Virtualzone Blog

Export trainings from Endomondo as GPX files

I’ve been using Endomondo for years to track my trainings. However, I’ve been experiencing a lot of issues with Endomondo over the last months: Sometimes it’s not possible to log in. Other times, my trainings won’t get synced. So it’s time a new app. I’ve decided to give Strava a try. With a few lines of code, I’ve managed to export all my training data as GPX files. These can be imported to Strava, so my training history won’t get lost....

Native USB boot for Raspberry Pi 4

Here’s something that’s probably been eagerly-awaited not only by me: Finally, Raspberry Pi 4 can boot directly from USB devices. Without any of the widespread workarounds which require an SD card a primrary boot medium. This is made possible by a new firmware, the so-called EEPROM. Furthermore, a new 64 bit beta version of Raspberry OS is available, too (formerly known as Raspbian). To get started, boot your Raspberry Pi with a Raspbian or Raspberry OS installation....

Build Multi-Arch images on Docker Hub (Part 2)

Im ersten Teil dieses Artikels habe ich Euch gezeigt, wie Ihr ein Multi-Arch-Docker-Projekt anlegt, das auf einer AMD64-Plattform auch für andere Zielarchitekturen wie bspw. ARM bauen kann. In diesem Teil zeige ich Euch, wie Ihr das Ganze im offiziellen Docker Hub zum Laufen bekommt. Zunächst solltet Ihr ein Projekt im Docker Hub anlegen und dieses mit Eurem Quellcode-Repository verknüpfen. In meinem Fall nutze ich GitHub als Sourcecode-Repository und nutze die Build-Infrastruktur von Docker Hub....

Build Multi-Arch images on Docker Hub (Part 1)

Multi-Arch Docker Images sind eine tolle Sache: Benutzer Eurer Images ziehen automatisch die für Ihre Architektur passende Version Eures Image – ob AMD64, ARM64 oder ARM32. Normalerweise muss man Docker Images auf der Architektur bauen, auf der sie später auch verwendet werden. Durch die Verwendung des Emulators QEMU ist es jedoch möglich, auf einer AMD64-Architektur für alle anderen Zielplattformen mitzubauen. Kombiniert mit der Auto-Build-Funktion des Docker Hub ist das eine prima Arbeitserleichterung....

How to let Jenkins build Docker images

If you’re using Jenkins as your Continuous Integration (CI) tool and Docker to build self-contained images of your application, you may ask yourself how to automatically build Docker images during Jenkins’ build job. Here’s how I did it – with Jenkins running in a Docker container itself. So far, I’ve used the official Jenkins Docker image (the one based on Alpine). I’ve tried some of the Docker plugins for Jenkins available out there....

Using Let’s Encrypt / EFF’s CertBot with NGINX in Docker

I’m using NGINX in a Docker Container as a front-end HTTP(s) Webserver, performing SSL termination and proxying incoming requests to various other Docker Containers and VMs. Now that I’ve switched my certificates to Let’s Encrypt, I wondered how to integrate EFF’s CertBot (which is recommended by Let’s Encrypt) with my setup. Here’s how I did it. First, I’ve added two new volumes to my web-front-end’s Docker Compose File: version: '2' services: webfrontend: container_name: webfrontend [....

Creating an encrypted file container on macOS

Some years ago, I’ve used TrueCrypt to create encrypted containers for storing sensitive files. However, TrueCrypt is nowadays considered insecure and I’m on macOS Sierra 10.12 now – time for another solution. Luckily, macOS has integrated means for creating encrypted containers and saving sensitive information in it. You don’t need any additional software for this. As far as I know, this solution also works for previous versions of Mac OS X, like Mac OS X 10....

UptimeRobot: A nice free website monitoring service

Over the weekend I’ve been looking around for a free service which monitors my websites. My requirement was that I want to be able to monitor both HTTP and HTTPS sites, I need support for authentication and the monitoring service should be able to check if a specific keyword exists within the watched site (instead of just assuming that a HTTP Status Code 200 is okay). Furthermore, I needed notifications in case of downtimes (Email and Pushbullet is fine for me)....

Fix Docker not using /etc/hosts on MacOS

On my MacBook with Mac OS X 10.11 (El Capitan) and Docker 1.12.0, Docker did not read manually set DNS entries from the /etc/hosts file. When I executed “docker push” for example, this resulted in “no such hosts” errors: Put http://shuttle:5000/v1/repositories/webfrontend/: dial tcp: lookup shuttle on 192.168.65.1:53: no such host On Mac OS, Docker is running in a host container itself. Thus, you’ll have to add DNS entries to the container’s /etc/hosts file....

From FHEM to OpenHAB with Homegear: Installation/Docker container

For more than 2.5 years, I’ve now been running FHEM with several HomeMatic sensors and actors. Using the HM-CFG-LAN Configuration Tool as an I/O interface between FHEM and the HomeMatic devices, this setup has been running smoothly most of the time. The configuration was a bit tricky now and then, but it worked. However, OpenHAB seems to become a really good choice. Version 2 is currently available as Beta 3. It features a modern web interface and an easy-to-use extension manager....