Raspberry Pi OS

Store files on the SD even when the overlay file system is active
Make it able to run containers
1. Kernel containerization features
2. Firewall settings
Sources

Store files on the SD even when the overlay file system is active

The files just need to be stored on a different file system from /. You can partition the SD and use that, or create a file and mount it as a virtual file system:

truncate -s '6G' 'file'
mkfs.ext4 'file'
mkdir 'mount/point'
sudo mount -t 'ext4' -o 'loop' 'file' 'mount/point'
sudo chown 'user':'group' 'mount/point'
touch 'mount/point/new-file'

Make it able to run containers

Kernel containerization features

Enable containerization features in the kernel to be able to run containers as intended.

Add the following properties at the end of the line in /boot/cmdline.txt:

cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory

Firewall settings

Switch Debian firewall to legacy config:

update-alternatives --set iptables  /usr/sbin/iptables-legacy
update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy

Sources

The k3s project page
The Build your very own self-hosting platform with Raspberry Pi and Kubernetes series of articles
Run Kubernetes on a Raspberry Pi with k3s
Project's issue 2067

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