Huiming Teo teohm

Docker Cheat Sheet

Why

I don't care, I just want a dev environment

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:

	cd ~
	sudo apt-get update
	sudo apt-get install openjdk-7-jre-headless -y


	### Check http://www.elasticsearch.org/download/ for latest version of ElasticSearch and replace wget link below

	# NEW WAY / EASY WAY
	wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.90.7.deb
	sudo dpkg -i elasticsearch-0.90.7.deb

	require 'rubygems'
	require 'ohai'

	@ohai = Ohai::System.new
	@ohai.all_plugins
	puts @ohai[:platform]

	#!/usr/bin/env ruby

	require 'rubygems'

	gempaths = Gem::default_path

	puts
	puts "Scanning paths in Gem::default_path for RubyGems with native extensions ..."
	puts

	# First install tmux
	brew install tmux

	# For mouse support (for switching panes and windows)
	# Only needed if you are using Terminal.app (iTerm has mouse support)
	Install http://www.culater.net/software/SIMBL/SIMBL.php
	Then install https://bitheap.org/mouseterm/

	# More on mouse support http://floriancrouzat.net/2010/07/run-tmux-with-mouse-support-in-mac-os-x-terminal-app/

	# A sample Guardfile
	# More info at https://github.com/guard/guard#readme

	require 'guard/guard'
	require 'mixlib/shellout'

	module ::Guard
	class Kitchen < ::Guard::Guard
	def start
	::Guard::UI.info("Guard::Kitchen is starting")

	set :sync_directories, ["public/assets", "public/galleries"]
	set :sync_backups, 3

	createuser --password USERNAME
	createdb --owner=USERNAME DATABASE_NAME

	# Provides the ability to unscope associations, this solves problems described in
	# http://stackoverflow.com/questions/1540645/how-to-disable-default-scope-for-a-belongs-to/11012633#11012633
	#
	# Examples
	#
	# class Document < ActiveRecord::Base
	# default_scope where(deleted: false)
	# end
	#
	# class Comment < ActiveRecord::Base