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How to solve the curl port 443: Network is unreachable problem:

joridos@localhost:~/Documents/github$ opam init
default    Downloading https://opam.ocaml.org/urls.txt
'opam init' failed.
# opam-version    1.1.1
# os              linux
Cannot download https://opam.ocaml.org/urls.txt, please check your connection settings.
joridos@localhost:~/Documents/github$ curl https://opam.ocaml.org/urls.txt

How to build a notification feed using Stream

Introduction

In this tutorial we are going to show how easy it is to build a notification feed using GetStream.io. First of all, let's quickly introduce you to our fictional example app. It's called bug-your-friends.com and allows you interact with your friends, ping them, follow them or poke them. Here's a quick list of example interactions:

poke another user (eg. Thierry pokes Alessandra)
follow a user (eg. Tommaso follows Iris)
ping a user (eg. Josie pings Carolina)

Whenever a user is part of one of these interactions, we want to update his notification feed, update the number of unseen and unread

SchemaSpy is a neat tool to produce visual diagrams for most relational databases.

Here's how to use it to generate schema relationship diagrams for PostgreSQL databases:

Download the jar file from here (the current version is v6.1.0)
Get the PostgreSQL JDBC driver (unless your installed version of java is really old, use the latest JDBC4 jar file)
Run the command against an existing database. For most databases, the schema (-s option) we are interested in is the public one:

Build a scalable Twitter clone with Django and GetStream.io

In this tutorial we are going to build a Twitter clone using Django and GetStream.io, a hosted API for newsfeed development.

We will show you how easy is to power your newsfeeds with GetStream.io. For brevity we leave out some basic Django-specific code and recommend you refer you to the Github project for the complete runnable source code. At the end of this tutorial we will have a Django app with a profile feed, a timeline feed, support for following users, hashtags and mentions.

I assume that you are familiar with Django. If you're new to Django the [official tutorial] (https://docs.djangoproject.com/en/2.0/intro/) explains it very well.

To remove a submodule you need to:

Delete the relevant section from the .gitmodules file.
Stage the .gitmodules changes git add .gitmodules
Delete the relevant section from .git/config.
Run git rm --cached path_to_submodule (no trailing slash).
Run rm -rf .git/modules/path_to_submodule (no trailing slash).
Commit git commit -m "Removed submodule "
Delete the now untracked submodule files rm -rf path_to_submodule

How To TCP NAT Traversal using Node.js and a STUN Server

With the scarecity of IPv4 addresses, and IPv6 still not available at large, NAT traversal is becoming a necessity. Especially with the generalisation of Carrier-grade NATs that you can find on mobile connections. Even with IPv6 you may suffer NAT66. Imagine your mobile device that gets only a single Ipv6 address, and you want to share it on your computer.

The solution might be in a decentralized protocol for address attribution such

How-to setup a simple git push deployment

These are my notes basically. At first i created this gist just as a reminder for myself. But feel free to use this for your project as a starting point. If you have questions you can find me on twitter @thomasf https://twitter.com/thomasf This is how i used it on a Debian Wheezy testing (https://www.debian.org/releases/testing/)

Discuss, ask questions, etc. here https://news.ycombinator.com/item?id=7445545

On the server (example.com)

Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278
Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/
Interactive Beginners Tutorial: http://try.github.io/
Git Cheatsheet by GitHub: https://services.github.com/on-demand/downloads/github-git-cheat-sheet/

Reminder

Press minus + shift + s and return to chop/fold long lines!

	#! /bin/bash
	#
	# Diffusion youtube avec ffmpeg

	# Configurer youtube avec une résolution 720p. La vidéo n'est pas scalée.

	VBR="2500k" # Bitrate de la vidéo en sortie
	FPS="30" # FPS de la vidéo en sortie
	QUAL="medium" # Preset de qualité FFMPEG
	YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2" # URL de base RTMP youtube

	# As described in http://en.wikipedia.org/wiki/L-system#Example_7:_Fractal_plant
	import turtle

	ruleInput = ['F', 'X']
	ruleOutput = ["FF", "F-[[X]+X]+F[+FX]-X"]
	start = "X"

	front = 5
	turn = 30
	stack = []