Dmitriy Zaporozhets dzaporozhets

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:

Steps to migrate from SVN to GitLab

This process worked for me. I take no responsibility for any damage or loss incurred as a result of following or not following these steps or, for that matter, anything else you might do or not do.

Setup

SVN is hosted at svn.domain.com.au.
SVN is accessible via http (other protocols should work).
GitLab is hosted at git.domain.com.au and:

	def select_from_chosen(item_text, options)
	field = find_field(options[:from])
	option_value = page.evaluate_script("$(\"##{field[:id]} option:contains('#{item_text}')\").val()")
	page.execute_script("$('##{field[:id]}').val('#{option_value}')")
	end

	.hll { background-color: #ffffcc }
	.c { color: #586E75 } /* Comment */
	.err { color: #93A1A1 } /* Error */
	.g { color: #93A1A1 } /* Generic */
	.k { color: #859900 } /* Keyword */
	.l { color: #93A1A1 } /* Literal */
	.n { color: #93A1A1 } /* Name */
	.o { color: #859900 } /* Operator */
	.x { color: #CB4B16 } /* Other */
	.p { color: #93A1A1 } /* Punctuation */

	#!/usr/bin/env ruby

	# This script can be used to generate a list of authors for each source file,
	# for inclusion in the copyright header.

	require 'rugged'
	require 'set'

	repo = Rugged::Repository.new(".")

	#! /usr/bin/env ruby

	$LOAD_PATH.unshift '/Users/schacon/projects/git/rugged/lib'
	require 'rugged'

	require 'rubygems'
	require 'pp'

	dir, id = "/opt/linux.git"

	To install redis from debian backports we need to add the backports sources.

	1. Add to /etc/apt/sources.list:

	deb http://backports.debian.org/debian-backports squeeze-backports main

	2. Retrieve debian key

	$ gpg --keyserver pgp.mit.edu --recv-keys AED4B06F473041FA

	#!/bin/sh

	#
	# For each ref, validate the commit.
	#
	# - It disallows deleting branches without a /.
	# - It disallows non fast-forward on branches without a /.
	# - It disallows deleting tags without a /.
	# - It disallows unannotated tags to be pushed.

	#Model

	@user.should have(1).error_on(:username) # Checks whether there is an error in username
	@user.errors[:username].should include("can't be blank") # check for the error message

	#Rendering
	response.should render_template(:index)

	#Redirecting
	response.should redirect_to(movies_path)

	apt-get install xvfb
	apt-get install firefox