backend.tf began with a stray YAML `---` doc separator (invalid HCL) that broke
`tofu` parsing. Remove it. Also document the one-time `unencrypted` fallback method
needed to adopt encryption on pre-existing plaintext state (add for the migrate,
remove after), so the record is complete. State migration to R2 verified: 4/4
resources read back through the encrypt-only method (proves ciphertext at rest).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Local-only tfstate meant losing the workstation would strand a rebuild (apply
would try to recreate the 3 live nodes). Move state to Cloudflare R2, which sits
OUTSIDE the Proxmox->VM->cluster->Gitea chain, so a full cluster rebuild can still
read it; encrypted at rest via OpenTofu native AES-GCM.
Adds a partial s3 backend (R2 skip-flags), gitignored backend.hcl/.r2.env for the
account-specific + secret bits, their .example templates, and a migration+DR runbook.
Locking (use_lockfile) deferred to an OpenTofu >=1.10 bump (1.9.0 lacks it).
Migration (tofu init -migrate-state) runs once the operator provisions the R2 bucket.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
jakman85andClaude Opus 4.8