Alexander Shcherbinin realmyst

Zero downtime deploys with unicorn + nginx + runit + rvm + chef

Below are the actual files we use in one of our latest production applications at Agora Games to achieve zero downtime deploys with unicorn. You've probably already read the GitHub blog post on Unicorn and would like to try zero downtime deploys for your application. I hope these files and notes help. I am happy to update these files or these notes if there are comments/questions. YMMV (of course).

Other application notes:

Our application uses MongoDB, so we don't have database migrations to worry about as with MySQL or postgresql. That does not mean that we won't have to worry about issues with the database with indexes being built in MongoDB or what have you.
We use capistrano for deployment.

Salient points for each file:

	var k = "";
	var t = "a";
	var $b = "+-a^+6";
	var window = {TKK: "406395.1620790940"};
	var Zb = "+-3^+b+-f";
	var cb = "&";
	var Yb = "+";
	var jd = ".";
	var Gf = "=";
	var uM = null;

	curl -O 'https://material-design.storage.googleapis.com/publish/material_v_9/0B6Okdz75tqQsSmZ5VlNBRHBXNXM/inline whatismaterial-materialprop-physicalprop-PaperShadow_01_xhdpi_008.mp4'
	curl -O 'https://material-design.storage.googleapis.com/publish/material_v_9/0B6Okdz75tqQsaVFKVXI0RUFOWTg/inline whatismaterial-materialprop-physicalprop-PaperShadow_02_xhdpi_008.mp4'
	curl -O 'https://material-design.storage.googleapis.com/publish/material_v_9/0B6Okdz75tqQsUGtDSTgtekFORGs/whatismaterial-materialprop-physicalprop-InkDisplay_xhdpi_006.mp4'
	curl -O 'https://material-design.storage.googleapis.com/publish/material_v_9/0B6Okdz75tqQsT2ZXakpkaGp4bzQ/whatismaterial-materialprop-physicalprop-InkBehavior_xhdpi_006.mp4'
	curl -O 'https://material-design.storage.googleapis.com/publish/material_v_9/0B6Okdz75tqQsc2VZVUJ5bFNscFU/whatismaterial_properties_physical_07_xhdpi_009.mp4'
	curl -O 'https://material-design.storage.googleapis.com/publish/material_v_9/0B6Okdz75tqQsMndnRld3dl9nVU0/whatismaterial-materialprop-transformingmate

	#/etc/init/{{item.app}}.conf
	description "Unicorn"

	start on startup

	console output

	env NEW_RELIC_APP_NAME={{app_name}}
	env UNICORN_WORKERS={{unicorn_workers}}
	env app=/u/apps/{{item.app}}/current

	class StateEventInput < SimpleForm::Inputs::CollectionSelectInput
	def collection
	object.send(transitions)
	end

	def input(wrapper_options)
	label_method = :human_event
	value_method = :event
	current_state = template.content_tag(:div, template.content_tag(:span, "Current state: #{object.send(human_name)}", :class => "label label-info") )

	#See https://github.com/pluginaweek/state_machine/issues/251
	module StateMachine
	module Integrations
	module ActiveModel
	public :around_validation
	end

	module ActiveRecord
	public :around_save
	end

	require 'rubygems'
	require 'zmq'
	require 'json'

	context = ::ZMQ::Context.new

	listen_socket = context.socket(::ZMQ::SUB)
	listen_socket = listen_socket.setsockopt(::ZMQ::SUBSCRIBE, "")
	listen_socket.bind("tcp://0.0.0.0:5555")

	require 'zmq'
	context = ZMQ::Context.new
	pub = context.socket ZMQ::PUB
	pub.setsockopt ZMQ::IDENTITY, 'ping-pinger'
	pub.bind 'tcp://*:5555'

	i=0
	loop do
	pub.send "ping pinger #{i+=1}" ; sleep 1
	end

	require 'em-websocket'

	class MainServer
	attr_accessor :data, :connect

	def initialize(host, port)
	@connect = TCPSocket.new host, port
	end
	end

	def contains_point?(point, poly)
	c = false
	i = -1
	j = poly.size - 1
	while (i += 1) < poly.size
	if ((poly[i][:y] <= point[:y] && point[:y] < poly[j][:y]) \|\| (poly[j][:y] <= point[:y] && point[:y] < poly[i][:y]))
	if (point[:x] < (poly[j][:x] - poly[i][:x]) * (point[:y] - poly[i][:y]) / (poly[j][:y] - poly[i][:y]) + poly[i][:x])
	c = !c
	end
	j = i