terragrunt

Terraform DynamoDB Module Base Terragrunt Example

A simple Terragrunt implementation using the Terraform DynamoDB module

The base example has autoscaling enabled but does not add any additional DynamoDB attributes, local secondary index maps or global secondary index maps.

Configuration

The Terragrunt implmentation uses a Terraform local backend which stores state on the local filesystem. This is configured in the terraform.tf file. To use the default "s3" backend you can set the backend to "s3" in this file. You will need to use terragrunt plan --terragrunt-source-update to force a change to the backend'

Providers are configured in the providers.tf file, which sets approriate versions to meet the module requirements.

Toggles are set in the toogles.auto.tfvars file. This file enables toggling the whole module, DynamoDB resources and Autoscaling resources.

The module configuration used in terraform.tfvars

namespace                    = "lic"
stage                        = "dev"
name                         = "cluster"
hash_key                     = "HashKey"
range_key                    = "RangeKey"
autoscale_write_target       = 50
autoscale_read_target        = 50
autoscale_min_read_capacity  = 5
autoscale_max_read_capacity  = 20
autoscale_min_read_capacity  = 5
autoscale_max_write_capacity = 20

Running The Example

Check out this module and switch to this directory.

Ensure the depedencies are installed

terragrunt init

Run a plan

terragrunt plan

Apply the plan

terragrunt apply

Destroy the resources

terragrunt destroy