Aaron Cruz mraaroncruz

Life and death of Unicorns

The introduction of our Unicorn management tool, Polycorn.

At Fotopedia, we use Unicorn to serve our main Rails application. Every day, we restart our application several times, spawning and killing hundred of Unicorns. Managing graceful restarts is a complex task, and requires careful monitoring and command. This article introduces our tool Polycorn, a Unicorn management program.

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Install the following requirements:

brew info zeromq
npm install zmq
npm install socket.io
gem install ffi-rzmq

Within the app directory run the following commands in different panes.

ruby worker.rb

Constant lookup in Ruby can happen lexically or through the ancestry tree of the receiver(a class or module). You can identify which lookup rules are being applied by the context you're in or by the syntax being used to define a class or module.

A class body that is defined as class A::B::C; …; end will lookup constants through the ancestry tree when a constant is evaluated in its class body. Anytime you see A::B::C being used as syntax to define a class or lookup the value of a constant the ancestry tree is being used for the lookup.

	# Generated on 2014-01-15 using generator-angular 0.7.1
	"use strict"

	# # Globbing
	# for performance reasons we're only matching one level down:
	# 'test/spec/{,/}.js'
	# use this if you want to recursively match all subfolders:
	# 'test/spec/*/.js'
	module.exports = (grunt) ->

	context_processors.py

	def baseurl(request):
	"""
	Return a BASE_URL template context for the current request.
	"""
	if request.is_secure():
	scheme = 'https://'
	else:
	scheme = 'http://'

	<?php
	//set up pods::find parameters to limit to 5 items
	$param = array(
	'limit' => 5,
	);
	//create pods object
	$pods = pods('pod_name', $params );

	//check that total values (given limit) returned is greater than zero
	if ( $pods->total() > 0 ) {

	Steps to get Raspberry Pi running with Mopidy and Spotify

	1. Raspian Wheezy Installation
	2. Install Python tools following these instructions
	(had to run most of it as sudo):
	http://raspberry.io/wiki/how-to-get-python-on-your-raspberrypi/
	3. Install Spotify libspotify
	https://developer.spotify.com/technologies/libspotify/#download
	4. Install Mopidy following these directions:
	http://docs.mopidy.com/en/latest/installation/raspberrypi/

	#!/usr/bin/ruby
	# Create display override file to force Mac OS X to use RGB mode for Display
	# see http://embdev.net/topic/284710

	require 'base64'

	data=`ioreg -l -d0 -w 0 -r -c AppleDisplay`

	edids=data.scan(/IODisplayEDID.*?<([a-z0-9]+)>/i).flatten
	vendorids=data.scan(/DisplayVendorID.*?([0-9]+)/i).flatten

	#!/bin/bash

	set -exo pipefail

	BUILD_ENV=$1
	if [ `uname` == 'Darwin' ]; then
	OSX=1
	JSCOMPRESSOR="yuicompressor --type js"
	else
	OSX=

	#!/usr/bin/env bash

	#
	# This is sp, the command-line Spotify controller. It talks to a running
	# instance of the Spotify Linux client over dbus, providing an interface not
	# unlike mpc.
	#
	# Put differently, it allows you to control Spotify without leaving the comfort
	# of your command line, and without a custom client or Premium subscription.
	#