bf4

List moved

Please use https://github.com/bf4/learning to fork and pull changes.

aaronfeng

Application specific host grouping in Riemann-dash

It is generally desirable to group all the hosts for a specific service into a single dashboard view. For example, all the web servers are in single view while all the database servers are in another view.

This is usually not an issue when you are sending custom metrics using Riemann client. However, there are cases where you are using something that you do not control how the metrics are being sent. i.e., Riemann-tools.

Since Riemann-tools scripts are application agnostic, in order for the dashboard view to group hosts, we must inject some application specific information into the tags field. Tags is a collection of arbitrary strings. In the case of Riemann-tools scripts you can pass in arbitrary strings on the command line.

riemann-health --host 127.0.0.1 --tag "prod" --tag "webserver"

kylefox

# Tell system when Xcode utilities live:
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

# Set "opendiff" as the default mergetool globally:
git config --global merge.tool opendiff

peterc

I'm a Rubyist with a lot of admiration for Python. Both languages are
similar (in the grand scheme of things) and each has huge pros and cons.

Python does not click for me in the same way as Ruby does not
click for perhaps the majority of programmer-kind. German doesn't click
for me either and 100m+ people speak that ;-) But I recently saw an
example of WHY Python taxes my Ruby brain a little.

I found some code at http://lukeplant.me.uk/blog/posts/why-learning-haskell-python-makes-you-a-worse-programmer/:

pt

class ThingController < ApplicationController

  def create_suck
    @thing      = Thing.new(params[:thing])

    respond_to do |format|
      if @thing.save
        format.html { redirect_to @thing, notice: 'thing was successfully created.' }
        format.json { render json: @thing, status: :created, location: @thing }
      else

andreyvit

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

mranney

From: Chris DeSalvo <[email protected]>
Subject: Why we can't process Emoji anymore
Date: Thu, 12 Jan 2012 18:49:20 -0800
Message-Id: <[email protected]>

--Apple-Mail=_6DEAA046-886A-4A03-8508-6FD077D18F8B
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=utf-8

burke

ruby-1.9.3-p327 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p327 with various performance improvements and a backported COW-friendly GC, all courtesy of funny-falcon.

Requirements

• rbenv
• ruby-build

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

dnagir

# RSpec 2.0 syntax Cheet Sheet by http://ApproachE.com

# defining spec within a module will automatically pick Player::MovieList as a 'subject' (see below)
module Player
	describe MovieList, "with optional description" do
		  
	  it "is pending example, so that you can write ones quickly"
	  
	  it "is already working example that we want to suspend from failing temporarily" do
		pending("working on another feature that temporarily breaks this one")

josevalim

# In your test_helper.rb
class ActiveRecord::Base
  mattr_accessor :shared_connection
  @@shared_connection = nil

  def self.connection
    @@shared_connection || retrieve_connection
  end
end