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K3s and Traefik with Let's encrypt and basic authentication

The steps below requires that you have followed the installation steps for installing K3s on RPIs.

Prerequisites

Ensure that you have a DNS hostname that can be resolved on Inet:

$ dig +short oh.domain.se

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Installation steps for K3s traefik dashboard

The steps below requires that you have followed the installation steps for installing K3s on RPIs.

NOTE: The following file can be found in the following repository.

Installation steps for K3s traefik dashboard. On master node, create a folder called k3s-traefik:

Open Helm file:

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Configure Mosquitto bridging with TLS

The use-case for me is to connect my openHAB installation at our summer house with my production openHAB installation. The summer house openHAB instance will then just act as a slave to the production system and is connected using the MQTT binding and the MQTT Event Bus (Now replaced by the openHAB remote binding).

To be able to connect a remote Mosquitto instance to a central Mosquitto instance you need to configure the remote Mosquitto as a bridge and the central Mosquitto will then be the broker.

Broker side

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Configure JMX agent on openHAB to be able to run misison control

1. Add the following lines to /etc/default/openhab2: (NOTE: Xmx/Xms is also set to 1024m in this example)

#########################
## JAVA OPTIONS
## Additional options for the JAVA_OPTS environment variable.
## These will be appended to the execution of the openHAB Java runtime in front of all other options.
## 

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Boot Raspberry Pi 4 from USB device

1. Use Raspberry PI Imager to flash latest Raspberry Pi OS Lite (32-bit) on a SD card
2. Add ssh support and WiFi (if not using wired), follow this gist for instructions
3. Plug the SD card in your Pi 4 and power it up and ssh to it
4. Update your OS and firmware by issuing:

sudo apt update
sudo apt full-upgrade

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Adding WiFi and SSH access to Raspberry via SD card

1. Insert the SD card into a USB card reader, and plug it into your Mac
2. Navigate to /boot partition using you OS file explorer (On MAC /Volumes/boot)
3. Create a file on /boot named wpa_supplicant.conf
4. Add the following content to the file:

country=SE # Your 2-digit country code
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev

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Build and install drivers for Tellstick Duo on Raspberry PI

sudo sh -c 'echo "deb-src http://download.telldus.com/debian/ stable main" > /etc/apt/sources.list.d/telldus.list'
wget http://download.telldus.com/debian/telldus-public.key
sudo apt-key add telldus-public.key
sudo apt-get update
sudo apt-get install build-essential
sudo apt-get build-dep telldus-core
sudo apt-get install cmake libconfuse-dev libftdi-dev help2man

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Backing up Raspberry Pi SD Cards on Mac OS X

1. Insert the SD card into a USB card reader, and plug it into your Mac

2. Open Terminal.app and use the following command to list the disks attached to your Mac and identify which /dev/disk corresponds to the SD card (look for the disk that includes a partition of type Linux):

diskutil list

diskutil unmountDisk /dev/disk3

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Man in the middle proxy on MAC.

To be able to reverse engineer Web APIs it is very convenient to use a man-in-the-middle proxy that can in detail reveal what is being sent over the line.

For MAC I recommend to use the mitmproxy which is very easy to install and use. To install just use brew:

brew install mitmproxy

mitmproxy is opensource and can be found on github.

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InfluxDb and Grafana in K3s

The installation steps requires that you have configured NFS client as described in: https://gist.github.com/jannegpriv/f78b59d93c7a815b1fbcb940277bb762

The steps below are based on information in this article.

InfluxDb

Check for the latest official docker image for InfluxDb on DockerHub.