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Encrypted Btrfs storage setup and maintenance guide

Initial setup with LUKS/dm-crypt

This exemplary initial setup uses two devices /dev/sdb and /dev/sdc but can be applied to any amount of devices by following the steps with additional devices.

Create keyfile:

dd bs=64 count=1 if=/dev/urandom of=/etc/cryptkey iflag=fullblock
chmod 600 /etc/cryptkey

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Ubuntu Noble Numbat

This is a placeholder for the 15th August 2024 release of Ubuntu 24.04.1

To start, read the official release notes.

If your install fits into "vanilla Ubuntu plus maybe a handful of 3rd-party repos", then this guide for a simple upgrade to Ubuntu 24.04 "Noble Numbat" from Ubuntu 22.04 "Jammy Jellyfish" can be helpful. 3rd-party repos are handled with a find command.

Some stats: - Total number of links: 23983

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	# Source: https://gist.github.com/681a5f4455428379e00bc815450e12d8

	#############################################
	# eksctl #
	# How to Create and Manage AWS EKS clusters #
	# https://youtu.be/pNECqaxyewQ #
	#############################################

	#########
	# Setup #

	# To prevent unsuppoorted architecture error messages from apt on Ubuntu 24.04 (Noble Numbat)
	# with the new apt sources format

	# Example error messages on `apt update` after a fresh install:
	# N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://packages.microsoft.com/repos/edge stable InRelease' doesn't support architecture 'i386'
	# N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://dl.google.com/linux/chrome/deb stable InRelease' doesn't support architecture 'i386'

	#################################################
	### SINGLE-ARCH (i.e. fix arch-related error) ###
	#################################################

	// from: http://dis.4chan.org/read/prog/1295544154/170
	function sleepSort(list, callback) {
	const result = [];

	list.forEach((i) => setTimeout(() => {
	result.push(i);

	if (result.length == list.length) {
	callback(result);
	}

	import re
	from itertools import chain


	def calculate_readability(code_string:str) -> float:
	code = code_string.splitlines()

	# Heuristic 1: Line length
	max_line_length = 80
	long_lines = sum(1 for line in code if len(line) > max_line_length)

	import asyncio
	import random


	class Hub():

	def __init__(self):
	self.subscriptions = set()

	def publish(self, message):