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How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)

Let's say you want to host domains first.com and second.com.

Create folders for their files:

completely decentralized architecture ;
a content-addressed file system (through cryptographic-hash) ;
combines Kademlia + BitTorrent + Git
Can I delete my content from the network?
- Nope, as soon as it hasn been requested it's in the wild (cf. faq#9).
Once I add something to IPFS, will it remain available to others once I turn off my computer?
IPNS: The Inter-Planetary Naming System

	# config/unicorn.rb

	# Use at least one worker per core if you're on a dedicated server,
	# more will usually help for _short_ waits on databases/caches.
	worker_processes 4

	# Since Unicorn is never exposed to outside clients, it does not need to
	# run on the standard HTTP port (80), there is no reason to start Unicorn
	# as root unless it's from system init scripts.
	# If running the master process as root and the workers as an unprivileged

	# config/deploy.rb

	require 'mina/bundler'
	require 'mina/rails'
	require 'mina/git'
	require 'mina/rbenv'

	set :rbenv_path, '/usr/local/rbenv'
	set :domain, '<your_ip>'
	set :deploy_to, '<your_deploy_path>'

	# /etc/nginx/sites-available/default

	upstream symbolet {
	server unix:/tmp/unicorn.<your_unicorn_sock>.sock fail_timeout=0;
	}

	server {
	server_name symbolet.com www.symbolet.com;
	listen 80;

	/**
	* http://applemusic.tumblr.com/
	*/

	/** Ultra Light */
	@font-face {
	font-family: "San Francisco";
	font-weight: 100;
	src: url("https://applesocial.s3.amazonaws.com/assets/styles/fonts/sanfrancisco/sanfranciscodisplay-ultralight-webfont.woff2");
	}

	#!/bin/bash
	#
	# Highligh Nginx config file in Vim

	# Download syntax highlight
	mkdir -p ~/.vim/syntax/
	wget http://www.vim.org/scripts/download_script.php?src_id=19394 -O ~/.vim/syntax/nginx.vim

	# Set location of Nginx config file
	cat > ~/.vim/filetype.vim <<EOF

	/**
	* Detects if WebGL is enabled.
	* Inspired from http://www.browserleaks.com/webgl#howto-detect-webgl
	*
	* @return { number } -1 for not Supported,
	* 0 for disabled
	* 1 for enabled
	*/
	function detectWebGL()
	{

	<!DOCTYPE html>
	<html>
	<head>
	<title>AWS Cognito + Facebook Login JavaScript Example</title>
	<meta charset="UTF-8">
	</head>
	<body>
	<script src="https://sdk.amazonaws.com/js/aws-sdk-2.1.41.min.js"></script>
	<script>