/terraform-aws-dynamodb

Terraform module that implements AWS DynamoDB with support for AutoScaling

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Terraform module to provision a DynamoDB table with autoscaling.

Autoscaler scales up/down the provisioned OPS for the DynamoDB table based on the load.

Requirements

This module requires AWS Provider >= 4.22.0

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Usage

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

module "dynamodb_table" {
  source = "cloudposse/dynamodb/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace                    = "eg"
  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_write_capacity = 5
  autoscale_max_write_capacity = 20
  enable_autoscaler            = true
}

Advanced Usage

With additional attributes, global secondary indexes and non_key_attributes (see examples/complete).

module "dynamodb_table" {
  source = "cloudposse/dynamodb/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace                    = "eg"
  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_write_capacity = 5
  autoscale_max_write_capacity = 20
  enable_autoscaler            = true

  dynamodb_attributes = [
    {
      name = "DailyAverage"
      type = "N"
    },
    {
      name = "HighWater"
      type = "N"
    },
    {
      name = "Timestamp"
      type = "S"
    }
  ]

  local_secondary_index_map = [
    {
      name               = "TimestampSortIndex"
      range_key          = "Timestamp"
      projection_type    = "INCLUDE"
      non_key_attributes = ["HashKey", "RangeKey"]
    },
    {
      name               = "HighWaterIndex"
      range_key          = "Timestamp"
      projection_type    = "INCLUDE"
      non_key_attributes = ["HashKey", "RangeKey"]
    }
  ]

  global_secondary_index_map = [
    {
      name               = "DailyAverageIndex"
      hash_key           = "DailyAverage"
      range_key          = "HighWater"
      write_capacity     = 5
      read_capacity      = 5
      projection_type    = "INCLUDE"
      non_key_attributes = ["HashKey", "RangeKey"]
    }
  ]

  replicas = ["us-east-1"]
}

NOTE: Variables "global_secondary_index_map" and "local_secondary_index_map" have a predefined schema, but in some cases not all fields are required or needed.

For example:

  • non_key_attributes can't be specified for Global Secondary Indexes (GSIs) when projection_type is ALL
  • read_capacity and write_capacity are not required for GSIs

In these cases, set the fields to null and Terraform will treat them as if they were not provided at all, but will not complain about missing values:

  global_secondary_index_map = [
    {
      write_capacity     = null
      read_capacity      = null
      projection_type    = "ALL"
      non_key_attributes = null
    }
  ]

See Terraform types and values for more details.

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name Version
terraform >= 1.0.0
aws >= 4.59
null >= 2.0

Providers

Name Version
aws >= 4.59
null >= 2.0

Modules

Name Source Version
dynamodb_autoscaler cloudposse/dynamodb-autoscaler/aws 0.16.0
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_dynamodb_table.default resource
null_resource.global_secondary_index_names resource
null_resource.local_secondary_index_names resource

Inputs

Name Description Type Default Required
additional_tag_map Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.		 map(string) {} no
attributes ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.		 list(string) [] no
autoscale_max_read_capacity DynamoDB autoscaling max read capacity number 20 no
autoscale_max_write_capacity DynamoDB autoscaling max write capacity number 20 no
autoscale_min_read_capacity DynamoDB autoscaling min read capacity number 5 no
autoscale_min_write_capacity DynamoDB autoscaling min write capacity number 5 no
autoscale_read_target The target value (in %) for DynamoDB read autoscaling number 50 no
autoscale_write_target The target value (in %) for DynamoDB write autoscaling number 50 no
autoscaler_attributes Additional attributes for the autoscaler module list(string) [] no
autoscaler_tags Additional resource tags for the autoscaler module map(string) {} no
billing_mode DynamoDB Billing mode. Can be PROVISIONED or PAY_PER_REQUEST string "PROVISIONED" no
context Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.		 any 
{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
}
 no
deletion_protection_enabled Enable/disable DynamoDB table deletion protection bool false no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.		 string null no
descriptor_formats Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
{<br/> format = string<br/> labels = list(string)<br/>}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).		 any {} no
dynamodb_attributes Additional DynamoDB attributes in the form of a list of mapped values 
list(object({
    name = string
    type = string
  }))
 [] no
enable_autoscaler Flag to enable/disable DynamoDB autoscaling bool false no
enable_encryption Enable DynamoDB server-side encryption bool true no
enable_point_in_time_recovery Enable DynamoDB point in time recovery bool true no
enable_streams Enable DynamoDB streams bool false no
enabled Set to false to prevent the module from creating any resources bool null no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
global_secondary_index_map Additional global secondary indexes in the form of a list of mapped values 
list(object({
    hash_key           = string
    name               = string
    non_key_attributes = list(string)
    projection_type    = string
    range_key          = string
    read_capacity      = number
    write_capacity     = number
  }))
 [] no
hash_key DynamoDB table Hash Key string n/a yes
hash_key_type Hash Key type, which must be a scalar type: S, N, or B for (S)tring, (N)umber or (B)inary data string "S" no
id_length_limit Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.		 number null no
import_table Import Amazon S3 data into a new table. 
object({
    # Valid values are GZIP, ZSTD and NONE
    input_compression_type = optional(string, null)
    # Valid values are CSV, DYNAMODB_JSON, and ION.
    input_format = string
    input_format_options = optional(object({
      csv = object({
        delimiter   = string
        header_list = list(string)
      })
    }), null)
    s3_bucket_source = object({
      bucket       = string
      bucket_owner = optional(string)
      key_prefix   = optional(string)
    })
  })
 null no
label_key_case Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.		 string null no
label_order The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.		 list(string) null no
label_value_case Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.		 string null no
labels_as_tags Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.		 set(string) 
[
  "default"
]
 no
local_secondary_index_map Additional local secondary indexes in the form of a list of mapped values 
list(object({
    name               = string
    non_key_attributes = list(string)
    projection_type    = string
    range_key          = string
  }))
 [] no
name ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.		 string null no
namespace ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique string null no
range_key DynamoDB table Range Key string "" no
range_key_type Range Key type, which must be a scalar type: S, N, or B for (S)tring, (N)umber or (B)inary data string "S" no
regex_replace_chars Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.		 string null no
replicas List of regions to create replica list(string) [] no
server_side_encryption_kms_key_arn The ARN of the CMK that should be used for the AWS KMS encryption. This attribute should only be specified if the key is different from the default DynamoDB CMK, alias/aws/dynamodb. string null no
stage ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' string null no
stream_view_type When an item in the table is modified, what information is written to the stream string "" no
table_class DynamoDB storage class of the table. Can be STANDARD or STANDARD_INFREQUENT_ACCESS string "STANDARD" no
table_name Table name. If provided, the bucket will be created with this name instead of generating the name from the context string null no
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.		 map(string) {} no
tags_enabled Set to false to disable tagging. This can be helpful if you're managing tables on dynamodb-local with terraform as it doesn't support tagging. bool true no
tenant ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for string null no
ttl_attribute DynamoDB table TTL attribute string "Expires" no
ttl_enabled Set to false to disable DynamoDB table TTL bool true no

Outputs

Name Description
global_secondary_index_names DynamoDB secondary index names
local_secondary_index_names DynamoDB local index names
table_arn DynamoDB table ARN
table_id DynamoDB table ID
table_name DynamoDB table name
table_stream_arn DynamoDB table stream ARN
table_stream_label DynamoDB table stream label

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License

License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
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