julianlam

Provisioning and usage of unprivileged LXC containers via indirect login or script

As I've discovered, managing LXC containers is fairly straightforward, but when building out a system for provisioning out user maintained instances of NodeBB, it was imperative that unprivileged LXC containers were used, so that in the event of shell breakout from NodeBB followed by privilege escalation of the saas user, the root user in the LXC container would only be an unprivileged user on the host machine.

During the course of development, I ran into numerous blockers when it came to managing LXC containers in unexpected circumstances. Namely:

• Using LXC in a subshell is not directly supported. This usually happens under one of the following two circumstances:
  • After switching users via su or executing lxc-* commands as another user via sudo
  • Executing lxc-* commands via a program, application, or script. In my case, a Node.js application.

bodiam

* {
    font-size: 12pt;
    font-family: monospace;
    font-weight: normal;
    font-style: normal;
    text-decoration: none;
    color: black;
    cursor: default;
}

myronmarston

I highly suspect that the RSpec core team all use black backgrounds in their terminals because sometimes the colors aren’t so nice on my white terminal

I certainly use a black background. I'm not sure about the other RSpec core folks. Regardless, if there are some color changes we can make that would make output look good on a larger variety of backgrounds, we'll certainly consider that (do you have some suggested changes?). In the meantime, the colors are configurable, so you can change the colors to fit your preferences on your machine. First, create a file at

sunaot

module Ruby
  module Spock
    def spec(description, definition = nil, &proc_definition)
      raise ArgumentError if [ definition, proc_definition ].all? {|d| d.nil? }
      if definition.nil?
        spec_runner(description, proc_definition)
      else
        spec_runner(description, definition)
      end
    end

c4milo

Digesting VMDK spec

Particularly, virtual disks types are very confusing. This document is an attempt to disentangle that and make easier the design of an implementation.

Flat or preallocated disk

• Monolithic or one-file: Single flat extent with separate descriptor file. createType: monolithicFlat
• Split or multiple files: 2gb preallocated extents or smaller, to account for file system limits. createType: 2GbMaxExtentFlat
• VMFS (managed):
  • Zeroed: Thick (flat) disk on VMFS, with blocks zeroed on first use. createType: vmfsPreallocated

JulienPalard

#!/usr/bin/env python


def curry(func):
    """
    Decorator to curry a function, typical usage:

    >>> @curry
    ... def foo(a, b, c):
    ...    return a + b + c

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

geemus

require 'excon'
require 'securerandom'

def multipart_form_data(buildpack_file_path)
  body      = ''
  boundary  = SecureRandom.hex(4)
  data      = File.open(buildpack_file_path)

  data.binmode if data.respond_to?(:binmode)
  data.pos = 0 if data.respond_to?(:pos=)

prwhite

# Add the following 'help' target to your Makefile
# And add help text after each target name starting with '\#\#'
 
help:           ## Show this help.
	@fgrep -h "##" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -e 's/\\$$//' | sed -e 's/##//'
 
# Everything below is an example
 
target00:       ## This message will show up when typing 'make help'
	@echo does nothing

razor-x

desc 'Generate deck from Travis CI and publish to GitHub Pages.'
task :travis do
  # if this is a pull request, do a simple build of the site and stop
  if ENV['TRAVIS_PULL_REQUEST'].to_s.to_i > 0
    puts 'Pull request detected. Executing build only.'
    sh 'bundle exec rake build'
    next
  end

  repo = %x(git config remote.origin.url).gsub(/^git:/, 'https:').strip