• Raspberry Pi 4 and case
• Nooelec NESDR SMArt Bundle RTL-SDR
• 32 GB microSD
• keyboard and mouse
• HDMI cable and display
• USB memory card reader

1. Install the Raspberry Pi Imager and create Raspbian microSD
2. Install the microSD and setup OS
3. Continue configuring the OS through the Raspberry Pi Software Configuration Tool
4. Run sudo raspi-config to open the config tool

1. Configure the keyboard first. A bad keyboard layout can mess up other steps.
   • Select Localisation Options
   • Select Change Keyboard Layout
   • Select Generic 105-key PC
   • If the keyboard list is showing non US layouts
     • Select Other
     • Select English (US)
     • The layout list will reload with english layouts.
   • Select English (US)
   • Select The default for the keyboard layout
   • Select No compose key
2. Select Change User Password to change the default password
3. Select Network Options to change the hostname
   • Select Hostname and follow the instructions
4. Select Network Options to connect to wifi
   • Select Wi-fi and follow the instructions
5. Select Interfacing Options to configure SSH
   • Select SSH and follow the instructions
6. Exit the config tool
7. Run ifconfig to make sure that wlan0 has received an IP address

1. Select Change User Password to change the default password
2. Select Network Options to change the hostname
   • Select Hostname and follow the instructions
3. Select Interfacing Options to configure SSH
   • Select SSH and follow the instructions
4. Exit the config tool
5. Run ifconfig to make sure that wlan0 has received an IP address

1. Run sudo apt install ufw to install Uncomplicated Firewall
2. Run sudo ufw allow from 192.168.100.0/24 to any port 22 substitute the IP address with the domain ranges
3. Run sudo ufw default deny incoming && sudo ufw default allow outgoing to configure default rules
4. Run sudo ufw enable to enable the firewall
5. Run sudo systemctl enable ufw to start the service on boot

1. Run sudo apt install rtl-sdr to install RTL-SDR libraries
2. Run sudo apt install sox to install SoX which will stream audio

This command will stream audio through the hdmi port sudo rtl_fm -g 50 -f 89.5M -M wbfm -s 256k | play -r 32k -es -t raw -b 16 -c 1 -| omxplayer -o hdmi -p

Install PIP for package management

sudo apt install python3-pip

Don't install through pip, instead install pipenv which can be used to generate an environment for the project much like npm.

pip3 install pipenv

pipenv install pyrtlsdr

install the python rtlsdr wrapper. this wraps the librtlsdr

pip3 install pyrtlsdr

• https://mode-s.org/decode/
• https://www.allaboutcircuits.com/projects/track-overhead-flights-raspberry-pi-zero-w-software-defined-radio/
• https://pypi.org/project/pyrtlsdr/
• https://inst.eecs.berkeley.edu/~ee123/sp16/labs.html
• https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_Python
• https://github.com/itdaniher/rtlsdr-rds-demod

Streaming links

• https://pypi.org/project/pyrtlsdr/
• https://docs.python.org/3/library/asyncio.html
• https://pyrtlsdr.readthedocs.io/en/latest/Overview.html
• https://pyrtlsdr.readthedocs.io/en/latest/rtlsdraio.html
• https://realpython.com/async-io-python/

Kubernetes

• https://microk8s.io/#get-started
• https://github.com/obsidiandynamics/kafdrop
• https://github.com/kubernetes/dashboard
• https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl-on-linux

Using k3s

• https://github.com/teamserverless/k8s-on-raspbian/blob/master/GUIDE.md
• https://medium.com/parkbee/life-on-the-edge-a-first-look-at-ranchers-lightweight-kubernetes-distro-k3s-15a3aab1f0fb

show the nodes sudo k3s kubectl get node

taint the master node sudo k3s kubectl taint nodes brian-zenbook key=value:NoSchedule

remove swap to increase k8s performance

sudo dphys-swapfile swapoff && \
sudo dphys-swapfile uninstall && \
sudo update-rc.d dphys-swapfile remove

sudo systemctl disable dphys-swapfile

add a role to the new node sudo k3s kubectl label node raspberrypi node-role.kubernetes.io/node=""

delete a label sudo k3s kubectl label node raspberrypi node-role.kubernetes.io/node-

show node labels sudo k3s kubectl get nodes --show-labels

http://192.168.1.2:30124/

use nginx-test.yml

deploy pod sudo k3s kubectl apply -f nginx-test.yml

delete pod sudo k3s kubectl delete -f nginx-test.yml

get all pods on all nodes kubectl get pod -o=custom-columns=NODE:.spec.nodeName,NAME:.metadata.name --all-namespaces

• https://www.docker.com/blog/getting-started-with-docker-for-arm-on-linux/

Add the current user to the docker group to avoid needing sudo to run the docker command: sudo usermod -aG docker $USER

relogin into user for group to take affect or su - $USER

The problem with building images is that the Pi is ARMv7 (armhf) so we need to enable the experimental buildx for docker to build multi architecture containers https://github.com/docker/buildx

export DOCKER_CLI_EXPERIMENTAL=enabled export DOCKER_BUILDKIT=1 docker build --platform=local -o . git://github.com/docker/buildx mkdir -p ~/.docker/cli-plugins mv buildx ~/.docker/cli-plugins/docker-buildx

docker --help should confirm the new buildx command

grab the latest QEMU (amd64 version) https://hub.docker.com/r/docker/binfmt/tags

docker pull docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64-amd64

this doesnt last a reboot? docker run --rm --privileged docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64-amd64

check QEMU cat /proc/sys/fs/binfmt_misc/qemu-aarch64

http://www.guoyiang.com/2016/11/04/Build-My-Own-Raspbian-Docker-Image/

losetup -f will find the next unused loop device location

sudo losetup -Pr `losetup -f` <file>

losetup --list to list all devices

This will create a tar that doesn't have a '.' directory in the beginning. sudo find /mnt/rpi/ -printf "%P\n" | sudo tar -C /mnt/rpi -czpf ~/Downloads/2020-02-13-raspbian-buster-lite.tar.gz --numeric-owner --no-recursion -T -

useful links

• https://gqrx.dk/doc/practical-tricks-and-tips
• https://payatu.com/getting-started-radio-hacking-part-2-listening-fm-using-rtl-sdr-gqrx
• https://www.nooelec.com/store/downloads/dl/file/id/72/product/0/nesdr_installation_manual_for_ubuntu.pdf

Install docker https://linuxconfig.org/how-to-install-docker-on-ubuntu-20-04-lts-focal-fossa