David Ankin alexanderankin

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

	// Lack of tail call optimization in JS
	var sum = function(x, y) {
	return y > 0 ? sum(x + 1, y - 1) :
	y < 0 ? sum(x - 1, y + 1) :
	x
	}

	sum(20, 100000) // => RangeError: Maximum call stack size exceeded

	// Using workaround

	#!/bin/bash
	#
	# This script configures WordPress file permissions based on recommendations
	# from http://codex.wordpress.org/Hardening_WordPress#File_permissions
	#
	# Author: Michael Conigliaro <mike [at] conigliaro [dot] org>
	#
	WP_OWNER=www-data # <-- wordpress owner
	WP_GROUP=www-data # <-- wordpress group
	WP_ROOT=$1 # <-- wordpress root directory

	/**
	* More info?
	* [email protected]
	* http://aspyct.org
	*
	* Hope it helps :)
	*/

	#include <stdio.h>
	#include <stdlib.h>

	int64_t ipow(int64_t base, uint8_t exp) {
	static const uint8_t highest_bit_set[] = {
	0, 1, 2, 2, 3, 3, 3, 3,
	4, 4, 4, 4, 4, 4, 4, 4,
	5, 5, 5, 5, 5, 5, 5, 5,
	5, 5, 5, 5, 5, 5, 5, 5,
	6, 6, 6, 6, 6, 6, 6, 6,
	6, 6, 6, 6, 6, 6, 6, 6,
	6, 6, 6, 6, 6, 6, 6, 6,
	6, 6, 6, 6, 6, 6, 6, 255, // anything past 63 is a guaranteed overflow with base > 1

	.bs-docs-example
	{
	position: relative;
	margin: 15px 0;
	padding: 39px 19px 14px;
	background-color: white;
	border: 1px solid #DDD;
	-webkit-border-radius: 4px;
	-moz-border-radius: 4px;
	border-radius: 4px;

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<title>Horizontal Navigation Bar w/Rollover Effect</title>
	<style type="text/css">
	<!--

	#navbar ul {
	margin: 0;
	padding: 5px;

	# Assuming an Ubuntu Docker image
	$ docker run -it <image> /bin/bash

	.mode column
	.headers ON