Enrico Lamperti elamperti

How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

Common Ledger CLI Commands

Income vs expenses this month?

$ ledger balance income expenses --period "this month"

What did my budget look like at a certain date?

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

	#!/usr/bin/awk -f

	# This program is a copy of guff, a plot device. https://github.com/silentbicycle/guff
	# My copy here is written in awk instead of C, has no compelling benefit.
	# Public domain. @thingskatedid

	# Run as awk -v x=xyz ... or env variables for stuff?
	# Assumptions: the data is evenly spaced along the x-axis

	# TODO: moving average

	// code updates are now there:
	// https://github.com/Bleuje/processing-animations-code/blob/main/code/radialcollapse/radialcollapse.pde

	// Processing code by Etienne JACOB
	// motion blur template by beesandbombs
	// opensimplexnoise code in another tab is be necessary
	// --> code here : https://gist.github.com/Bleuje/fce86ef35b66c4a2b6a469b27163591e
	// See the license information at the end of this file.
	// View the rendered result at: https://bleuje.com/gifanimationsite/single/radialcollapse/

	// Processing code by Etienne JACOB
	// motion blur template by beesandbombs
	// opensimplexnoise code in another tab might be necessary
	// --> code here : https://gist.github.com/Bleuje/fce86ef35b66c4a2b6a469b27163591e


	int[][] result;
	float t, c;

	float ease(float p) {


	server {
	listen 80;
	server_name your.domain.com;

	location = /analytics.js {
	# you have to compile nginx with http://nginx.org/en/docs/http/ngx_http_sub_module.html (this is not default)
	# and http://nginx.org/en/docs/http/ngx_http_proxy_module.html (it's a default module)

	proxy_set_header Accept-Encoding "";

	# VERY IMPORTANT! After each kernel update or dkms rebuild the modules must be signed again with the script
	# ~/.ssl/sign-all-modules.sh

	# Place all files in ~/.ssl folder
	mkdir ~/.ssl
	cd ~/.ssl

	# Generate custom keys with openssl
	openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -subj "/CN=Owner/"