Part of the upgrade process happens in the first "terraform apply" after
adding explicit source addresses in the configuration. Previously we just
left that implied under the assumption that everyone would run
"terraform apply" shortly after anyway, but there is a specific tricky
situation where the first change after upgrading is to remove a resource
from the configuration, leaving Terraform unable to complete the upgrade.
Because of that, we'll now explicitly direct users to run
"terraform apply" after upgrading. Along with that, there's a reminder to
make sure that "terraform plan" indicates no changes before upgrading, so
that completing the upgrade doesn't involve also applying changes to
remote objects.
This document now lives at:
- https://learn.hashicorp.com/terraform/development/running-terraform-in-automation
...and terraform.io has been redirecting to there for quite a while. This commit
removes the extra copy so that the text of the two versions doesn't drift, and
updates existing links to point to the new location.
There are a few situations that we've seen arise quite commonly for folks
upgrading from Terraform 0.11 to 0.12. These particular problems are not
things that Terraform 0.12 can fix automatically during upgrading, but
we can at least give some better feedback to users that they ought to be
addressed _before_ upgrading.
The provider address problem is already detected and flagged by the
"terraform 0.11checklist" command that folks should run as part of their
upgrade process, but the module address problem is not something we
noticed was lacking validation in 0.11 and so the checklist tool doesn't
cover it. Due to the lack of coverage in the checklist tool, this commit
also includes an additional section in the upgrade guide that mentions
the problem and gives instructions on how to address it.
The Terraform Enterprise brand has now been split into two parts:
- Terraform Cloud is the application that helps teams use Terraform together,
with remote state storage, a shared run environment, etc.
- Terraform Enterprise is the on-premise distribution that lets enterprises run
a private instance of the Terraform Cloud application.
The former TFE docs have been split accordingly.
A longer-form guide will follow in the Sentinel section of the Terraform
Enterprise documentation, once it's ready. For now, this section isn't
saying anything useful since it was always just a stub for a guide we
planned to write later.
The upgrade tool is assuming that a type of "list" means list(string) and
a type of "map" means map(string), because that was what we documented
those as meaning.
In practice, Terraform 0.11 was lacking some validation which allowed
more complex nested structures in some cases even though they were pretty
inconvenient to use due to other language limitations.
The upgrade tool doesn't have enough context to make a reliable decision
on this, so instead we'll rely on the upgrade guide for this. We don't
need a TF-UPGRADE-TODO comment in this case because we reserve those for
things where a subsequent operation might cause the configuration to be
misinterpred, rather than just causing an error. Instead, we'll show an
example of the comment in the upgrade guide so the reader can easily
match it, and give some advice in the guide on how to address it.
Our original upgrade guide was drafted while some things were still in
flux and not all of our upgrade tooling was in place yet.
This redraft now attempts to be more specific and direct, showing exact
commands to run and (where relevant) exact error messages that Terraform
might return.
I also took this opportunity for some general copy-editing, though we'll
probably want to do one more pass of that alone (without changing any
content at the same time) before final release.
This new content presumes the existence of a Terraform v0.11.14 release,
which isn't published yet at the time of writing but should be published
before v0.12.0 final, once we've done final verification and review of
the upgrade path including it.
The division operator now always performs floating point division, whereas
before it would choose between float and int division based on the types
of its arguments.
We have a specific error message for when a fractional number is used as
an index in HCL, but this additional upgrade guidance provides a specific
solution to the problem: the floor function.
Sadly we don't have enough context in the current design of the upgrade
tool to make this fix automatic. With some refactoring it may be possible
to apply the fix automatically within list brackets, but since that is
a relatively complex change we'll first try this manual solution prompted
by an error message, because in practice so far we've seen this reported
only in the context of list indexing and our error check will catch that
and make the user aware of the need for a fix there.
As part of this, I'm copying the entire text of the 0.12
docs/configuration/modules.html page into docs/configuration-0-11/modules.html —
some of the 0.11 pages needed to be able to link to the moved content, I
didn't want to jump versions jarringly, and a close reading didn't reveal
anything in there that's inaccurate for 0.11.
* docs: update plan command documentation. Fixes#19235
* docs: added a missing reserved variable name. Fixes#19159.
* website: add note that resource names cannot start with a number
* website: add some notes to the 0.12 upgrade guide
The announcement post contains the information about the temporary
situation where not all of the providers are compatible yet. Linking there
rather than duplicating the information in the upgrade guide means we'll
be able to update in one place as the situation changes.
The upgrade guide had its last major upgrade while we were preparing for
the alpha releases. Now that the upgrade tool is more complete we can
describe the required changes in terms of that tool, and also add
additional information about provider upgrades.
We will revise this at least one more time before v0.12.0 final, but this
is an interim copy of the upgrade guide intended to help those who are
testing the beta releases.
Based on some feedback on the initial draft, make some minor updates to
how information is presented in the preview upgrade guide for v0.12.
This also includes some minor copy-editing work to try to make the "voice"
more consistent between different sections of the guide.
Following the examples as they were previously would cause errors
accessing demo.consul.io. Now we consistently set the scheme to https for
all examples that use demo.consul.io.
This also includes some other updates to the URLs, since the Consul demo
has been rebuilt with a different based configuration, and some general
formatting and copyediting changes in the Consul example.
This is a genre of invalid output expression that we've seen quite
commonly while testing with 0.11.0-rc1, so we'll call it out specifically
in the upgrade guide and suggest how to fix it.
We are recommending that as of 0.11 all provider configurations be placed
in the root module and, where necessary, be explicitly passed down via
a providers map to customize which configurations are seen by each
child module.
This new section attempts to guide users through such refactoring in the
common case where a child module defines its own provider configuration
based on a value passed in an input variable, and then uses that as
some context to link to the more detailed docs to help those who have
more complex configurations.
This changed close to the release of beta1 to use underscores as the
separator and to use a lower-case "v" to avoid any issues on
case-insensitive filesystems.
Martin Atkins