting, Software Development, Source Code Management, Unicode, Web Development | Leave a Comment »

Need to give this some thought: Poor Man’s Auto Update. by Chris Bensen | by Chris Bensen

Posted by jpluimers on 2024/07/23

Sometimes you need a relatively low-tech solution for updating.

I will need to give this some thought: [Wayback/Archive] Poor Man’s Auto Update. by Chris Bensen | by Chris Bensen | Jun, 2022 | Medium

Back then I posted some edits on Twitter which by now should be reflected in the script and GitHub repository at [Wayback/Archive] chris-blogs/PoorManAutoUpdate.md at main · chrisbensen/chris-blogs (with script at [Wayback/Archive] chris-blogs/updater.sh at main · chrisbensen/chris-blogs)

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Posted in *nix, *nix-tools, cron, Development, Hardware Development, Linux, Power User, Python, Raspberry Pi, Scripting, Software Development | Leave a Comment »

When Ctrl-Alt-Del fails on Linux: Fix a Frozen System with the Magic SysRq Keys (via FOSSwire)

Posted by jpluimers on 2024/04/26

Ctrl-Alt-Del will not safely reboot all systems under all circumstances.

If you run Linux, your keyboard has a magic RysRq key (sometimes not marked, but its the same key as the Print-Scrn key) and the Linux kernel is still running not all is lost.

Due to link rot, the archived links are the most recent that have all the comments for [Wayback/Archive] Fix a Frozen System with the Magic SysRq Keys | FOSSwire which amend

You finally got your Linux environment to crash. Ctrl+Alt+Backspace does nothing, nor do the F-keys. You know you shouldn’t have installed that bad driver, but you did it anyway.
So you reach for the power button.
Stop.
Mashing in the power button to reboot could cause a problem if your hard drive is still being written to, and usually causes more problems than it solves. The Linux kernel includes a secret method of restarting your PC should it ever stop doing its job.
  1. Hold down the Alt and SysRq (Print Screen) keys.
  2. While holding those down, type the following in order. Nothing will appear to happen until the last letter is pressed: REISUB
  3. Watch your computer reboot magically.

This 2007 comment makes it easier to remember: REISUB is the reverse of BUSIER:

R E I S U B – is just the word busier in reverse.

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Posted in *nix, *nix-tools, Hardware, Keyboards and Keyboard Shortcuts, KVM keyboard/video/mouse, LifeHacker, Linux, Power User | Leave a Comment »

iDEAL Beschikbaarheid Dashboard

Posted by jpluimers on 2024/03/25

Voor als iDEAL het niet lijkt te doen kun je meestal de status hier opvragen: [Wayback/Archive] iDEAL Beschikbaarheid Dashboard.

–jeroen

Posted in *nix, LifeHacker, Linux, Monitoring, Power User | Leave a Comment »

Avoid VirtualBox; use Hyper-V or VMware in stead

Posted by jpluimers on 2023/11/10

A while ago, Jilles found out why not to use VirtualBox: [Wayback/Archive] Jilles🏳️‍🌈 on Twitter: “@jpluimers Ik wil op basis van wat de Arch community schreeuwt; “Virtualbox is stom, als je geen hyper-v gebruikt vraag je om problemen”, HYPER-V maar gaan proberen.” / Twitter

The biggest problem is that VirtualBox seems to be developed ant tested for the happy path, not the failing path.

Which means that when you use it for less common scenarios, it will often fail in mysterious ways.

Back in Running ArchiveTeam Warrior version 3.2 on ESXi, I already mentioned this:

Totally agreeing with Kristian Kohntopp, I do not understand why people use VirtualBox at all: I just run in too much issues like [Archive.is] Kristian Köhntopp on Twitter: “Hint: Wenn die Installation einer Linux-Distro in Virtualbox mit wechselnden, unbekannten Fehlern scheitert, hilft es, stattdessen einmal VMware Workstation oder kvm zu probieren. In meinem Fall hat es dann *jedes* *einzelne* *Mal* mit *demselben* Iso geklappt.”.

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Posted in *nix, *nix-tools, ArchiveTeamWarrior, Hyper-V, InternetArchive, Linux, Power User, VirtualBox, Virtualization, VMware, WayBack machine, Windows, Windows 10, Windows 11 | 1 Comment »

Raspberry Pi And The Story Of SD Card Corruption | Hackaday

Posted by jpluimers on 2023/10/02

[Wayback/Archive] Raspberry Pi And The Story Of SD Card Corruption | Hackaday is long and worth reading.

For me the most important bits are how to prevent SD card wear:

  1. use good quality power supplies
  2. put write-heavy operations to SSD
  3. if it suits your use-case, use OverlayFS

The first is always a good idea. It is the primary reason all our electronics live behind a UPS:

In addition, I posted my personal experience (Samsung microSD cards last way longer than SanDisk cards) on Twitter:

[Wayback/Archive] @hackaday I’m have been running a few Raspberry Pi systems with 8-32Gb micro-SD cards as web-dashboard with refreshes every few minutes or so: much write access. When using Sandisk (no matter the type) they last about a year, Samsung (no matter the type) cards last multiple years.

Via: [Wayback/Archive] hackaday on Twitter: “Raspberry Pi And The Story Of SD Card Corruption https://t.co/R8KNVmQORD” / Twitter

EMP

We had a lightning strike in the evening on 20181111 some 50 meters from our home.

It killed immediately killed this (some pictures further below):

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Posted in *nix, Debian, Development, Hardware Development, Linux, Power User, Raspberry Pi, Raspbian | Leave a Comment »

For my link archive: ISO links to openSUSE Leap 15.5 – Get openSUSE

Posted by jpluimers on 2023/06/15

For my link archive some ISO links via [Wayback/Archive] openSUSE Leap 15.5 – Get openSUSE as I am steadily working my way back into IT and Software Development so I was anxious to see what has changed on this front. In the past I usually ran OpenSuSE Tumbleweed, but now I am going for OpenSuSE Leap versions that are stable for a longer period of time as per [Wayback/Archive] Lifetime – openSUSE Wiki

Leap Major Release (15.x) extends maintenance and support until a successor. At present, a successor has not been declared; Leap 15’s lifecycle fully aligns with SUSE Linux Enterprise. There is a projection as of March 2021 that Leap 15 will extend to Leap 15.5. The previous major version of Leap, 42, was supported for more than 36 months, while the current major version of Leap, 15, would then have up to 72 months of support (12×6).

Full DVD download for off-line installation:

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Posted in *nix, LEAP, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

veltman/clmystery: A command-line murder mystery; an interactive tutorial for learning the *n*x command-line

Posted by jpluimers on 2023/01/18

Since I’m on a series of interactive tutorial sites, yesterday’s The SQL Murder Mystery made me bump into a project by [Archive] Noah Veltman (@veltman) / Twitter: [Wayback/Archive] veltman/clmystery: A command-line murder mystery

There’s been a murder in Terminal City, and TCPD needs your help.

To figure out whodunit, you need access to a command line.

Once you’re ready, clone this repo, or download it as a zip file.

Open a Terminal, go to the location of the files, and start by reading the file ‘instructions’.

I did a quick [Archive] clmystery – Twitter Search / Twitter and found the first ever Twitter mention to be this one from 2013 (boy, have I been living under a stone <g>): [Archive] RoR Group on Twitter: “A command-line murder mystery (clmystery) …” / Twitter.

Cool things:

–jeroen

Posted in *nix, *nix-tools, Apple, Development, Interactive Tutorials, Learning/Teaching, LifeHacker, Linux, Mac OS X / OS X / MacOS, Power User, Software Development, Terminal | 2 Comments »

Chris Bensen on Raspberry Pi and clusters

Posted by jpluimers on 2022/12/29

Oracle’s Pi Supercomputer

Oracle’s Pi Supercomputer ; click on the image for a larger version.

In 2019 ans 2020, [Archive] Chris Bensen and his [Archive] Oracle Groundbreakers team built a really large Raspberry Pi cluster of more than 1k pies, all network booting to become a cluster. It was for instance covered in the [Wayback/Archive] Building the World’s Largest Raspberry Pi Cluster – DZone IoT.

On his [Wayback/Archive] personal blog, he wrote a few posts like [Wayback/Archive] Chris Bensen: Raspberry Pi Overlay Root Filesystem and [Wayback/Archive] Chris Bensen: Get MAC Address for a Pi Cluster.

It made me also bump into [Wayback/Archive] Building the world’s largest Raspberry Pi cluster early 2020,

Since that wast right after the start of my rectum cancer treatment which lasted longer and, because of I got metastases a few months after radiation treatment, required more treatments than anticipated, I put a note in my bog drafts and kind of lost track.

So I was glad that in fall 2021, I bumped into the draft and found an almost year old post [Wayback/Archive] Chris Bensen: All Raspberry Pi Super Computer Posts in One Spot which is an index in all the blog posts and videos that Chris and his team produced on this project.

I then also learned the cluster had been shown on [Wayback/Archive] Oracle OpenWorld 2019, Breakthrough Starts Here and was covered in the [Archive] Top 10 Raspberry Pi Projects of 2019 | Tom’s Hardware (where I got the [Wayback/Archive] Oracle World 2019 having the 1k+ node Raspberry Pi cluster on display picture shown on the right from).

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Posted in *nix, Development, Hardware Development, Linux, OracleLinux, Power User, Raspberry Pi | Leave a Comment »