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vaguerent/website/source/docs/vagrantfile/version.html.md
Seth Vargo 5093f3120e Merge docs and www into a single static site 
This is a big commit, and I apologize in advance for the future
git-blames all pointing to me. This commit does a few things:

1.  Merges the website/docs and website/www repo into a single website repo
    to be in line with other HashiCorp projects
2.  Updates to use middleman-hashicorp
3.  Converts less to scss to be in line with other projects
4.  Updates page styles to be in line with other projects
5.  Optimizes images
6.  Prepare for S3 + Fastly deployment with scripts, etc.
7.  Removes blog posts (they have been transferred to hashicorp.com with
    redirects in place
8.  Updated sitemap generation script for better SEO
9.  Fixed many broken links
10. Add description to all fields
2016-01-19 14:35:05 -05:00

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layout: "docs" page_title: "Configuration Version - Vagrantfile" sidebar_current: "vagrantfile-version" description: |- Configuration versions are the mechanism by which Vagrant 1.1+ is able to remain backwards compatible with Vagrant 1.0.x Vagrantfiles, while introducing dramatically new features and configuration options.

Configuration Version

Configuration versions are the mechanism by which Vagrant 1.1+ is able to remain backwards compatible with Vagrant 1.0.x Vagrantfiles, while introducing dramatically new features and configuration options.

If you run vagrant init today, the Vagrantfile will be in roughly the following format:

Vagrant.configure(2) do |config|
  # ...
end

The "2" in the first line above represents the version of the configuration object config that will be used for configuration for that block (the section between the do and the end). This object can be very different from version to version.

Currently, there are only two supported versions: "1" and "2". Version 1 represents the configuration from Vagrant 1.0.x. "2" represents the configuration for 1.1+ leading up to 2.0.x.

When loading Vagrantfiles, Vagrant uses the proper configuration object for each version, and properly merges them, just like any other configuration.

The important thing to understand as a general user of Vagrant is that within a single configuration section, only a single version can be used. You cannot use the new config.vm.provider configurations in a version 1 configuration section. Likewise, config.vm.forward_port will not work in a version 2 configuration section (it was renamed).

If you want, you can mix and match multiple configuration versions in the same Vagrantfile. This is useful if you found some useful configuration snippet or something that you want to use. Example:

Vagrant.configure("1") do |config|
  # v1 configs...
end

Vagrant.configure("2") do |config|
  # v2 configs...
end
What is Vagrant::Config.run? You may see this in Vagrantfiles. This was actually how Vagrant 1.0.x did configuration. In Vagrant 1.1+, this is synonymous with Vagrant.configure("1").