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website: v0.13 upgrade guide about "terraform apply" during upgrading 

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 commit is contained in:
Martin Atkins 2020-07-13 10:31:22 -07:00
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@ -39,12 +39,25 @@ may be able to reproduce it and offer advice.
Upgrade guide sections:
* [Before You Upgrade](#before-you-upgrade)
* [Explicit Provider Source Locations](#explicit-provider-source-locations)
* [New Filesystem Layout for Local Copies of Providers](#new-filesystem-layout-for-local-copies-of-providers)
* [Special considerations for in-house providers](#in-house-providers)
* [Destroy-time provisioners may not refer to other resources](#destroy-time-provisioners-may-not-refer-to-other-resources)
* [Data resource reads can no longer be disabled by `-refresh=false`](#data-resource-reads-can-no-longer-be-disabled-by--refresh-false)
## Before You Upgrade
When upgrading between major releases, we always recommend ensuring that you
can run `terraform plan` and see no proposed changes on the previous version
first, because otherwise pending changes can add additional unknowns into the
upgrade process.
For this upgrade in particular, completing the upgrade will require running
`terraform apply` with Terraform 0.13 after upgrading in order to apply some
upgrades to the Terraform state, and we recommend doing that with no other
changes pending.
## Explicit Provider Source Locations
Prior versions of Terraform have supported automatic provider installation only
@ -137,6 +150,48 @@ run `terraform init` again to re-run the provider installer.
-> **Action:** Either run [`terraform 0.13upgrade`](/docs/commands/0.13upgrade.html) for each of your modules, or manually update the provider declarations to use explicit source addresses.
The upgrade tool described above only updates references in your configuration.
The Terraform state also includes references to provider configurations which
need to be updated to refer to the correct providers.
Terraform will automatically update provider configuration references in the
state the first time you run `terraform apply` after upgrading, but it relies
on information in the configuration to understand which provider any
existing resource belongs to, and so you must run `terraform apply` at least
once (and accept any changes it proposes) before removing any `resource` blocks
from your configuration after upgrading.
If you are using Terraform Cloud or Terraform Enterprise with the VCS-driven
workflow (as oposed to CLI-driven runs), refer to
[The UI- and VCS-driven Run Workflow](/docs/cloud/run/ui.html) to learn how
to manually start a run after you select a Terraform v0.13 release for your
workspace.
If you remove a `resource` block (or a `module` block for a module that
contains `resource` blocks) before the first `terraform apply`, you may see
a message like this reflecting that Terraform cannot determine which provider
configuration the existing object ought to be managed by:
```
Error: Provider configuration not present
To work with null_resource.foo its original provider configuration at
provider["registry.terraform.io/-/aws"] is required, but it has been removed.
This occurs when a provider configuration is removed while objects created by
that provider still exist in the state. Re-add the provider configuration to
destroy aws_instance.example, after which you can remove the provider
configuration again.
```
In this specific upgrade situation the problem is actually the missing
`resource` block rather than the missing `provider` block: Terraform would
normally refer to the configuration to see if this resource has an explicit
`provider` argument that would override the default strategy for selecting
a provider. If you see the above after upgrading, re-add the resource mentioned
in the error message until you've completed the upgrade.
-> **Action:** After updating all modules in your configuration to use the new provider requirements syntax, run `terraform apply` to create a new state snapshot containing the new-style provider source addresses that are now specified in your configuration.
## New Filesystem Layout for Local Copies of Providers
As part of introducing the hierarchical provider namespace discussed in the