Adrian Silva skiold

This uses terraform's template_file resource to generate a yaml properties file for serverspec to use.

create the Rakefile in your terraform project root
create a spec directory and put spec_helper.rb in it
create the templates/properties.tmpl.yml file
create the serverspec.tf
terraform apply

tests

Tests will be matched based on roles defined for a given node.

Learning FP the hard way: Experiences on the Elm language

by Ossi Hanhinen, @ohanhi

with the support of Futurice 💚.

Licensed under CC BY 4.0.

Editorial note

What is the appeal of dynamically-typed languages?

Kris Nuttycombe asks:

I genuinely wish I understood the appeal of unityped languages better. Can someone who really knows both well-typed and unityped explain?

I think the terms well-typed and unityped are a bit of question-begging here (you might as well say good-typed versus bad-typed), so instead I will say statically-typed and dynamically-typed.

I'm going to approach this article using Scala to stand-in for static typing and Python for dynamic typing. I feel like I am credibly proficient both languages: I don't currently write a lot of Python, but I still have affection for the language, and have probably written hundreds of thousands of lines of Python code over the years.

Running Docker on two hosts, bridged with Tinc

This Gist is similar to https://gist.github.com/noteed/8656989 which uses Open vSwitch instead of Tinc.

Setup

Download the install.sh script and run it:

> https://gist.githubusercontent.com/noteed/11031504/raw/install.sh

Running Docker on two hosts, bridged with Open vSwitch

This Gist shows how to use Open vSwitch to bridge Docker containers on two hosts. It is based on this blog post http://goldmann.pl/blog/2014/01/21/connecting-docker-containers-on-multiple-hosts/.

A similar Gist using Tinc instead of Open vSwitch is available: https://gist.github.com/noteed/11031504.

Setup

Embedded Variables

The ngx_http_core_module module supports embedded variables with names matching the Apache Server variables. First of all, these are variables representing client request header fields, such as $http_user_agent, $http_cookie, and so on. Also there are other variables:

$arg_name
argument name in the request line

Falsehoods programmers believe about prices

You can store a price in a floating point variable.
All currencies are subdivided in 1/100th units (like US dollar/cents, euro/eurocents etc.).
All currencies are subdivided in decimal units (like dinar/fils)
All currencies currently in circulation are subdivided in decimal units. (to exclude shillings, pennies) (counter-example: MGA)
All currencies are subdivided. (counter-examples: KRW, COP, JPY... Or subdivisions can be deprecated.)
Prices can't have more precision than the smaller sub-unit of the currency. (e.g. gas prices)
For any currency you can have a price of 1. (ZWL)
Every country has its own currency. (EUR is the best example, but also Franc CFA, etc.)

	#
	# This config file is a combination of ideas from:
	# http://www.37signals.com/svn/posts/1073-nuts-bolts-haproxy
	# http://www.igvita.com/2008/05/13/load-balancing-qos-with-haproxy/
	# http://wiki.railsmachine.com/HAProxy
	# http://elwoodicious.com/2008/07/15/nginx-haproxy-thin-fastcgi-php5-load-balanced-rails-with-php-support/
	# http://upstream-berlin.com/2008/01/09/using-haproxy-with-multiple-backends-aka-content-switching/
	# http://wiki.railsmachine.com/HAProxy
	# http://gist.github.com/raw/25482/d39fb332edf977602c183194a1cf5e9a0b5264f9
	#

	$ curl --dump-header - localhost:12345
	HTTP/1.0 404 Not Found
	Content-Type: text/html
	Content-Length: 43
	Date: Fri, 05 Dec 2014 17:48:56 +0000

	<html>
	<body>
	<h1>WUT</h1>
	</html>

	# using such a setup requires `apt-get install lua-nginx-redis` under Ubuntu Trusty
	# more info @ http://wiki.nginx.org/HttpLuaModule#access_by_lua

	http {
	lua_package_path "/etc/nginx/include.d/?.lua;;";
	lua_socket_pool_size 100;
	lua_socket_connect_timeout 10ms;
	lua_socket_read_timeout 10ms;

	server {