matschaffer

require 'gsl'
require 'time'

module Diskalerter
  class ThresholdEstimator
    attr_reader :timestamps, :signal, :threshold, :now

    # timestamps - a list of timestamps in epoch milliseconds
    # signal - a list of values for the provided timestamps
    # threshold - the "exhaustion" threshold (e.g., 100 for a percentage signal)

lusis

This uses terraform's template_file resource to generate a yaml properties file for serverspec to use.

• create the Rakefile in your terraform project root
• create a spec directory and put spec_helper.rb in it
• create the templates/properties.tmpl.yml file
• create the serverspec.tf
• terraform apply

tests

Tests will be matched based on roles defined for a given node.

petethepig

lewisd32

echo "Flipping tables! (╯°□°）╯︵ ┻━┻"

num_rules=3

real=3    # exposed to the ELB as port 443
test=4    # used to install test certs for domain verification
health=5  # used by the ELB healthcheck

blue_prefix=855
green_prefix=866

acolyer

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

• http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

• Does the design expect failures to happen regularly and handle them gracefully?
• Have we kept things as simple as possible?

lost-theory

Monitorama 2014 notes

http://monitorama.com/

Best talks day 1:

• Please, no More Minutes, Milliseconds, Monoliths... or Monitoring Tools! - Adrian Cockcroft
  • gave 5 good rules for monitoring systems, showed what cloud / microservices monitoring looks like @ Netflix
• Simple math to get some signal out of your noisy sea of data - Toufic Boubez
• explains why static alert thresholds don't work and gave 3 techniques to use instead

dhoer

require 'chef/chef_fs/knife'

class Chef
  class Knife
    class Deps < Chef::ChefFS::Knife
      banner "knife deps PATTERN1 [PATTERNn]"

      category "path-based"

      deps do

lusis

<!-- note that this requires the rabbitmq management plugin -->
<!-- also requires collectd 5.1 with curl_json plugin support -->
<Plugin curl_json>
<URL "http://localhost:55672/api/overview">
  Instance "rabbitmq_overview"
	User "guest"
	Password "guest"
	<Key "message_stats/publish">
		Type "counter"
	</Key>

gmr

Note: These work for us with Cobbler 2.2.3 and Chef 11.4.0 on CentOS

Quick Install

These are our install steps on CentOS 6:

mkdir -p ~/.chef/plugins/knife/
curl -o ~/.chef/plugins/knife/set_environment.rb https://gist.github.com/gmr/5339326/raw/5bd498d25bc2f4d17f029cdc4a34ed38e461fec2/set_environment.rb
curl -o /usr/lib/python2.6/site-packages/cobbler/modules/install_pre_chef.py https://gist.github.com/gmr/5339326/raw/0b248a8b40e5bac5673bd7df7cfd60185af778bc/install_pre_chef.py

curl -o /usr/lib/python2.6/site-packages/cobbler/modules/delete_post_chef.py https://gist.github.com/gmr/5339326/raw/ae71362ae721c0391f0be2f4b2166f3806e90a91/delete_post_chef.py

dcarley

#!/usr/bin/env ruby

require 'fog'
require 'graphviz'

ec2 = Fog::Compute.new(:provider => 'AWS')
graph = GraphViz::new("structs", "type" => "graph")

groups = ec2.security_groups
group_map = Hash[groups.collect { |g| [g.group_id, g.name] }]