A DynamoDB Cache Encrypted From the Start
DynamoDB Accelerator with TLS and encryption at rest. DAX leaves both off by default, and neither can be turned on for an existing cluster, so a fix means a new cluster. This module also creates its own security group (DAX otherwise uses the VPC default), a service role limited to the named tables and their indexes, and states that writes bypassing DAX leave stale reads until the TTL.
Verification
Static-verifiedPassed: validated and lint-clean (provider-schema-validated for AWS/Azure/GCP; Terraform-language lint elsewhere).
Conformance
- Static validation (fmt · validate · tflint)
- Security scan clean (Checkov)
- Plan tests (mocked: validation rules · outputs)
Provenance
- SHA-256 checksum
- Signature (pending)
Functional
- Live test pending (no cloud run yet)
Last verified 2026-09-16 · how we verify
Use it from the registry
terraform · opentofumodule "dax_cache" {
source = "www.iac-bazaar.com/iac-bazaar/aws-dax-cache/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-dax-cache
DynamoDB Accelerator (DAX). Works with Terraform and OpenTofu (>= 1.6), aws
provider >= 6.0, < 7.0.
Both encryption settings are off unless you choose them, and cannot be changed later. A DAX cluster's endpoint is unencrypted and its data at rest is unencrypted by default. AWS cannot turn on either for an existing cluster: the fix is a new cluster and moving the traffic. This module creates every cluster with TLS and encryption at rest. Clients need a recent DAX client, and a TLS cluster refuses plaintext connections.
Not the VPC's default security group. Without a security group DAX uses the VPC's default one. This module creates its own and opens only the cluster's port, to the networks and security groups you name.
The service role reaches only your tables. DAX calls DynamoDB with its own
role; this one is limited to the tables in table_arns and their indexes, and
allow_writes = false makes it a read-only cache.
A cache serves stale reads. Items and query results stay cached for 5
minutes by default (record_ttl_seconds, query_ttl_seconds), including after
something writes to the table without going through DAX.
Some changes replace the cluster: name, node_type and subnet_ids.
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.
Usage code & full reference need an account
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- Usage
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