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Merge pull request #18350 from KFishner/master 

Add 0.12 upgrade guide
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website/layouts/downloads.erb
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<li<%= sidebar_current("upgrade-guides") %>>
<a href="/upgrade-guides/index.html">Upgrade Guides</a>
<ul class="nav">
<li<%= sidebar_current("upgrade-guides-0-12") %>>
<a href="/upgrade-guides/0-12.html">Upgrading to v0.12</a>
</li>
<li<%= sidebar_current("upgrade-guides-0-11") %>>
<a href="/upgrade-guides/0-11.html">Upgrading to v0.11</a>
</li>

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website/upgrade-guides/0-12.html.markdown Normal file
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---
layout: "downloads"
page_title: "Upgrading to Terraform 0.12"
sidebar_current: "upgrade-guides-0-12"
description: |-
Upgrading to Terraform v0.12
---
# Upgrading to Terraform v0.12
~> Terraform 0.12 will not be released until later this summer. This guide is
proactive to help users understand what the upgrade path to 0.12 will be like.
This guide will be updated with more detail up until the release of 0.12.
[Terraform v0.12 will be a major release](https://hashicorp.com/blog/terraform-0-1-2-preview)
focused on configuration language improvements and thus will include some
changes that you'll need to consider when upgrading. The goal of this guide is
to cover the most common upgrade concerns and issues. For the majority of users,
no steps will need to be taken to upgrade. The sections below explain which
users are likely to be in the small group who will need to make manual changes
to upgrade to 0.12.
This guide focuses on changes from v0.11 to v0.12. Each previous major release
has its own upgrade guide, so please consult the other guides (available in the
navigation) if you are upgrading directly from an earlier version.
## Upgrading Terraform configuration
The majority of users will not need to make manual changes to their Terraform
configurations to upgrade to 0.12. The users who will need to make manual
changes are users who use language workarounds in previous Terraform versions.
Examples of these workarounds include:
- Treating block types like attributes in an attempt to work around Terraform
not supporting generating nested blocks dynamically.
Note that these workarounds are not "wrong", but rather clever solutions by
dedicated community members! These folks have been the inspiration for HCL2 and
their clever solutions have given guidance on how to make the Terraform language
more flexible to meet the needs of complex infrastructure.
For users who follow the examples in the Terraform documentation, there should
be no required changes. While no manual changes are needed, users can still run
the migration tool to convert to the more readable syntax supported in this
release. For those users, Terraform 0.12 will be released with a migration tool
to guide users through upgrading their configurations.
## Upgrading Terraform providers
We’ve updated the RPC protocol used by Terraform plugins to support typed data
and schema transfer.
In Terraform 0.12 Terraform will have an awareness of the schemas used by both
provider and provisioner plugins. This V1 for the RPC plugin protocols will
still use the old-style passing of map[string]interface{} for config and
map[string]string with flatmap for state/diff.
In order to ease the transition to the new version of terraform, backwards
compatible providers will be built allowing them to be used with previous
versions of terraform. Backwards compatibility through this mechanism is not a
long term strategy for maintaining providers in the event of further protocol
changes, and is only a stepping stone.
Having new providers be backwards compatible with older versions of Terraform
alleviates provider developers from the responsibility of maintaining a branch
for backports, allows any major version changes to be available to older
clients, and reduces the urgency for users to upgrade everything at once.
To upgrade a provider to use the new RPC plugin protocol in 0.12 and remain
backwards compatible with previous releases, providers will need to update their
Terraform dependencies to a 0.12 release. The changes to the helper packages are
being designed so that updating the packages will allow the provider to work
with the new plugin protocol, while remaining compatible with previous Terraform
releases.
## Upgrading modules
Module authors will need to complete several steps to get their modules 0.12
ready.
1. Follow the steps in "Upgrading Terraform configurations" to get the module
code upgraded
1. The migration tool will automatically add a >= 0.12.0 Terraform version pin.
No action is needed, just awareness.
1. Update provider version requirements if there are version pins in the module
1. If you are using the Terraform Registry, publish a new major version of the
module. If you are not using the registry, make sure downstream consumers of the
module are aware of the update.
Module consumers can then upgrade to the new versions of the module by upgrading
their configurations to 0.12 and updating the module version in that
configuration.
## Upgrading Sentinel policies
Terraform Enterprise users of Sentinel will need to complete the below steps to
upgrade Sentinel to work with Terraform 0.12.
1. Update Terraform configurations to 0.12
1. Update Sentinel policies
Because Sentinel is applied across all workspaces in Terraform Enterprise, all
workspaces must be upgraded to Terraform 0.12 otherwise Sentinel policies will
fail on versions below 0.12.