headius

Algorithm

1. A secret byte you want to read is stored at inaccessible memory location priv_mem.
2. The sender triggers an access exception by attempting to read priv_mem.
3. Due to CPU optimization (out-of-order execution), the load of secret from priv_mem and the use of its value in (4) and (5) below may execute before the exception is triggered.
4. Calculate an offset into a known array probe by multiplying secret by the width of a cache line (or whatever block size the CPU typically fetches, like a 4096-byte page). This guarantees each of those 256 possible offsets will cache separately.
5. Load probe[offset], which causes the CPU to cache exactly one chunk of of our array, populating one cache line.
6. The exception finally triggers, clearing the modified registers...but cached data is not excised.
7. Iterate over all 256 offsets into probe to find out which one loads fast. You've determined the value of secret.

deviantony

DEPRECATION NOTICE

This gist is now deprecated in favor of our official documentation: https://documentation.portainer.io/api/api-examples/ which contains up to date examples!

THE FOLLOWING DOCUMENTATION IS DEPRECATED

Please refer to the link above to get access to our updated API documentation and examples.

amir-rahnama

es-master:
  image: 'elasticsearch:latest'
  command: 'elasticsearch --network.host=0.0.0.0 --node.master=true --cluster.name=escluster'
  restart: always
es-develop:
  image: 'elasticsearch:latest'
  command: 'elasticsearch --network.host=0.0.0.0 --cluster.name=escluster --discovery.zen.ping.unicast.hosts=es-master'
  deployment_strategy: high_availability
  links:
    - es-master

modius

elasticsearch:
  image: 'elasticsearch:1.5'
  ports:
  - '9200:9200'

logstash:
  image: 'logstash'
  command: 'logstash -e "input { syslog { port => 12345 type => "docker" } } output { elasticsearch { hosts => "elasticsearch" } }"'
  expose:
  - '12345/tcp'

bf4

Relevant Rails PRs

• rails/rails#16052
  • https://github.com/rails/rails/commit/9e42cf019f2417473e7dcbfcb885709fa2709f89
• https://github.com/rails/rails/commit/2c46d6db4feaf4284415f2fb6ceceb1bb535f278
• https://github.com/rails/rails/commit/39f2c3b3ea6fac371e79c284494e3d4cfdc1e929
• https://github.com/rails/rails/commit/bdc5141652770fd227455681cde1f9899f55b0b9
• https://github.com/rails/rails/commit/d26dd00854c783bcb1249168bb3f4adf9f99be6c

h/t to http://juanitofatas.com/2015/01/31/rails-5-active-record-or/ for some more useful links

bholloway

Composition

It is important not to hide composition. It should be done centrally, at the root of the application.

In angular there are 2 different resources we must compose in order to build an application

• Using a composition root we map directives, controllers, and services into the injector.

• Using routing we compose views from HTML partials and controllers for each different application state.

bpartridge

# This file extends and overrides parts of the ActiveAdmin DSL and internals
# in order to provide support for automatically displaying and editing images,
# which in our infrastructure are stored as URLs whose column names end in "img".
# Since this file will be reloaded frequently in the development environment,
# all operations done at load time (class_eval's, etc.) MUST be idempotent.

ActiveAdmin::Views::TableFor.class_eval do

  def img_column(col_sym=:img, title="Image")
    column title, sortable: false do |obj|

ericboehs

module Capybara::Poltergeist
  class Client
    private
    def redirect_stdout(to)
      prev = STDOUT.dup
      prev.autoclose = false
      $stdout = to
      STDOUT.reopen(to)

      prev = STDERR.dup

DouweM

# This is a program trying to implement Verbal Expressions
# See this for more info - http://verbalexpressions.github.io/

def VerEx
  VerExClass.new
end

class VerExClass
  attr_accessor :regex
  

bigfive

module ActiveAdminHelper

  def admin_arbre_context
    @admin_arbre_context ||= Arbre::Context.new(assigns, self)
  end

  def default_renderer
    case controller.send(:resource_class).name
    when "ActiveAdmin::Page"
      "page"