todgru

Let's Encrypt

Examples of getting certificates from Let's Encrypt working on Apache, NGINX and Node.js servers.

Obtain certificates

I chose to use the manual method, you have to make a file available to verify you own the domain. Follow the commands from running

git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt

Ruby Design Patterns - Methods over Attributes

Overview

The objective of this article is to highlight the subtle differences between using class attributes and class methods in Ruby. Both offer a valid way to manipulate the state of an instance of a class. Things can get increasingly complex, hard to test and hard to maintain as more instance variables are introduced. Beginner and intermediate Rubyists often miss this subtle but important point which can introduce bugs that may be hard to fix in their native habitat.

The reasons I prefer to use methods over instance variables:

Increases predictability of method calls
Increases predictability when testing

Setup redis-cli on AWS EC2

SSH into your EC2 instance. Run the following:

$ sudo yum install gcc This may return an "already installed" message. That's OK.

$ wget http://download.redis.io/redis-stable.tar.gz && tar xvzf redis-stable.tar.gz && cd redis-stable && make

See: http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/GettingStarted.ConnectToCacheNode.Redis.html

#Git Interactive Rebase

Scenario: We have a topic branch we've been working on. We want to combine the last few commits into one single commit. Our intention is to merge this topic branch, with one clean commit, into our main dev branch.

Solution: Git Rebase Interactive

Checkout your topic branch and look at your commit history:

$ git checkout topic-branch

SSH Tunnel

Our db is hosted on Amazon. Our web server can connect to the db. Connections to the db are not allowed outside of the web server.

Run ssh tunnel locally:

This creates a tunnel from my local machine to the web server:

ssh -N -L 3307:my-rds-db.us-east-1.rds.amazonaws.com:3306 ec2-my-web-server.compute-1.amazonaws.com

	var Aws = require('aws-sdk');
	var sinon = require('sinon');

	// Only works for 'createBucket', 'update' and a few others since most API methods are generated dynamically
	// upon instantiation. Very counterintuitive, thanks Amazon!
	var createBucket = sinon.stub(Aws.S3.prototype, 'createBucket');
	createBucket.yields(null, 'Me create bucket');

	// For other methods, we can 'assign' the stubs to the proto, already defined function won't be overridden
	var listBuckets = Aws.S3.prototype.listBuckets = sinon.stub();

	function List() {
	this.listSize = 0;
	this.pos = 0;
	this.dataStore = []; // initializes an empty array to store list elements
	this.clear = clear;
	this.find = find;
	this.toString = toString;
	this.insert = insert;
	this.append = append;
	this.remove = remove;

	# bash completion for rake
	#
	# some code from on Jonathan Palardy's http://technotales.wordpress.com/2009/09/18/rake-completion-cache/
	# and http://pastie.org/217324 found http://ragonrails.com/post/38905212/rake-bash-completion-ftw
	#
	# For details and discussion
	# http://turadg.aleahmad.net/2011/02/bash-completion-for-rake-tasks/
	#
	# INSTALL
	#

	# So we can send prefix to nested tmux sessions, then note that other tmux sessions may still use ctrl-b
	bind-key a send-prefix

	bind-key Up resize-pane -U
	bind-key Down resize-pane -D
	bind-key Left resize-pane -L
	bind-key Right resize-pane -R

	# unbind { key - i keep accidentally hitting it!
	unbind-key {

	#user nobody;
	worker_processes 1;

	error_log logs/error.log;
	#error_log logs/error.log notice;
	#error_log logs/error.log info;

	#pid logs/nginx.pid;