Details About Upcoming Meetings

  ALERT: until further notice, meetings will be conducted via teleconference.

To attend this meeting, go to NoVaLUG's Meetup site.. RSVP by clicking on: attend button
A link to join the meeting will be revealed on Meetup.

New attendees may wish to familiarize themselves with ZOOM before the meeting by going to ZOOM video teleconferencing.

Date /
In chronological order — Previous History

Please check back.

DATE in fomat 2021.08.14

Rich Lucente

Decoding Radio Signals with an SDR on Raspberry Pi

Build a public safety radio scanner for under $100 using the Raspberry Pi 4. Discover what digital trunked radio is and how to set up hardware and software on the RPi 4 to decode Project 25 radio traffic and stream to an icecast server. The icecast server, running on a separate Linux system provides client access to the stream and archives the streams using systemd timers/services. Connect over WiFi with VLC to the Icecast server and listen live to public safety radio traffic. At this meeting, Rich will share his experiences assembling and operating this method.


John Kennedy

bolt Lightening Talks — Rasp Pi  bolt

Led by John Kennedy, speakers will talk about things they have done with their Raspberry Pi computers. He will speak on using a Pi to deploy to AWS with Terraform and Ansible.

We have had previous, relevant presentations at NoVaLUG meetings. Look for them on our Presentations page. Examples: science experiments aloft, kite photography, Pi Hole.


Roger Broseus


Best viewed on device with a large screen.


The GIMP — GNU Image Manipulation Program — is a free and open source program licensed under the GPLv3+ license. It is very powerful alternative to non-free (expensive) image editing programs. It is available for Linux, Windows and macOS. The GIMP has been under continuous maintenance and development since 1995 and is widely used by amateurs and professional photographers for post processing of their images.

Session Objectives

This talk is aimed both at introducing prospective users to The GIMP as well as moving on to intermediate levels of usage. Expect the following:

  • Intro to basics of imaging as they relate to editing photos.
  • A few basics about shooting photography.
  • Some basic setup info for The GIMP, including,
    • Setup and layout,
    • Short-cut keys.
  • Demonstrations of editing tools for basic and intermediate operations.
  • Tips and tricks.
  • Q & A.
  • How to get The GIMP
  • References / Resources

Previous Sessions

Date /
In Chronological Order
14:30 EDT

Greg Kurtzer
R. Leigh Hennig

The Rocky Linux Project

Note: This meeting, sponsored by the Wolverhampton (UK) LUG, will open at 14:40 EDT (19:30 GMT); the formal presentation will start ~  15:30&EDT (20:30 GMT).

Session Objectives

With the EOL of CentOS 8 coming this year and transition to a rolling release model, Greg Kurtzer is initiating the Rocky Linux Project, a free, community-run drop-in replacement for CentOS and RHEL. Greg is original founder of the CentOS.

After a whirlwind start of 3 months of infrastructure building, the first release candidate of Rocky Linux is expected by 31 March 2021; the official release is expected in mid-2021.

Greg and Leigh will speak and answer questions on:

  • The formation and status of Rocky Linux,
  • Address questions that sysadmins might have about migrating a CentOS system to Rocky Linux, and,
  • How users can contribute to the success of the Project.
14:15 EDT

Heather Lomond

Reverse Engineering Example
Migrate & Re-engineer Closed Source Solutions

Derived from closed source Minitouner, Longmynd is an open source an application that "talks" via USB to a DVB-S/S2 demodulator. It is mainly used by the Amateur Television Community to receive Transmissions of video pictures.

The Longmynd re-write is a transmitter solution to run alongside a Portsdown,a Raspberry Pi based Transmitter solution for DVB-S/S2 pictures. This allows for both TX and RX of video pictures on one, Raspberry Pi box. Hence, the Longmynd Receiver was born. The biggest challenge was that the specification and documentation of the DVB-S/S2 hardware (the Serrit NIM) was only available on an NDA basis and the USB interface between the hardware and the Windows PC (an FTDI board) contained custom code.

The presentation will tell the tale of some reverse engineering, trial and error, lucky guesses and hours of analysis of many GBytes of data which finally led to the fully functional, Longmynd Receiver on the RPI. The implementation has been used as the software basis for three new receivers, is fully Open Source (available on GitHUB), has been widely adopted in the ATV community. Longmynd is a two, significant, awards for innovation in the Amateur radio world.




Getting started with Traefik
Container Edge Router / Reverse Proxy

Containers enable quick installation of new applications and scaling of existing apps. Then comes exposing them to users, load balancing across replicas — even at home. Reverse proxies are a great at exposing services, terminating SSL, and modify traffic during a request. Traefik is a popular reverse proxy for exposing containers because of its flexibility, as a load balancers, and its but ability to with Docker, Kubernetes, Let's Encrypt, and more.

We will demonstrate the whys and hows of running Traefik at home and in an enterprise. To follow along with demos:

  • Pre-install Docker, including docker-compose.
  • Expose port 443 to the internet too to use Let's Encrypt.

Traefik works on ARM so it works well on a Raspberry Pi. Knowledge of containers will help, but isn't necessary — we'll review the important stuff as we go.

Michael and Phil are Docker Captains from Virginia Tech.

14:15 EDT

Peter Larsen

CentOS Is Not Dead

— The rumors of CentOS' death are wildly exaggerated —

On December 8, 2020, Red Hat announced a big change for the CentOS project. Peter Larsen from Red Hat will talk about the changes and how it brings CentOS ("Stream") than CentOS Linux is today. He will discuss how Fedora, CentOS and RHEL get software, updates and how the process works. The process of converting CentOS Linux to CentOS Stream will also be described.