SK SafeAF

Encrypting text fields in Mongoose is easy using Node's built-in crypto module. You might want to do this if you're using MongoDB as a service (see the recent MongoHQ security breach); or, if you're storing OAuth tokens that could, in the wrong hands, screw with somebody's account on a 3rd party service. (Of course, you should never encrypt passwords: those should be hashed.)

Imagine you have a Mongoose model like that shown below, which is modified only slighly from the example on the MongooseJS homepage.

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test');

var User = mongoose.model('User', {
 name: String,

Refactoring

You don't understand your code unless you can execute it in your head.. in the shower. Pro-points if you can decompose down to assembly and execute.
You learn as much or more about your code through refactoring as when you wrote it the first time, especially applies to architecture.
Refactoring is very often architecture centric/focused (code&data flow/paths, abstraction, composition, systems, coupling & interfaces) vs implementation ( flow control, conditions/constraints, data, operations etc). This makes architecture higher level and therefore requiring deeper thought and different thought processes.
Anytime you are building systems/writing code for even mildly complex programs it is key to map it out on paper first. It seems trivial to the uniniated but it is a definite classifer regarding pro vs nube engineers.
Don't be afraid of breaking things, after all you wrote tests right? YOU DID WRITE TESTS DIDNT YOU?!?! Ouch, that one stings..

SJK

Commands examples

If the namespace is not used then the commands will perform on top of the default database. bundle exec rake db:create bundle exec rake db:migrate

By using the namespace we are going to use all the configuration for our alternate DB. bundle exec rake store:db:create bundle exec rake store:db:migrate


	source "https://rubygems.org"

	gem 'eventmachine'
	gem 'rubysl-stringio'
	gem 'sinatra'
	gem 'yajl-ruby', require: 'yajl'
	gem 'thin'
	gem 'em-websocket', :git=>'https://github.com/igrigorik/em-websocket.git'


	function computeDistance(startCoords, destCoords) {
	var startLatRads = degreesToRadians(startCoords.latitude);
	var startLongRads = degreesToRadians(startCoords.longitude);
	var destLatRads = degreesToRadians(destCoords.latitude);
	var destLongRads = degreesToRadians(destCoords.longitude);

	var Radius = 6371; // radius of the Earth in km
	var distance =
	Math.acos(Math.sin(startLatRads) * Math.sin(destLatRads) +

	require 'active_record'
	require 'sqlite3'
	require 'logger'

	ActiveRecord::Base.logger = Logger.new('debug.log')
	ActiveRecord::Base.configurations = YAML::load(IO.read('database.yml'))
	ActiveRecord::Base.establish_connection('development')

	class Schema < ActiveRecord::Migration
	def change

	initialize ten workers. Each worker is responsible for keeping track of the work she has completed, @percent, and then reporting that progress on her own line, @index, of the console.

	#!/usr/bin/env ruby

	require 'curses'

	Curses.noecho
	Curses.init_screen

	class Worker

	development:
	# Configure available database clients. (required)
	clients:
	# Defines the default client. (required)
	default:
	# Defines the name of the default database that Mongoid can connect to.
	# (required).
	database: my_db
	# Provides the hosts the default client can connect to. Must be an array
	# of host:port pairs. (required)

	#For example, to use the default recipe in a role named "base", use 'ruby' in the run list and set the node[:languages[:ruby][:default_version] attribute:


	{
	"name": "base",
	"description": "Base role is applied to all systems",
	"json_class": "Chef::Role",
	"default_attributes": {
	},
	"override_attributes": {

	# changes from http://www.cyberciti.biz/faq/linux-kernel-etcsysctl-conf-security-hardening/

	# Protect ICMP attacks
	net.ipv4.icmp_echo_ignore_broadcasts = 1

	# Turn on protection for bad icmp error messages
	net.ipv4.icmp_ignore_bogus_error_responses = 1

	# Turn on syncookies for SYN flood attack protection
	net.ipv4.tcp_syncookies = 1