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AWSStatic-verified

DocumentDB Cluster, Encrypted and Auditable

A cluster whose two dangerous AWS defaults are inverted: storage encryption is hard-coded on because it cannot be added later, and the master password is never an input - Secrets Manager generates it, so it never reaches the state file.

terraformAWSaws
aws-documentdbvizier v1.2.0

Verification

Static-verified

Passed: validated and lint-clean (provider-schema-validated for AWS/Azure/GCP; Terraform-language lint elsewhere).

Conformance

  • Static validation (fmt · validate · tflint)
  • Security scan pending (Checkov)
  • Plan tests (mocked: validation rules · outputs)

Provenance

  • SHA-256 checksum
  • Signature (pending)

Functional

  • Live test pending (no cloud run yet)

Last verified 2026-09-12 · how we verify

Use it from the registry

terraform · opentofu
module "documentdb" {
  source  = "www.iac-bazaar.com/iac-bazaar/aws-documentdb/aws"
  version = "1.0.0"
}

Needs a registry token from /account/tokens. The module itself is free; the account is what identifies you. Full setup: registry docs.

Inputs & outputs

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Documentation

aws-documentdb

An Amazon DocumentDB cluster, its instances, subnet group and parameter group. Works with Terraform and OpenTofu (>= 1.6), AWS provider >= 6.0, < 7.0.

Two AWS defaults are wrong here, and this module inverts both.

  • storage_encrypted defaults to false. A cluster written the obvious way is unencrypted at rest, and it cannot be encrypted afterwards - the only route is a snapshot restored into a new cluster, with the downtime that implies. This module hard-codes it on; it is not a variable
  • skip_final_snapshot is how a destroy takes the data with it. It defaults off here, and a precondition refuses the one combination that leaves nothing behind: skip_final_snapshot on and deletion_protection off

The master password is not an input. manage_master_user_password hands it to Secrets Manager, which generates and rotates it. A password variable, however carefully marked sensitive, is written into the state file in plain text, and the state file is copied to wherever your backend lives. The secret's ARN is an output.

Other defaults worth knowing:

  • audit_logs on. Off, the question "what did that credential touch?" has no answer at all
  • Two instances, with promotion_tier set from the index so a failover is predictable rather than whichever replica answers first
  • A precondition requires two or more subnets: a single-AZ cluster cannot fail over, and nothing in the AWS API says so at apply time
  • master_username is validated against admin and root, which DocumentDB reserves and rejects late
  • allow_major_version_upgrade off: a major engine change is a migration, not a plan

Verification

Static validation runs tofu fmt, init, validate, tflint and checkov. This module has not yet had a live test, so it is published as statically validated with its live test pending and does not carry the live-tested mark.

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