Node-RED is a tool that allows to develop flow-based apps. Users can create apps using visual programming, making it easy for everyone to create apps. Focus is on IoT based solutions. IBM released it under an open source license already in 2016. Therefore, developing apps is not only easy, but Read more…
Installing Docker on a Raspberry Pi is as easy as following the official Docker installation guide. This document contains the steps to install Docker in a wide range of Debian based systems, including Raspbian. As the steps are in one document you have to jump to different sections. To make Read more…
Some time passed since I last wrote about OBS. In 2014, I started using OBS as a streaming solution for an event in Sao Paulo. I had quite some time to convince the co-organizers that streaming to an app and YouTube at the same time is a good idea, and Read more…
Raspbian is based on Debian. Upgrading it to the latest version is done the same way as upgrading a normal Debian distribution. To not make this my shortest blog ever, I’ll show how I upgrade one of my Raspberry Pi. The upgrade to release N is performed by starting the Read more…
After setting up a DHCP server on a Raspberry Pi running Linux I get working leases for my clients. However, these are not static. It can happen that my smartphone gets a new IP address the next it connects: 192.168.0.161 instead of 192.168.0.160. For some clients I want to make Read more…
My internet provider is Unitymedia. Their default router comes with a DHCP server. Honestly, it’s one of the worst products I ever had to work with. My private network is 192.168.0.x. The DHCP server of the Unitymedia box is distributing from time to time leases for 192.168.192.x. Changing my private Read more…
Recently I had the problem that running apt-get update stalled while trying to connect to an IPv6 address. For instance, on a Raspberry Pi, the update process stalls while trying to connect to archive.raspberrypi.org. All other connections worked fine. Looking at the console output, a difference was that apt was Read more…
OpenVPN uses certificates to authenticate the server and clients. Therefore, the client needs to have a valid client certificate. This certificate needs to be issued by the CA server that also issued the certificate of the OpenVPN server. In my case, this server is installed together with the OpenVPN server Read more…
Recently I got some new hardware that I will use to run some useful software. To use the software from anywhere, I’ll need to have remote access. As I cannot do DMZ or port forwarding with my new internet provider, I decided to connect my home server using VPN to Read more…
A 5xx error code is returned by a web server when something went wrong: The server was not able to process the request. For a reverse proxy, a common 5xx error message is 503, meaning that the backend server is not reachable. In the technical architecture of my blog site, the Read more…