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Remove outdated Terraform migration docs 

* Terraform v0.12.x and v0.13.x are now quite outdated,
remove the migration docs
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Dalton Hubble 2021-07-19 08:36:59 -07:00
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docs/topics/maintenance.md
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@ -197,7 +197,7 @@ Typhoon modules have been updated for v0.13.x. Poseidon publishes [providers](/t
| Typhoon Release | Terraform version |
|-------------------|---------------------|
| v1.21.3 - ? | v0.13.x, v0.14.4+, v0.15.x, v1.0.x |
| v1.21.2 - ? | v0.13.x, v0.14.4+, v0.15.x, v1.0.x |
| v1.21.1 - v1.21.1 | v0.13.x, v0.14.4+, v0.15.x |
| v1.20.2 - v1.21.0 | v0.13.x, v0.14.4+ |
| v1.20.0 - v1.20.2 | v0.13.x |
@ -208,76 +208,3 @@ Typhoon modules have been updated for v0.13.x. Poseidon publishes [providers](/t
| v1.7.3 - v1.9.1 | v0.10.x |
| v1.6.4 - v1.7.2 | v0.9.x |
### New Workspace
With a new Terraform workspace, use Terraform v0.15.x and the updated Typhoon [tutorials](/fedora-coreos/aws/#provider).
### Existing Workspace
An existing Terraform workspace may already manage earlier Typhoon clusters created with Terraform v0.12.x.
First, upgrade `terraform-provider-ct` to v0.6.1 following the [guide](#upgrade-terraform-provider-ct) above. As usual, read about how `apply` affects existing cluster nodes when `ct` is upgraded. But `terraform-provider-ct` v0.6.1 is compatible with both Terraform v0.12 and v0.13, so do this first.
```tf
provider "ct" {
version = "0.6.1"
}
```
Next, create Typhoon clusters using the `ref` that introduced Terraform v0.13 forward compatibility (`v1.18.8`) or later. You will see a compatibility warning. Use blue/green cluster replacement to shift to these new clusters, then eliminate older clusters.
```
module "nemo" {
source = "git::https://github.com/poseidon/typhoon//digital-ocean/fedora-coreos/kubernetes?ref=v1.18.8"
...
}
```
Install Terraform v0.13. Once all clusters in a workspace are on `v1.18.8` or above, you are ready to start using Terraform v0.13.
```
terraform version
v0.13.0
```
Update `providers.tf` to match the Typhoon [tutorials](/fedora-coreos/aws/#provider) and use new `required_providers` block.
```
terraform init
terraform 0.13upgrade # sometimes helpful
```
!!! note
You will see `Could not retrieve the list of available versions for provider -/ct: provider`
In state files, existing clusters use Terraform v0.12 providers (e.g. `-/aws`). Pivot to Terraform v0.13 providers (e.g. `hashicorp/aws`) with the following commands, as applicable. Repeat until `terraform init` no longer shows old-style providers.
```
terraform state replace-provider -- -/aws hashicorp/aws
terraform state replace-provider -- -/azurerm hashicorp/azurerm
terraform state replace-provider -- -/google hashicorp/google
terraform state replace-provider -- -/digitalocean digitalocean/digitalocean
terraform state replace-provider -- -/ct poseidon/ct
terraform state replace-provider -- -/matchbox poseidon/matchbox
terraform state replace-provider -- -/local hashicorp/local
terraform state replace-provider -- -/null hashicorp/null
terraform state replace-provider -- -/random hashicorp/random
terraform state replace-provider -- -/template hashicorp/template
terraform state replace-provider -- -/tls hashicorp/tls
```
Finally, verify Terraform v0.13 plan shows no diff.
```
terraform plan
No changes. Infrastructure is up-to-date.
```
### v0.12.x
Terraform [v0.12](https://www.hashicorp.com/blog/announcing-terraform-0-12) introduced major changes to the provider plugin protocol and HCL language (first-class expressions, formal list and map types, nullable variables, variable constraints, and short-circuiting ternary operators).
Typhoon modules have been adapted for Terraform v0.12. Provider plugins requirements now enforce v0.12 compatibility. However, some HCL language changes were breaking (list [type hint](https://www.terraform.io/upgrade-guides/0-12.html#referring-to-list-variables) workarounds in v0.11 now have new meaning). Typhoon cannot offer both v0.11 and v0.12 compatibility in the same release. Upcoming releases require upgrading Terraform to v0.12.