Posts :: Schallbert's Blog

Image: An SSH public key randomart image as visual fingerprint for humans to quickly see if public keys match

Hardware Security Key: add SSH

Generate keys, configuration, test

Image: Browser (Firefox) login process for passkey usage: PIN, then touch

Hardware Security Keys

What Yubikey can do and its limitations

Image: Top page crop of OWASP''s Docker Security Cheat Sheet [Source, downloaded May-26](https://cheatsheetseries.owasp.org/cheatsheets/Docker_Security_Cheat_Sheet.html) [License](https://creativecommons.org/licenses/by-sa/4.0/)

act_runner rootless: no start

Solving `/proc/self/exe: operation not permitted`

Image: A tapered engraving tool for stainless stell application

Engrave Stainless Steel A2 / AISI304

Getting Feed, Speed, and Depth per Pass right

Image: Drawing of Tool Length Sensor on stock material with distance spindle collet, visualizing Z0 measurement

Automate tool length measurement

Questions and answers regarding EdingCNC macros

Image: additional slots in HTPC case (SECC) for better cooling

Steel sheet (SECC) milling

Feeds, Speeds & Caveats

Jekyll-dockerimage: Bundler and Gemfile

Fixing CI errors

Image: iptables view for docker-user chain

fail2ban: Configuration error

Analyzing error logs to develop fixes

Image: Macro shot of Albasia plywood, layer view

Milling Albizia/Albasia

Lightweight sandwich panels on the CNC

Image: Visualizazion of how passtdas analyzes and determines workpiece edges

passtdas - a helper for your CNC

Does your part fit on the workpiece?

Image: Symbolized Docker containers next to text ''rootless act_runner DinD''

Rootless act_runner for Gitea

Docker-in-Docker für better security

Add rate limiter to Gitea

Protect Gitea instance from Denial of Service attacks

Image: block drawing of how caddy interacts with fail2ban to rate limit accesses to my blog

Rate limiter with Caddy and fail2ban

Caddy's JSON-style logs parsed by fail2ban through Docker

Image: server at max load when gitea is flooded with GET requests

Gitea crashes: Too many requests

Examining logs to track down possible attacks

Image: Snip of OpenCart's article about data safety

My own webshop - Part3

Setting up my e-commerce site in Docker

Image: logos from different e-commerce solutions

Creating an own Webshop - Part 2"

Ecommerce solutions review

Image: text saying ''E-commerce Pt1: Requirements of a technophiliac''

Creating an own Webshop - Part 1

Requirements for a tech friendly e-commerce solution

Image: My MakerTube channel ''CNC corner''

PeerTube instance migration

While scitech.video goes offline, Makertube grows

Image: How gitea recommends to remove search indexation

Gitea: stop search indexer

I got Google's crawler confused (by accident)

Image: halftone image engraved with my CNC

Halftones on Dibond

Engraving photos: learnings and pitfalls

CNC-made greyscale images

Engrave photographs as halftone images

Image: multicolored sign ''Helft Waldbraende verhueten''

Multicolor engravings

CNC creates 3D carves

Image: Repolookout reporting a possible vulnerability on my site

Repo-Lookout: Fix repository leaks

remove .git folder from webserver

Image: Logrotate creating .1 recursively

Logrotate-Recursion

fix [xyz].log.1.1.1.1.1...

Image: First prototype of Klingenbutler

Klingenbutler

Another helper on the shower rail

Image: My NVME-SSD that suddenly broke down

Broken NVME hard disk?

How to rescue data from a defective SSD

Image: Bad Gateway error message from Gitea''s act_runner at startup

Gitea act_runner: Jump-start issues

How to correctly connect Actions to Gitea

Image: A notification message sent on error

Sending error logs

Setup notification 📧 on Automation failures

Image: Diagram showing a config file rollout on Schallbert''s server

Server configuration rollout

With scripts to auto-deployable config updates

Image: Diagram thumb for putting server config under version control

Server configuration with Git

Bringing my server's config files under version control

Image: PC towers with CNC-made window

Milling steel

Steel workpiece on a Hobby CNC: Will this work?

Image: Thumbnail of endmill cutting forces

CNC Tuning #3

optimizing the path interpreter

Image: Thumbnail of a CNC machine''s portal X-Axis

CNC Tuning #2

Turning up kinematic parameters

Image: Thumbnail of CAM simulation for G-code optimizing

CNC Tuning #1

Better G-Code

Image: Thumbnail of endmill cutting forces

Vacuum clamping

Table- and workpiece matching

Maker Faire Ruhr 2024

I as an Exhibitor

Image: Seifenbutler ready for sale

Seifenbutler - Pilot run!

Finally done. Now, can I sell it?

Image: Thumbnail of correctly rendered ''website under construction'' page on schallbert.de

‘redir’ through Caddyserver

Mitigating a Redirect-recursion

Image: unattended-upgrades and Watchtower keep my server and application packages up to date.

Automatic Upgrades for everything!

How to keep server and applications up to date

Image: side-by-side image of fail2ban and borgmatic logos

Better security for my server

Running `fail2ban`, `borgmatic` in Docker

Image: Webpage, displaying Schallbert''s Blog with broken links

Jekyll build: broken relative links

How to avoid page defects on Self-Hosted Jekyll pages

Image: giteas infrastructure in a nutshell

🗸 Gitea Actions Part2 - Jekyll-Dockerimage

Gitea action runner with Jekyll-Dockerimage

Image: github actions workflow to build Jekyll page

🗙 Gitea Actions - Jekyll Workflow

Fail: Gitea action runner with original Gitub Actions workflow

Image: Flags that can be clicked on to change display language

Multi-language site - l10n

Jekyll multilingual - how to

Image: Milled small part, size comparison to a coin

Milling small parts

Tips & Tricks

Image: DIY low-cost edge finder

DIY edge finder

Touching off easily

Image: Subsystem boundary diagram

Hardware Test

Strategy and how to

Image: Dibond engrave test runs

Dibond Tests

improving quality of CNC-cut dibond

Image: Engraving Dibond, required manual rework

Working with Aluminium composites

Dibond: CNC engrave and cut

Image: Github Actions Workflow

Github Actions: Troubleshooting

Making a build pipeline for python projects

Image: Splash screen of QR-codengrave V1.1

QR-codengrave V1.1 / V1.2

Faster Engrave Algo

Image: A small electronics Breadboard with microcontroller, LEDs etc. on to make a fireplace simulation.

Breadboard Fireplace

Flickering fire simulator using embedded hardware

Image of a Sidechain compressor vacuum pump

Vacuum Pump

for CNC: Decision aid

Image of my hole grid vacuum table

CNC Vacuum Table

Decision aid, Pros & Cons

Image: A negative carve in wood

Estlcam: Negative Carves

3D signs - tutorial

AnywhereAmps Alpha's insides

AnywhereAmps Alpha

Size S mobile instrument combo

Image of a CNC job demo

CNC job setup

Job preparation and quick demo

Inrush current measurement

Measure Inrush current

of an audio amplifier

Distorted image of a circle cut with my CNC

My CNC vibrates

From investigation to problem solution

IMAGE - CAM drawing of Image-to-Path engraving

Image to Path

From Pixel to Vector graphics

Image of an endmill path that doesn't look good at all

CNC router overload

Symptoms of insufficient spindle power

Image: Spoilboard for my BasicLine0607 CNC. It features a frame so pasts can be positioned repeatedly, and it has a hole grid to allow clamping devices to be inserted.

CNC Spoilboard

For Basicline 0607

Beginner CNC issue: Speeds/Feeds

My Endmill ‘screams’

Beginner CNC issue: Speeds/Feeds

Image: snippet of the tool length sensor self-test macro for my CNC machine. It shows C-style code and checks if the probe touches the sensor.

CNC Part5 - Macros

Automatic Z-referencing, Tool length, Tool changes

Zerspanobert's switchbox, components labeled

CNC Part 4.1 - Config

EdingCNC Settings & Variables

First steps with CNC software & config

CNC Part4 - Setup

Software/Hardware setup & kinematics

Completed build of Zerspanobert - Sorotec Basicline 0607

CNC Part3 - Build

Assembling Sorotec's Basicline 0607

switchbox of my CNC machine

CNC Part2 - Electronics

Switch box setup

My portal milling machine in mid-construction

CNC Part1 - Portal milling machine

Entry-point and questions

Inrush limiter circuit variant

Inrush Current Limiter - Part2

Circuit & Application examples

ST''s EVAL-SCS001V1: STUSB4500 evaluation board

USB Power Delivery

USB-PD power supply explained

Metabo / Cordless Alliance Systems

Can I use a Metabo/CAS battery for my system?

Max1756x typicall application, image courtesy of Maxim Integrated

Configure MAX1756x for your application

How to set protective voltage & current limits

Electrical light bulb, 12V 5W

Inrush Current Limiter - Part1

Current inrush limiters explained

Typical TVS voltage diagram

Transient Voltage Suppressors

Electronics knowledge: TVS diodes

Image: MAX17562 with polarized capacitors on in- and output. This is fatal.

Power supervisor MAX1756x on capacitive load

Or how to kill your circuits

VLC media player icon

Convert videos with VLC player

How to properly talk to VideoLan's VLC player

Freecad example design in 3D view

My Printed Circuit Boards arrived!

Prototype build, issues, improvement ideas for Revision2

Image: Freecad example design in 3D view

FreeCAD modeling workflow

How To: First steps with FreeCAD

Preamp prototype board soldered and working

How to create better PCB designs

Professionalizing circuits for AnywhereAmps

Preamp prototype board soldered and working

Preamp design considerations

AnywhereAmp Alpha's simple single-supply preamp

shelly13's folding mechanism

Shelly13 - Part2

Design, folding, stability, amplifiers

shelly13 prototype in CAD

Shelly13 - Part1

Evolving the mobile, foldable instrument combo

Paginator broken, Favorite icon placed

Fix 'ERROR: favicon not found'

MobFobAmp Folded

MobFobAmp

Foldable instrument combo

markdown to pdv converter extension for VS code

Markdown to PDF

Export the instructions from Markdown to PDF! but how?

github move operation for renaming

Jekyll: images

Why some images display OK locally but won't on Github

Schallbert's Desktop

This site: Table of Contents

How to make ToC sticky

Jekyll `-incremental` option

How to solve issues with disappearing posts

MinimalMistakes theme - Page design

Configure: landing page header image, Navigation