80 lines
3.2 KiB
Markdown
80 lines
3.2 KiB
Markdown
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---
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layout: "intro"
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page_title: "Vagrant Boxes"
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prev_url: "/intro/getting-started/parallel-builds.html"
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next_url: "/intro/getting-started/next.html"
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next_title: "Next Steps"
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---
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# Vagrant Boxes
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Packer also has the ability to take the results of a builder (such as
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an AMI or plain VMware image) and turn it into a [Vagrant](http://www.vagrantup.com)
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box.
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This is done using [post-processors](/docs/templates/post-processors.html).
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These take an artifact created by a previous builder or post-processor and
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transforms it into a new one. In the case of the Vagrant post-processor, it
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takes an artifact from a builder and transforms it into a Vagrant box file.
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Post-processors are a generally very useful concept. While the example on
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this getting-started page will be creating Vagrant images, post-processors
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have many interesting use cases. For example, you can write a post-processor
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to compress artifacts, upload them, test them, etc.
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Let's modify our template to use the Vagrant post-processor to turn our
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AWS AMI into a Vagrant box usable with the [vagrant-aws plugin](https://github.com/mitchellh/vagrant-aws). If you followed along in the previous page and setup DigitalOcean,
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Packer can't currently make Vagrant boxes for DigitalOcean, but will be able
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to soon.
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## Enabling the Post-Processor
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Post-processors are added in the `post-processors` section of a template, which
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we haven't created yet. Modify your `example.json` template and add the section.
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Your template should look like the following:
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<pre class="prettyprint">
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{
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"builders": [...],
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"provisioners": [...],
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"post-processors": ["vagrant"]
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}
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</pre>
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In this case, we're enabling a single post-processor named "vagrant". This
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post-processor is built-in to Packer and will create Vagrant boxes. You
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can always create [new post-processors](/docs/extend/post-processor.html), however.
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The details on configuring post-processors is covered in the
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[post-processors](/docs/templates/post-processors.html) documentation.
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Validate the configuration using `packer validate`.
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## Using the Post-Processor
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Just run a normal `packer build` and it will now use the post-processor.
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Since Packer can't currently make a Vagrant box for DigitalOcean anyways,
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I recommend passing the `-only=amazon-ebs` flag to `packer build` so it only
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builds the AMI. The command should look like the following:
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```
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$ packer build -only=amazon-ebs example.json
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```
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As you watch the output, you'll notice at the end in the artifact listing
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that a Vagrant box was made (by default at `packer_aws.box` in the current
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directory). Success!
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But where did the AMI go? When using post-processors, Vagrant removes
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intermediary artifacts since they're usually not wanted. Only the final
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artifact is preserved. This behavior can be changed, of course. Changing
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this behavior is covered [in the documentation](/docs/templates/post-processors.html).
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Typically when removing intermediary artifacts, the actual underlying
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files or resources of the artifact are also removed. For example, when
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building a VMware image, if you turn it into a Vagrant box, the files of
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the VMware image will be deleted since they were compressed into the Vagrant
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box. With creating AWS images, however, the AMI is kept around, since Vagrant
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needs it to function.
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