WirelessMoves – Page 43 – My Thoughts on the Evolution of Wireless, FOSS and the Past, Present and Future of Computing

Mars Landing Party Tonight – Wanna join?

Postion of NASA’s Mars spacecratft on Thursday morning (CET)

Today, Thursday, 18th February 2021, another spacecraft with a rover arrives at Mars and will attempt a spectacular landing with parachutes, retro-rockets, and a sky-crane. The press folks at NASA like to call it the 7 minutes of terror. As a space-geek I am very much looking forward to the event. Have a look here for the current position and flight data of the spacecraft as it approaches Mars. This real-time simulation of objects in the solar system allows you to look around in all directions from the spacecraft to see what you would see if you were actually there.

I will certainly watch the live commentary of the descent and landing on NASA’s TV channel and will run the 3D Mars landing simulation in real-time while it happens. Well, actually with a delay 11 minutes. And then I thought: Wouldn’t it be nice to talk and chat about this with other space buffs reading this blog before, during, and after the event? Yes, I know, there’s Twitter and other places to go to, but it’s too slow, the crowd is too big for voices to be heard, and too impersonal. So I decided to open up a Jitsi session OVER HERE for anyone who wants to join and chat about the landing. I will be there from around 8 pm CET (Central European Time) this evening! Wanna join?

I’m Giving An Online Docker Hands-On Workshop

Like most conferences in the first half of 2021, the Chemnitzer Linux Tage (Chemnitz Linux Days) on the 13th and 14th of March will be held online. Apart from very interesting talks about Linux-related topics, most of them in German, the conference also offers a broad range of workshops. While I like to give talks, I have to admit that after a year of doing them online, I am a little tired of staring into the lens of a camera while seeing nobody and only receiving little feedback. So in return for the inspiration I always get from such events by listening to talks of others, I decided to offer something different in return this time.

App to Docker – Part 3 – Software Updates

In part 1 and 2 of this series I reported about my progress towards containerizing my own server-side code. Now that things are in place, the next question is how to perform software updates. The answer is surprisingly simple.

App to Docker – Part 2 – Environment Variables

In the previous part, I’ve started working on getting the server-side code of my web-based database application into containers for easy deployment, maintainability, and update. The particular focus in that episode was how to automatically pre-populate volumes for persistent data with things such as default configuration files. In this part, I’ll have a look at how to use environment variables to configure parameters required for my container to communicate with an accompanying MySQL database container.

WirelessMoves In A Container

I’m interrupting the regular programming today for a minute for a special infrastructure announcement! You might have guessed that I had a couple of things in mind when I started my Dockerize-Me learning journey some time ago and one of them was to put this blog, now in its 16th year, into a container.

App To Docker – Part 1 – Volume Magic

After the six ‘Dockerize Me‘ and four ‘Kubernetes Intro‘ episodes that mainly dealt with getting a good understanding of how to use containers, the time has come for me to deal with the ‘end boss‘ of the game: Dockerizing the web-based database system I’ve been working on in my quality time over the years.

I have played with the thought of open-sourcing the code for some time, but installing Apache, MySQL, SSL certificates, etc., etc., and configuring the system is beyond most people who would be interested in using it. But putting the system in containers for easy deployment, operation and upgrades would change the game. So in this and the following episodes, I give an overview of the steps I have taken to containerize my system. I think the time two write this down is well invested, as the steps I have taken are a good blueprint, and will perhaps also be useful for your future projects.

Dockerize-Me: Traefik as Reverse-Proxy – Part 6

In part 3 of my Dockerize-Me series I’ve been looking at how to run several web services on the same server, make them accessible on the same ports (80 for http and 443 for https) and add Letsencrypt TLS certificates for secure communication. This is typically done with a reverse http proxy setup as described in episode 3 (in Docker containers of course…). In the feedback, several people suggested that I should also look at Traefik as another alternative. So as I like choice, I did just that.

CPRI, eCPRI, ORAN and the Fronthaul

When people ask me for the ‘elevator pitch’ on ORAN my quick summary is that Open-RAN aims to:

1) separate hardware from software;

2) put all software that does not require dedicated hardware on virtualized (x86) servers or into containers ‘in the cloud’ and use high speed fiber links to connect to the remaining hardware (and software) at the distributed cell sites;

3) provide standardized interfaces between components in the RAN so software and hardware can come from different vendors.

4) increase competition to foster innovation and reduce prices.

There are lots of interfaces standardized in ORAN and each has its individual story of how and why. One interface of particular interest to me is the fiber connection between the digital baseband unit at a cell site, usually at the lower end of a tower, and the radio unit which is usually located at the top of a tower close to the antennas. This part of the RAN is also referred to as the ‘fronthaul‘ and the CPRI protocol is used to exchange data over the link. So how does that work today and how does ORAN want to change this interface to become more flexible and open?

Running Ubuntu 20.04 With a GUI In The Cloud

In most cases when we are talking about ‘the cloud’ today, we are talking about virtual machines running on servers in a data center. The real servers below those VMs don’t have a screen attached nor do they have graphics hardware and the virtual machines running on them are usually only accessed for maintenance and configuration via ssh. That’s probably because running a virtual machine with a GUI and a desktop in the cloud that is then accessed over VNC or RDP is not done very often but comes in handy for quite a number of applications. When I recently experimented with this I noticed that there aren’t many descriptions around how to set up such a system. And those that exist did not lead to immediate success, as the way a Linux desktop is started seems to change constantly and depends on which desktop is used. Instructions how to launch a VM with a current version of the Xfce desktop did actually work but I wanted to have an Ubuntu 20.04 Gnome based desktop GUI on a VM in the cloud. After a couple of hours I managed to get a working setup and here is how it is done:

Quick Support Tool: Nautilus ‘Send Path and Filename’ Extension

It happens quite often in my household that I am asked to have a look at an Office document to help with formatting and other things. More often than not the solution to the problem does not come easy and I prefer to work on the solution at my own desk. That means that the file has to be copied, which can be done in many different ways, but that’s usually time-consuming. Since I usually have file system access to the device, I have wished for a long time that I could just send myself a message that contains the path and name for the file in question. So when I had a bit of time recently, I put together an add-on for the Linux Nautilus and Nemo file managers to do just that.