packer-config

A Ruby model that lets you build Packer configurations in Ruby.

Building the Packer JSON configurations in raw JSON can be quite an adventure. There's limited facilities for variable expansion and absolutely no support for nice things like comments. I decided it would just be easier to have an object model to build the Packer configurations in that would easily write to the correct JSON format. It also saved me having to remember the esoteric Packer syntax for referencing variables and whatnot in the JSON.

Bonus: you can really go to town with templates when it's all done it Ruby.

Installation

gem install packer-config

Use

Builders

The following Packer builders are currently implemented:

Provisioners

The following Packer provisioners are currently implemented:

Post-Processors

The following Packer post-processors are currently implemented:

Examples

Packing a Vagrant Basebox from a CentOS ISO Using VirtualBox

This example is based on the integration test spec/integration/centos_vagrant_spec.rb. It produces a Vagrant Basebox that's provisionable with Chef and the packer config and provisioning is taken from the Bento project from the OpsCode crew.

OS = 'centos-6.6'

pconfig = Packer::Config.new "#{OS}-vagrant.json"
pconfig.description "#{OS} VirtualBox Vagrant"
pconfig.add_variable 'mirror', 'http://mirrors.sonic.net/centos/'
pconfig.add_variable 'my_version', '0.0.1'
pconfig.add_variable 'chef_version', 'latest'

builder = pconfig.add_builder Packer::Builder::VIRTUALBOX_ISO
builder.boot_command ["<tab> text ks=http://#{pconfig.macro.HTTPIP}:#{pconfig.macro.HTTPPort}/#{OS}-ks.cfg<enter><wait>"]
builder.boot_wait '10s'
builder.disk_size 40960
builder.guest_additions_path "VBoxGuestAdditions_#{pconfig.macro.Version}.iso"
builder.guest_os_type "RedHat_64"
builder.http_directory "scripts/kickstart"
builder.iso_checksum '08be09fd7276822bd3468af8f96198279ffc41f0'
builder.iso_checksum_type 'sha1'
builder.iso_url "#{pconfig.variable 'mirror'}/6.6/isos/x86_64/CentOS-6.6-x86_64-bin-DVD1.iso"
builder.output_directory "#{OS}-x86_64-virtualbox"
builder.shutdown_command "echo 'vagrant'|sudo -S /sbin/halt -h -p"
builder.ssh_password "vagrant"
builder.ssh_port 22
builder.ssh_username "vagrant"
builder.ssh_wait_timeout "10000s"
builder.vboxmanage [
  [
    "modifyvm",
    pconfig.macro.Name,
    "--memory",
    "480"
  ],
  [
    "modifyvm",
    pconfig.macro.Name,
    "--cpus",
    "1"
  ]
]
builder.virtualbox_version_file ".vbox_version"
builder.vm_name "packer-#{OS}-x86_64"

provisioner = pconfig.add_provisioner Packer::Provisioner::FILE
provisioner.source 'scripts/hello.sh'
provisioner.destination '/home/vagrant/hello.sh'

provisioner = pconfig.add_provisioner Packer::Provisioner::SHELL
provisioner.scripts [
  'scripts/fix-slow-dns.sh',
  'scripts/sshd.sh',
  'scripts/vagrant.sh',
  'scripts/vmtools.sh',
  'scripts/chef.sh',
  'scripts/cleanup.sh',
  'scripts/minimize.sh'
]
provisioner.environment_vars [
  "CHEF_VERSION=#{pconfig.variable 'chef_version'}",
  "MY_VERSION=#{pconfig.variable 'my_version'}"
]
provisioner.execute_command "echo 'vagrant' | #{pconfig.macro.Vars} sudo -S -E bash '#{pconfig.macro.Path}'"

postprocessor = pconfig.add_postprocessor Packer::PostProcessor::VAGRANT
postprocessor.output File.join('builds', pconfig.macro.Provider, "#{OS}-x86_64-#{pconfig.variable 'my_version'}.box")

pconfig.validate
pconfig.build

Development

Continuous Integration

I'm using Travis CI to build and test on every push to the public github repository. You can find the Travis CI page for this project here: https://travis-ci.org/ianchesal/packer-config/

Branching in Git

I'm using git-flow for development in git via github. I've loved the branching model git-flow proposed from day one and the addon to git makes it very intuitive and easy to follow. I generally don't push my feature/* branches to the public repository; I do keep development and master up to date here though.

TODO Work

Please see TODO.md for the short list of big things I thought worth writing down.

Contact Me

Questions or comments about packer-config? Hit me up at [email protected] or [email protected].