https://blog.tomlankhorst.nl/ Tom Lankhorst2021-04-05T00:00:00Z https://blog.tomlankhorst.nl/share-bluetooth-adapter-between-vm/2021-04-05T00:00:00Z

I virtualize Windows on Linux via QEMU-KVM and VFIO. A Bluetooth adapter populates one of the USB ports of the Host. When I start a Windows VM, I have libvirt t

https://blog.tomlankhorst.nl/copy-container-image-ssh/2021-02-18T00:00:00Z

Copy an image from one host to another, without using a Docker registry:

https://blog.tomlankhorst.nl/setup-lvm-raid-array-mdadm-linux/2021-02-09T00:00:00Z

License: CC BY 4.0

https://blog.tomlankhorst.nl/unresponsive-usb-unbind-bind-linux/2020-10-31T00:00:00Z

After updating my Ubuntu 20.04 LTS installation’s Linux Kernel to 5.8 from 5.4, I started experiencing irregular problems with unresponsive USB devices after re

https://blog.tomlankhorst.nl/testing-code-in-markdown-doc-md-github/2020-07-16T00:00:00Z

I enjoy a quick-start when I try out some new software. The sooner I see something blinking, the better. Straight-forward documentation and clear examples impro

https://blog.tomlankhorst.nl/apache-cross-origin-resource-sharing-cors/2020-04-18T00:00:00Z

The Cross-Origin Resource Sharing or CORS policies of a webhost indicate whether a browser should allow a script to access their resources.

https://blog.tomlankhorst.nl/jenkins-trigger-build-organization/2020-04-14T00:00:00Z

Learn how to trigger all builds in a Jenkins organization or folder through the Groovy script console.

https://blog.tomlankhorst.nl/distcc-docker-service/2019-12-28T00:00:00Z

Distcc allows you to distribute the compilation of C, C++ and Obj-C. It wraps your typical compiler executable and offloads the compilation to remote and local

https://blog.tomlankhorst.nl/get-phpdoc-parameters-of-a-method/2019-04-28T00:00:00Z

A well-written PhpDoc is a goldmine of information. It may feel redundant, however, to document values that you use in your code too. Why not parse the PhpDoc i

https://blog.tomlankhorst.nl/chunk-an-iterator-into-arrays/2019-04-26T00:00:00Z

PHP’s iterators can take the heat out of memory consumption when processing big datasets. Typical for such datasets is that workers process them in manageable c

https://blog.tomlankhorst.nl/secure-nginx-docker-container-with-lets-encrypt/2018-12-04T00:00:00Z

For web-applications, securing the communication between client and application is essential. As containerisation of such applications becomes the standard, I w

https://blog.tomlankhorst.nl/compact-switch-alternative-php/2018-10-07T00:00:00Z

Some situations in PHP require a set of variables to have values depending on some condition. To achieve such variable-assignment, a switch statement is the tra

https://blog.tomlankhorst.nl/filtering-and-control-library/2018-08-29T00:00:00Z

**Check out this header-only C++11 library of control and filter tools. Currently it features PID control, bi-quads (or second-order-sections), state-space syst

https://blog.tomlankhorst.nl/iterm-tmux-vim-true-color/2018-08-07T00:00:00Z

The terminal can be an effective workhorse for achieving a job. It is fast and agile and allows you to do get things done that would have taken you much more ti

https://blog.tomlankhorst.nl/quick-fix-matlab-fmu-import-error/2018-03-20T00:00:00Z

**MATLAB 2017b introduced support for the Functional Mock-up Standard by providing FMU-import blocks in Simulink. This open standard enables mixing of simulatio

https://blog.tomlankhorst.nl/vagrant-lxc-nfs-timeout/2017-07-22T00:00:00Z

Vagrant-LXC is a plugin that provides integration of Vagrant with LXC containers, a modern virtualisation technology native to Linux. To share files between the

https://blog.tomlankhorst.nl/not-valid-template-file-magento-1-9-3-4-symlinks/2017-07-20T00:00:00Z

**Keeping Magento shops up to date is important to reduce their vulnerability. Sometimes, security updates introduce breaking changes. The recent Magento update

https://blog.tomlankhorst.nl/mysql-my-cnf-options-file/2017-02-24T00:00:00Z

**Connecting to a MySQL server often involves providing hostnames, usernames and passwords. Use a .my.cnf configuration file to provide defaults that simplify w

https://blog.tomlankhorst.nl/ssh-key-based-authentication/2017-02-24T00:00:00Z

**If you use Git or remote terminal session a lot, consider using key-based authentication. Key-based authentication is generally considered more secure than pa

https://blog.tomlankhorst.nl/import-remote-mysql-db-over-ssh/2017-02-24T00:00:00Z

Developing, maintaining and debugging web-applications often involves copying a remote database to a local or another remote machine. This post lists a number o

https://blog.tomlankhorst.nl/avr-develop-debug-on-mac-os-x-with-clion/2017-01-21T00:00:00Z

Previously I used Atmel Studio 7 to do AVR development. This integrated development environment is unsurpassed in terms of ease of use and features for AVR deve

https://blog.tomlankhorst.nl/pick-random-values-array-php/2017-01-07T00:00:00Z

PHP provides the array_rand( $arr, $num ) function which returns an integer or array containing the keys of the array.

https://blog.tomlankhorst.nl/laravel-5-cron-expression-validation/2016-12-31T00:00:00Z

A Cron expression validator is created in Laravel 5.3. Laravel provides a versatile and extendable Validation class. Introducing new validations is done by regi

https://blog.tomlankhorst.nl/brew-bundle-restore-backup/2016-12-23T00:00:00Z

**Homebrew is a popular package manager for MacOS. It provides easy access to thousands of programs and applications. It is developed and maintained by an open-

https://blog.tomlankhorst.nl/fix-magento-undefined-index-session_expire_timestamp/2016-10-15T00:00:00Z

**Some days ago the Magento security update SUPEE-8788 was released. This update fixes a number of critical vulnerabilities. To fix an existing shop one could e

https://blog.tomlankhorst.nl/filter-controller-cpp-implementation/2016-09-13T00:00:00Z

Controllers and filters are often a good way to stabilise a system, condition a signal or make a system follow a reference. The usual approach is to model the s

https://blog.tomlankhorst.nl/update-nexus-6p-android-7/2016-09-01T00:00:00Z

Android 7.0 is out! I’m really wondering about the split view mode and the new notification. I wanted to upgrade my Nexus 6P as soon as possible. The update was

https://blog.tomlankhorst.nl/jira-behind-reverse-proxy-ispconfig/2016-08-06T00:00:00Z

If you use both JIRA and ISPConfig on a server you might want to set-up a reverse proxy to serve the JIRA frontend securely on the standard HTTPS port just like

https://blog.tomlankhorst.nl/rmdf-in-matlab-or-octave/2016-08-06T00:00:00Z

The Random Midpoint Displacement Fractal (RMDF) is a fractal this is often used for generating height-maps, landscapes, rough surfaces and more. Its implementat

https://blog.tomlankhorst.nl/free-ssl-certificates-use-lets-encrypt-with-ispconfig/2016-04-17T00:00:00Z

As you might have noticed this site uses HTTPS. Obtaining SSL certificates was always a bit of a hassle. Finding a certificate authority, doing regular payment,

https://blog.tomlankhorst.nl/matlab-to-latex-with-matlab2tikz/2016-04-14T00:00:00Z

Papers and reports can’t do without both but integrating MATLAB figures in LaTeX is not so obvious. Different methods for exporting and including graphics exist

https://blog.tomlankhorst.nl/estimating-decawave-dw1000-tx-time/2016-04-13T00:00:00Z

I like to share with you my C implementation for estimating the DecaWave transmission time because it has been created with help from the community and thus sho

https://blog.tomlankhorst.nl/no-post-response-due-to-csrf-in-magento/2015-11-10T00:00:00Z

Magento now includes CSRF (Cross-Site Request Forgery) protection on publicly available forms such as the new user registration form. The goal of this is to mak

https://blog.tomlankhorst.nl/fix-magento-1-9-2-2-notice-undefined-variable-block/2015-10-29T00:00:00Z

This problem arose after upgrading to Magento 1.9.2.2. which is a patch release that patches a number of security flaws in Magento. After installation of the pa

https://blog.tomlankhorst.nl/creating-module-to-overwrite-magento-core/2015-08-07T00:00:00Z

The layout of Magento’s information, warning and error messages cannot be easily changed using layout and template files. The HTML generation is done from a Blo

https://blog.tomlankhorst.nl/mysqli-database-driver-for-kohana-3-3/2015-02-23T00:00:00Z

A couple of months ago I published my Kohana MySQLi database driver on GitHub. As the development of the framework came to a halt for the last few months the PH

https://blog.tomlankhorst.nl/radius-authentication-driver-for-kohana-3-3/2015-02-23T00:00:00Z

Lately I was in need for an authentication driver that supports RADIUS servers. Happily the Kohana Auth module supports easy development of custom authenticatio