terraform-aws-rds-db-proxy

Terraform module to provision an Amazon RDS Proxy for MySQL or Postgres.

This project is part of our comprehensive "SweetOps" approach towards DevOps.

It's 100% Open Source and licensed under the APACHE2.

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Security & Compliance

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Benchmark	Description
	Infrastructure Security Compliance
	Center for Internet Security, KUBERNETES Compliance
	Center for Internet Security, AWS Compliance
	Center for Internet Security, AZURE Compliance
	Payment Card Industry Data Security Standards Compliance
	National Institute of Standards and Technology Compliance
	Information Security Management System, ISO/IEC 27001 Compliance
	Service Organization Control 2 Compliance
	Center for Internet Security, GCP Compliance
	Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

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 "vpc" {
  source  = "cloudposse/vpc/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  cidr_block = "172.16.0.0/16"

  context = module.this.context
}

module "subnets" {
  source  = "cloudposse/dynamic-subnets/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  availability_zones   = var.availability_zones
  vpc_id               = module.vpc.vpc_id
  igw_id               = module.vpc.igw_id
  cidr_block           = module.vpc.vpc_cidr_block
  nat_gateway_enabled  = false
  nat_instance_enabled = false

  context = module.this.context
}

resource "random_password" "admin_password" {
  count  = var.database_password == "" || var.database_password == null ? 1 : 0
  length           = 33
  special          = false
  override_special = "!#$%^&*()<>-_"
}

locals {
  database_password = var.database_password != "" && var.database_password != null ? var.database_password : join("", random_password.admin_password.*.result)

  username_password = {
    username = var.database_user
    password = local.database_password
  }

  auth = [
    {
      auth_scheme = "SECRETS"
      description = "Access the database instance using username and password from AWS Secrets Manager"
      iam_auth    = "DISABLED"
      secret_arn  = aws_secretsmanager_secret.rds_username_and_password.arn
    }
  ]
}

module "rds_instance" {
  source  = "cloudposse/rds/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  database_name       = var.database_name
  database_user       = var.database_user
  database_password   = local.database_password
  database_port       = var.database_port
  multi_az            = var.multi_az
  storage_type        = var.storage_type
  allocated_storage   = var.allocated_storage
  storage_encrypted   = var.storage_encrypted
  engine              = var.engine
  engine_version      = var.engine_version
  instance_class      = var.instance_class
  db_parameter_group  = var.db_parameter_group
  publicly_accessible = var.publicly_accessible
  vpc_id              = module.vpc.vpc_id
  subnet_ids          = module.subnets.private_subnet_ids
  security_group_ids  = [module.vpc.vpc_default_security_group_id]
  apply_immediately   = var.apply_immediately

  context = module.this.context
}

resource "aws_secretsmanager_secret" "rds_username_and_password" {
  name                    = module.this.id
  description             = "RDS username and password"
  recovery_window_in_days = 0
  tags                    = module.this.tags
}

resource "aws_secretsmanager_secret_version" "rds_username_and_password" {
  secret_id     = aws_secretsmanager_secret.rds_username_and_password.id
  secret_string = jsonencode(local.username_password)
}

module "rds_proxy" {
  source  = "cloudposse/rds-db-proxy/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  db_instance_identifier = module.rds_instance.instance_id
  auth                   = local.auth
  vpc_security_group_ids = [module.vpc.vpc_default_security_group_id]
  vpc_subnet_ids         = module.subnets.public_subnet_ids

  debug_logging                = var.debug_logging
  engine_family                = var.engine_family
  idle_client_timeout          = var.idle_client_timeout
  require_tls                  = var.require_tls
  connection_borrow_timeout    = var.connection_borrow_timeout
  init_query                   = var.init_query
  max_connections_percent      = var.max_connections_percent
  max_idle_connections_percent = var.max_idle_connections_percent
  session_pinning_filters      = var.session_pinning_filters
  existing_iam_role_arn        = var.existing_iam_role_arn

  context = module.this.context
}

Examples

Review the complete example to see how to use this module.

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	>= 0.13.0
aws	>= 3.1.15

Providers

Name	Version
aws	>= 3.1.15

Modules

Name	Source	Version
role_label	cloudposse/label/null	0.25.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_db_proxy.this	resource
aws_db_proxy_default_target_group.this	resource
aws_db_proxy_target.this	resource
aws_iam_policy.this	resource
aws_iam_role.this	resource
aws_iam_role_policy_attachment.this	resource
aws_iam_policy_document.assume_role	data source
aws_iam_policy_document.this	data source
aws_kms_key.this	data source
aws_region.this	data source

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
auth	Configuration blocks with authorization mechanisms to connect to the associated database instances or clusters	list(object({ auth_scheme = string description = string iam_auth = string secret_arn = string }))	n/a	yes
connection_borrow_timeout	The number of seconds for a proxy to wait for a connection to become available in the connection pool. Only applies when the proxy has opened its maximum number of connections and all connections are busy with client sessions	`number`	`120`	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
db_cluster_identifier	DB cluster identifier. Either `db_instance_identifier` or `db_cluster_identifier` should be specified and both should not be specified together	`string`	`null`	no
db_instance_identifier	DB instance identifier. Either `db_instance_identifier` or `db_cluster_identifier` should be specified and both should not be specified together	`string`	`null`	no
debug_logging	Whether the proxy includes detailed information about SQL statements in its logs	`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
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
engine_family	The kinds of databases that the proxy can connect to. This value determines which database network protocol the proxy recognizes when it interprets network traffic to and from the database. The engine family applies to MySQL and PostgreSQL for both RDS and Aurora. Valid values are MYSQL and POSTGRESQL	`string`	`"MYSQL"`	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
existing_iam_role_arn	The ARN of an existing IAM role that the proxy can use to access secrets in AWS Secrets Manager. If not provided, the module will create a role to access secrets in Secrets Manager	`string`	`null`	no
iam_role_attributes	Additional attributes to add to the ID of the IAM role that the proxy uses to access secrets in AWS Secrets Manager	`list(string)`	`null`	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
idle_client_timeout	The number of seconds that a connection to the proxy can be inactive before the proxy disconnects it	`number`	`1800`	no
init_query	One or more SQL statements for the proxy to run when opening each new database connection	`string`	`null`	no
kms_key_id	The ARN or Id of the AWS KMS customer master key (CMK) to encrypt the secret values in the versions stored in secrets. If you don't specify this value, then Secrets Manager defaults to using the AWS account's default CMK (the one named `aws/secretsmanager`)	`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
max_connections_percent	The maximum size of the connection pool for each target in a target group	`number`	`100`	no
max_idle_connections_percent	Controls how actively the proxy closes idle database connections in the connection pool. A high value enables the proxy to leave a high percentage of idle connections open. A low value causes the proxy to close idle client connections and return the underlying database connections to the connection pool	`number`	`50`	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
proxy_create_timeout	Proxy creation timeout	`string`	`"30m"`	no
proxy_delete_timeout	Proxy delete timeout	`string`	`"60m"`	no
proxy_update_timeout	Proxy update timeout	`string`	`"30m"`	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
require_tls	A Boolean parameter that specifies whether Transport Layer Security (TLS) encryption is required for connections to the proxy. By enabling this setting, you can enforce encrypted TLS connections to the proxy	`bool`	`false`	no
session_pinning_filters	Each item in the list represents a class of SQL operations that normally cause all later statements in a session using a proxy to be pinned to the same underlying database connection	`list(string)`	`null`	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	`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
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	`string`	`null`	no
vpc_security_group_ids	One or more VPC security group IDs to associate with the proxy	`set(string)`	n/a	yes
vpc_subnet_ids	One or more VPC subnet IDs to associate with the proxy	`set(string)`	n/a	yes

Outputs

Name	Description
proxy_arn	Proxy ARN
proxy_default_target_group_arn	The Amazon Resource Name (ARN) representing the default target group
proxy_default_target_group_name	The name of the default target group
proxy_endpoint	Proxy endpoint
proxy_iam_role_arn	The ARN of the IAM role that the proxy uses to access secrets in AWS Secrets Manager
proxy_id	Proxy ID
proxy_target_endpoint	Hostname for the target RDS DB Instance. Only returned for `RDS_INSTANCE` type
proxy_target_id	Identifier of `db_proxy_name`, `target_group_name`, `target type` (e.g. `RDS_INSTANCE` or `TRACKED_CLUSTER`), and resource identifier separated by forward slashes (`/`)
proxy_target_port	Port for the target RDS DB instance or Aurora DB cluster
proxy_target_rds_resource_id	Identifier representing the DB instance or DB cluster target
proxy_target_target_arn	Amazon Resource Name (ARN) for the DB instance or DB cluster
proxy_target_tracked_cluster_id	DB Cluster identifier for the DB instance target. Not returned unless manually importing an `RDS_INSTANCE` target that is part of a DB cluster
proxy_target_type	Type of target. e.g. `RDS_INSTANCE` or `TRACKED_CLUSTER`

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Related Projects

Check out these related projects.

terraform-aws-rds-cluster - Terraform module to provision an RDS Aurora cluster for MySQL or Postgres.
terraform-aws-rds - Terraform module to provision AWS RDS instances.
terraform-aws-rds-cloudwatch-sns-alarms - Terraform module that configures important RDS alerts using CloudWatch and sends them to an SNS topic.
terraform-aws-rds-replica - Terraform module to provision AWS RDS replica instances. These are best suited for reporting purposes.
terraform-aws-backup - Terraform module to provision AWS Backup, a fully managed backup service that makes it easy to centralize and automate the back up of data across AWS services such as Amazon EBS volumes, Amazon EC2 instances, Amazon RDS databases, Amazon DynamoDB tables, Amazon EFS file systems, and AWS Storage Gateway volumes.

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Copyright

License

See LICENSE for full details.

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
specific language governing permissions and limitations
under the License.

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All other trademarks referenced herein are the property of their respective owners.

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Contributors

Erik Osterman	Andriy Knysh	RB

Name		Name	Last commit message	Last commit date
Latest commit History 9 Commits
.github		.github
docs		docs
examples/complete		examples/complete
test		test
.editorconfig		.editorconfig
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README.yaml		README.yaml
context.tf		context.tf
iam.tf		iam.tf
main.tf		main.tf
outputs.tf		outputs.tf
variables.tf		variables.tf
versions.tf		versions.tf

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