jellybob

Why do we need firewalls?

There are a few things which are typically referred to as "firewalls", with different purposes. All of them however control access to a network by restricting which ports and IP addresses can be connected to.

## Software Firewalls

This is the thing built into Windows and other operating systems that pops up boxes saying "Do you want to allow [thing x] to connect to the Internet?". They're designed to prevent malicious software that has been installed on your machine sending your data to other places, or bulk mailing people. They can also be used to restrict connections coming in to your computer.

## Hardware Firewalls

jellybob

namespace :db do
  namespace :test do
    task :prepare => :environment do
      abcs = ActiveRecord::Base.configurations

      [ "", "_data_warehouse" ].each do |db|
        # Dump the development database
        config = abcs["development#{db}"]
        cmd = "mysqldump -u#{config["username"]} -p#{config["password"]} #{config["database"]} --no-data > #{RAILS_ROOT}/db/development#{db}_structure.sql"
        `#{cmd}`

jellybob

task :stats => :statsetup

task :statsetup do
  fast_spec_dir = "fast_spec" # Change this if you keep them elsewhere.
  
  require 'rails/code_statistics'
  ::STATS_DIRECTORIES << %W(Fast\ specs #{fast_spec_dir}) if File.exist?(fast_spec_dir)
  ::CodeStatistics::TEST_TYPES << "Fast specs" if File.exist?(fast_spec_dir)
end

jellybob

traceroute to 193.219.108.20 (193.219.108.20), 64 hops max, 52 byte packets
 1  router (192.168.1.1)  1.018 ms  0.612 ms  0.725 ms
 2  * * *
 3  * 10.1.3.178 (10.1.3.178)  8.365 ms  8.364 ms
 4  20ge.bb2.lon1.uk.gbxs.net (195.66.224.231)  7.883 ms  7.640 ms  7.622 ms
 5  ohtelecom.vlan899.bb2.lon1.uk.gbxs.net (77.243.178.6)  8.212 ms  7.495 ms  8.612 ms
 6  * * *
 7  * * *
 8  * * *
# ad infinatum

jellybob

require 'capybara'
require 'capybara/dsl'
require 'capybara/webkit'
include Capybara::DSL

account = ARGV[0]
count = ARGV[1]

Capybara.current_driver = :webkit
Capybara.app_host = 'http://mobile.twitter.com'

jellybob

We couldn’t find that file to show.

jellybob

host "chef.example.org" do
  ip "192.168.10.1"
  aliases [ "chef", "kitchen" ]
  comment "The chef server"
end

jellybob

sh -c '
<%= "export http_proxy=\"#{knife_config[:bootstrap_proxy]}\"" if knife_config[:bootstrap_proxy] -%>

if [ ! -f /usr/bin/chef-client ]; then
  apt-get update
  apt-get install -y ruby ruby1.8-dev build-essential wget libruby-extras libruby1.8-extras
fi

# Install a sane version of gems
cd /tmp

jellybob

require 'rubygems'
require 'gelf'

class GELFHandler < Chef::Handler
  attr_reader :notifier

  def initialize(server, port, facility)
    @notifier = GELF::Notifier.new(server, port, 'WAN', :facility => facility)
  end

jellybob

require 'rubygems'
require 'gelf'

class GELFHandler < Chef::Handler
  attr_reader :notifier

  def initialize(server, port, facility)
    @notifier = GELF::Notifier.new(server, port, 'WAN', :facility => facility)
  end