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module System
  extend self
  def cpu_count
    return Java::Java.lang.Runtime.getRuntime.availableProcessors if defined? Java::Java
    return File.read('/proc/cpuinfo').scan(/^processor\s*:/).size if File.exist? '/proc/cpuinfo'
    require 'win32ole'
    WIN32OLE.connect("winmgmts://").ExecQuery("select * from Win32_ComputerSystem").NumberOfProcessors
  rescue LoadError
    Integer `sysctl -n hw.ncpu 2>/dev/null` rescue 1
  end

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set :application, '<APP_NAME>'
set :repo_url, "<git@PATH/REPO.git>"

# ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }

set :deploy_to, "/home/deploy/rails/<APP_NAME>"
# set :scm, :git

set :format, :pretty
set :log_level, :debug

rrichards

Most instructions for using Capistrano tell you how to make it restart Phusion Passenger by 'touch'ing the restart.txt file, but this doesn't immediately restart the app - instead the first person to try to use the application will cause it to be restarted, so they will see a delay of at least a few seconds.

This shows how to add a post-deploy task to 'ping' the server, to cause it to restart immediately.

Then add a deploy:ping task to config/deploy.rb and set it to run automatically after deploy:restart. Alternatively you could put it into the deploy:restart task directly.

TODO: Test the response HTTP header of the ping, that it is a 200, and not some other error response (404/500).

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namespace :postgres do
  
  desc 'Backup postgres database'
  task :backup => :environment do
    db_config = Rails.application.config.database_configuration[Rails.env]
    backup_dir = '/home/deploy/backups'
    outfile  = "#{ backup_dir }/#{ Rails.env }_#{ DateTime.now.strftime("%Y%m%d_%H%M%S.sql.gz") }"
    cmd = "pg_dump -h localhost -U #{ db_config['username'] } #{ db_config['database'] } | gzip -c > #{outfile}"
    
    puts "Making database backup..."

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application:open-your-keymap
application:open-your-stylesheet
autocomplete:attach
autoflow:reflow-paragraph
bookmarks:clear-bookmarks
bookmarks:jump-to-next-bookmark
bookmarks:jump-to-previous-bookmark
bookmarks:toggle-bookmark
bookmarks:view-all
check:correct-misspelling

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#!/usr/bin/env ruby
require "nokogiri"

# opens every file in the given dir tree and converts any html img tags to rails image_tag calls
#
# example usage: 
# ruby convert.rb ~/my_rails_app/app/views
#
# ***be careful and backup before using this***
#

rrichards

How to patch Ubuntu for Heartbleed

1. sudo apt-get update
2. sudo apt-get install -y libssl1.0.0 openssl
3. openssl version -a and confirm the "built on" date is >= 2014-04-07
4. sudo lsof -n | grep ssl | grep DEL and restart all listed services.

Repeat #4 until no results are returned.

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Add this to /etc/apt/sources.list
<snip>
deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
</snip>

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Docker Cheat Sheet

Why

Why Should I Care (For Developers)

"Docker interests me because it allows simple environment isolation and repeatability. I can create a run-time environment once, package it up, then run it again on any other machine. Furthermore, everything that runs in that environment is isolated from the underlying host (much like a virtual machine). And best of all, everything is fast and simple."

TL;DR, I just want a dev environment

rrichards

require "open3"

def readfile(file)

	f = File.open(file)
	lines = f.readlines("\n\n\n\n")
	lines.each do |line|
		fields = line.scan(/\s+Date:\s([^\n]+)$\s+Topic:\s([^\n]+)\n(.*)/m)

		date = fields[0][0].strip