ryancdotorg

#!/usr/bin/env python
  
import random
import struct
import sys

# Most of the Fat32 class was cribbed from https://gist.github.com/jonte/4577833
  
def ppNum(num):
  return "%s (%s)" % (hex(num), num)

rmoriz

Requirements

• VirtualBox
• Vagrant
• Packer
• a Mac with a lot of Memory/CPU/Disk
• great Templates/Tools from https://github.com/timsutton/osx-vm-templates

Steps

grugq

Operational PGP

This is a guide on how to email securely.

There are many guides on how to install and use PGP to encrypt email. This is not one of them. This is a guide on secure communication using email with PGP encryption. If you are not familiar with PGP, please read another guide first. If you are comfortable using PGP to encrypt and decrypt emails, this guide will raise your security to the next level.

ahupowerdns

If you note that some of your users are sending you queries to weirdly named domains
(sdfhsdfkh.www.7xinggua.com. for example), and that those queries in turn are contributing 
to a denial of service attack to "nameservers" behind those weirdly named domains, this page 
may be for you. The instructions are for Linux, but other operating systems will offer 
similar ways to filter traffic.

PowerDNS Recursor 3.6.0 out of the box comes with settings that try to limit this attack, 
but there is only so much we can do. A better way is to block or deflect traffic from those 
sending the queries. 

lelandbatey

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

mattiaslundberg

# Install ARCH Linux with encrypted file-system and UEFI
# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

# Download the archiso image from https://www.archlinux.org/
# Copy to a usb-drive
dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

# Set swedish keymap

heptal

Displaying images in the terminal with tput and echo

Requires ImageMagick, easily available from your favorite package manager. Tested on Linux and OSX

convert image.png -resize 40 txt:-|sed -E 's/://;s/\( ? ?//;s/, ? ?/,/g;s/\)//;s/([0-9]+,[0-9]+,[0-9]+),[0-9]+/\1/g;s/255/254/g;/mage/d'|awk '{print $1,$2}'|sed -E 's/^0,[0-9]+ /print "echo;tput setaf "\;/;s/^[0-9]+,[0-9]+ /print "tput setaf ";/;s/(.+),(.+),(.+)/\1\/42.5*36+\2\/42.5*6+\3\/42.5+16/'|bc|sed 's/$/;echo -n "  ";/'|tr '\n' ' '|sed 's/^/tput rev;/;s/; /;/g;s/$/tput sgr0;echo/'|bash

paulczar

Logstash Performance Testing

Server Details

HP BL460

• 48 Gb Memory
• 2 x X5675 @ 3.07GHz
• 2 x 10 gbps NIC
• 2tb NetApp NFS volume for ES data

stonith

curl -XPUT localhost:9200/_template/logstash -d '
{
  "template" : "logs-*",
  "settings" : {
  	"index.analysis.analyzer.default.type": "simple",
	"index.cache.field.type": "soft",
    "index.compress.stored": true,
    "index.merge.policy.max_merged_segment": "5g",
    "index.query.default_field": "@message",
    "index.refresh_interval": "5s",

matschaffer

require 'rubygems'
require 'chef/encrypted_data_bag_item'

secret = Chef::EncryptedDataBagItem.load_secret('data_bag_key')
data = {"id" => "mysql", "root" => "some secret password"}
encrypted_data = Chef::EncryptedDataBagItem.encrypt_data_bag_item(data, secret)

FileUtils.mkpath('data_bags/passwords')
File.open('data_bags/passwords/mysql.json', 'w') do |f|
  f.print encrypted_data.to_json