Tamaño y distancia en el Sistema Solar
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Working with isolated environments: vagrant, lxc and puppet
In my daily work I have to switch between projects and databases a lot, forcing me to install lots of services: mongo, postgre, mysql, memcached, elasticsearch, and a lot more. This turned out to be a mess, difficult to maintain and reproduce.
I had tried Vagrant for virtualization, but I was not happy with the virtualbox performance: I don’t like wasting memory and CPU time. I was going to try KVM, but a friend suggest “LXC” (Linux Containers).
LXC is often considered as something in the middle between a chroot on steroids and a full fledged virtual machine
The combination with Vagrant is just amazing: superfast and stable. I love it. I can start and stop projects along all their services in a breeze. And the best part: Vagrant supports very nice puppet integration, so I have written some simple recipes to install everything a project needs. I can run “vagrant destroy” and “vagrant up” and have a new working environment in minutes. This is how the VagrantFile and recipe looks like:
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| include apt | |
| Exec { path => '/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin' } | |
| exec { "apt-update": | |
| command => "apt-get update" } | |
| exec { "install-bundler": | |
| command => "gem install bundler" } | |
| exec { "run-bundle": | |
| command => 'su - vagrant /bin/sh -c "cd /vagrant && bundle install"', | |
| path => '/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin', | |
| timeout => 3600 | |
| } | |
| exec { "ruby-switch": | |
| command => "/usr/bin/ruby-switch --set ruby2.0" } | |
| apt::ppa { 'ppa:brightbox/ruby-ng-experimental': } | |
| # Packages | |
| package { 'aptitude' : } | |
| package { 'git-core' : } | |
| package { 'build-essential' : } | |
| package { 'libqtwebkit-dev' : } | |
| package { 'libpq-dev' : } | |
| package { 'libxml2' : } | |
| package { 'libxml2-dev' : } | |
| package { 'libxslt-dev' : } | |
| package { 'default-jre' : } | |
| package { 'ffmpeg' : } | |
| package { 'libavcodec-extra-53':} | |
| package { 'x264':} | |
| package { 'libx264-dev':} | |
| package { 'nodejs':} | |
| package { 'gpac':} | |
| package { 'ruby2.0' : | |
| require => Apt::Ppa['ppa:brightbox/ruby-ng-experimental']} | |
| package { 'ruby2.0-dev' : | |
| require => Apt::Ppa['ppa:brightbox/ruby-ng-experimental']} | |
| package { 'ruby-switch' : | |
| require => Apt::Ppa['ppa:brightbox/ruby-ng-experimental']} | |
| package { 'postgresql-9.1' : } | |
| file { "/etc/postgresql/9.1/main/pg_hba.conf": | |
| owner => root, | |
| group => root, | |
| mode => 644, | |
| source => "/vagrant/environment/pg_hba.conf" | |
| } | |
| Package['ruby2.0'] -> | |
| Exec['ruby-switch'] -> | |
| Exec['install-bundler'] -> | |
| Exec['run-bundle'] | |
| Exec["apt-update"] -> Package <| |> |
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| # -*- mode: ruby -*- | |
| # vi: set ft=ruby : | |
| VAGRANTFILE_API_VERSION = "2" | |
| ENV['VAGRANT_DEFAULT_PROVIDER'] = 'lxc' | |
| Vagrant.configure(VAGRANTFILE_API_VERSION) do |config| | |
| config.vm.box = "precise64" | |
| config.vm.box_url = "http://bit.ly/vagrant-lxc-precise64-2013-10-23" | |
| config.vm.network :forwarded_port, guest: 3000, host: 3001 | |
| config.vm.provision :puppet do |puppet| | |
| puppet.manifests_path = "environment" | |
| puppet.manifest_file = "manifest.pp" | |
| puppet.module_path = "environment/modules" | |
| end | |
| end |
By the way, using Vagrant I got tired of using SSH to start thin. I foung a nice old tutorial (written for hardy!) that still works wonders to set up thin as a system service: http://articles.slicehost.com/2008/5/6/ubuntu-hardy-thin-web-server-for-ruby.
I have also heard about Docker with also uses LXC in the background, but it looked too complex for my needs :).
Making your life easier with Git
git config --global push.default current
git config --global color.ui true
http://stackoverflow.com/questions/948354/git-push-default-behavior
Capturando partículas cósmicas … con una pecera!
¿Quién se anima a reproducir el experimento? / Anyone willing to reproduce this?
Validando DNIs en Rails 3
Estaba buscando una solución fácil para validar el formato de los DNIs en Rails 3 y finalmente he añadido esto a mi aplicación:
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| validates_format_of :dni, :with => /\A[0-9]{8}[A-Za-z]\Z/, :on => :update, :message => "El DNI tiene que tener un formato como el siguiente: 12345678A" | |
| validate :dni_letter_must_match_number | |
| def dni_letter_must_match_number | |
| if "TRWAGMYFPDXBNJZSQVHLCKE"[dni[0..7].to_i % 23].chr != dni[8] | |
| errors.add(:dni, "La letra no coincide con el número") | |
| end | |
| end |
