colmmacc

import sys

# choose() is the same as computing the number of combinations. Normally this is
# equal to:
#
#   factorial(N) / (factorial(m) * factorial(N - m))
#
# but this is very slow to run and requires a deep stack (without tail
# recursion).
#

charity

$ for svc in $(aws list 3>&1 1>&2 2>&3 3>&- | sed -e '1,7d' |sed -e 's/\|//g') ; do aws $svc describe-account-attributes 2>/dev/null || echo "not supported for $svc" ; done

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

philandstuff

mark shuttleworth, juju

q&a

• security?
  • same issue as docker images from dockerhub
  • http://twitter.com/nixgeek/status/694103481909649409

mitchellh, vault

tobert

#!/bin/bash
# This script creates a 128MB loopback file + device then puts
# dm-delay in front of it to cause all IOs to take >= 500ms.

bytes=$((2**27)) # 134217728 or 128MB
blocks=$(($bytes / 512)) # 262144

# create the loopback file
dd if=/dev/zero of=/srv/tmp.img bs=512 count=$(($blocks + 32))

GABeech

# This is an example of the Stack Exchange Tier 1 HAProxy config
# The only things that have been changed from what we are running are: 
# 1. User names have been removed
# 2. All Passwords have been remove
# 3. IPs have been changed to use the example/documentation ranges
# 4. Rate limit numbers have been changed to randome numbers, don't read into them

userlist stats-auth
        group admin users $admin_user
        user $admin_user insecure-password $some_password

chrisboulton

#!/bin/bash
set -e

VERSION=0.10.12

BUILD_DIR=`mktemp -d`
trap "rm -rf -- $BUILD_DIR" EXIT

export DESTDIR=$BUILD_DIR/build
ARCHIVE=node-v$VERSION

chrisboulton

# DISCLOSURE: it is a HORRIBLE, HORRIBLE idea for you to blindly run the
# below unless you absolutely know what each and every command does and
# have a system where you can test first, have appropriate backups etc.

# this is not a script - you should run every command and keep a very
# close eye on the output for anything unexpected.

apt-get install libaio1

apt-get install -d percona-server-client-5.5 percona-server-server-5.5 percona-server-server-5.5 libmysqlclient18=5.5.31-rel30.3-520.squeeze libmysqlclient-dev=5.5.31-rel30.3-520.squeeze

josegonzalez

- certain endpoints are always blocked
if nginx_uri == "/_access_token" or nginx_uri == "/_me" then
    ngx.exit(403)
end

-- import requirements
local cjson = require "cjson"

-- setup some app-level vars
local app_id = "APP_ID"

josegonzalez

#!/bin/bash

#####
# Builds a custom nginx
#
# RELEASE_TAGS="+your+tags+here"
# RELEASE_MAINTAINER="Your Name Here"
# RELEASE_MAINTAINER_EMAIL="hi@example.com"
# RELEASE_MESSAGE="Some message"
#