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Terraform-hardened

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Avoid common Terraform mistakes — state corruption, count vs for_each, lifecycle traps, and dependency ordering.

skills/terraform-hardened/SKILL.md

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## State Management
- Local state gets corrupted/lost — use remote backend (S3, GCS, Terraform Cloud)
- Multiple people running simultaneously — enable state locking with DynamoDB or equivalent
- Never edit state manually — use `terraform state mv`, `rm`, `import`
- State contains secrets in plain text — encrypt at rest, restrict access

## Count vs for_each
- `count` uses index — removing item 0 shifts all indices, forces recreation
- `for_each` uses keys — stable, removing one doesn't affect others
- Can't use both on same resource — choose one
- `for_each` requires set or map — `toset()` to convert list

## Lifecycle Rules
- `prevent_destroy = true` — blocks accidental deletion, must be removed to destroy
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