Stoyan Zhekov zh

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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OSX Developer System installation

This guide assumes a fresh install of Mac OSX 10.7 Lion.

Homebrew

Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

	# Cookbook Name:: mongodb
	# Recipe:: default

	case node['platform']
	when "ubuntu"
	execute "apt-get update" do
	action :nothing
	end

	execute "add gpg key" do

	#!/bin/sh
	# Just copy and paste the lines below (all at once, it won't work line by line!)
	# MAKE SURE YOU ARE HAPPY WITH WHAT IT DOES FIRST! THERE IS NO WARRANTY!

	function abort {
	echo "$1"
	exit 1
	}

	set -e

	#!/bin/sh
	# Purpose: setup new OS X machine for Ruby/Rails development
	# Pre-Requirements: GCC (https://github.com/kennethreitz/osx-gcc-installer)
	# Usage: bash < <(curl -fsSkL https://raw.github.com/gist/4169434/rails-install.sh)

	RUBY_VERSION="1.9.3-p327"

	if [[ `which gcc` == "" ]]; then
	echo "[E] Please install GCC first. Exiting."
	exit 1

	#!/bin/bash
	#
	# Purpose: install ruby + rbenv on Ubuntu Linux
	VERSION="1.9.3-p327"

	echo "[*] --> Updates packages lists." 1>&2
	sudo apt-get update -y

	echo "[*] --> Installs curl and GIT packages." 1>&2
	sudo apt-get git-core curl -y

	#define F_CPU 1000000 // CPU frequency for proper time calculation in delay function

	#include <avr/io.h>
	#include <util/delay.h>

	int main (void) {
	DDRD \|= (1 << PD6); // make PD6 an output

	for(;;) {
	PORTD ^= (1 << PD6); // toggle PD6

	# Name: Makefile
	# Author: <insert your name here>
	# Copyright: <insert your copyright message here>
	# License: <insert your license reference here>

	# DEVICE ....... The AVR device you compile for
	# CLOCK ........ Target AVR clock rate in Hertz
	# OBJECTS ...... The object files created from your source files. This list is
	# usually the same as the list of source files with suffix ".o".
	# PROGRAMMER ... Options to avrdude which define the hardware you use for

	#!/usr/bin/env ruby

	# This is a basic deploy script for Heroku apps.
	# It provides a structure you can use to expand on
	# and add your own prereqs and deploy tasks.
	#
	# It basically ensures that:
	# 1. There are no uncommited files
	# 2. You can ssh to github
	# 3. You can connect to heroku