AWS RDS Terraform module

Terraform module which creates RDS resources on AWS.

Root module calls these modules which can also be used separately to create independent resources:

• db_instance - creates RDS DB instance
• db_subnet_group - creates RDS DB subnet group
• db_parameter_group - creates RDS DB parameter group
• db_option_group - creates RDS DB option group

Usage

module "db" {
  source  = "terraform-aws-modules/rds/aws"

  identifier = "demodb"

  engine            = "mysql"
  engine_version    = "5.7.25"
  instance_class    = "db.t3a.large"
  allocated_storage = 5

  db_name  = "demodb"
  username = "user"
  port     = "3306"

  iam_database_authentication_enabled = true

  vpc_security_group_ids = ["sg-12345678"]

  maintenance_window = "Mon:00:00-Mon:03:00"
  backup_window      = "03:00-06:00"

  # Enhanced Monitoring - see example for details on how to create the role
  # by yourself, in case you don't want to create it automatically
  monitoring_interval = "30"
  monitoring_role_name = "MyRDSMonitoringRole"
  create_monitoring_role = true

  tags = {
    Owner       = "user"
    Environment = "dev"
  }

  # DB subnet group
  create_db_subnet_group = true
  subnet_ids             = ["subnet-12345678", "subnet-87654321"]

  # DB parameter group
  family = "mysql5.7"

  # DB option group
  major_engine_version = "5.7"

  # Database Deletion Protection
  deletion_protection = true

  parameters = [
    {
      name = "character_set_client"
      value = "utf8mb4"
    },
    {
      name = "character_set_server"
      value = "utf8mb4"
    }
  ]

  options = [
    {
      option_name = "MARIADB_AUDIT_PLUGIN"

      option_settings = [
        {
          name  = "SERVER_AUDIT_EVENTS"
          value = "CONNECT"
        },
        {
          name  = "SERVER_AUDIT_FILE_ROTATIONS"
          value = "37"
        },
      ]
    },
  ]
}

Conditional creation

The following values are provided to toggle on/off creation of the associated resources as desired:

module "db" {
  source = "terraform-aws-modules/rds/aws"

  # Disable creation of RDS instance(s)
  create_db_instance = false

  # Disable creation of option group - provide an option group or default AWS default
  create_db_option_group = false

  # Disable creation of parameter group - provide a parameter group or default to AWS default
  create_db_parameter_group = false

  # Enable creation of subnet group (disabled by default)
  create_db_subnet_group = true

  # Enable creation of monitoring IAM role
  create_monitoring_role = true

  # ... omitted
}

Option Groups

Reference

Users have the ability to:

• Create an option group with the name provided:

  option_group_name            = "prod-instance-mysql-8.0"
  option_group_use_name_prefix = false

• Create an option group using a unique prefix beginning with the name provided:

  option_group_name = "prod-instance-mysql-8.0"

• Pass the name of an option group to use that has been created outside of the module:

  create_db_option_group = false
  option_group_name      = "prod-instance-mysql-8.0" # must already exist in AWS

• Skip creating an option group for PostgreSQL entirely as that is not supported

  engine            = "postgres"
  option_group_name = "prod-instance-postgresql-11.0" # this will be ignored, no option group created

• Use a default option group provided by AWS

  create_db_option_group = false

Parameter Groups

Reference

Users have the ability to:

• Create a parameter group with the name provided:

  parameter_group_name            = "prod-instance-mysql-8.0"
  parameter_group_use_name_prefix = false

• Create a parameter group using a unique prefix beginning with the name provided:

  parameter_group_name = "prod-instance-mysql-8.0"

• Pass the name of a parameter group to use that has been created outside of the module:

  create_db_parameter_group = false
  parameter_group_name   = "prod-instance-mysql-8.0" # must already exist in AWS

• Use a default parameter group provided by AWS

  create_db_parameter_group = false

Examples

• Complete RDS example for MSSQL
• Complete RDS example for MySQL
• Complete RDS example for Oracle
• Complete RDS example for PostgreSQL
• Enhanced monitoring example
• Replica RDS example for MySQL
• Replica RDS example for PostgreSQL
• S3 import example for MySQL

Notes

1. This module does not create RDS security group. Use terraform-aws-security-group module for this.

Requirements

Name	Version
terraform	>= 0.13.1
aws	>= 4.0
random	>= 3.1

Providers

Name	Version
random	>= 3.1

Modules

Name	Source	Version
db_instance	./modules/db_instance	n/a
db_option_group	./modules/db_option_group	n/a
db_parameter_group	./modules/db_parameter_group	n/a
db_subnet_group	./modules/db_subnet_group	n/a

Resources

Name	Type
random_password.master_password	resource

Inputs

Name	Description	Type	Default	Required
allocated_storage	The allocated storage in gigabytes	string	null	no
allow_major_version_upgrade	Indicates that major version upgrades are allowed. Changing this parameter does not result in an outage and the change is asynchronously applied as soon as possible	bool	false	no
apply_immediately	Specifies whether any database modifications are applied immediately, or during the next maintenance window	bool	false	no
auto_minor_version_upgrade	Indicates that minor engine upgrades will be applied automatically to the DB instance during the maintenance window	bool	true	no
availability_zone	The Availability Zone of the RDS instance	string	null	no
backup_retention_period	The days to retain backups for	number	null	no
backup_window	The daily time range (in UTC) during which automated backups are created if they are enabled. Example: '09:46-10:16'. Must not overlap with maintenance_window	string	null	no
ca_cert_identifier	Specifies the identifier of the CA certificate for the DB instance	string	null	no
character_set_name	The character set name to use for DB encoding in Oracle instances. This can't be changed. See Oracle Character Sets Supported in Amazon RDS and Collations and Character Sets for Microsoft SQL Server for more information. This can only be set on creation	string	null	no
cloudwatch_log_group_kms_key_id	The ARN of the KMS Key to use when encrypting log data	string	null	no
cloudwatch_log_group_retention_in_days	The number of days to retain CloudWatch logs for the DB instance	number	7	no
copy_tags_to_snapshot	On delete, copy all Instance tags to the final snapshot	bool	false	no
create_cloudwatch_log_group	Determines whether a CloudWatch log group is created for each enabled_cloudwatch_logs_exports	bool	false	no
create_db_instance	Whether to create a database instance	bool	true	no
create_db_option_group	Create a database option group	bool	true	no
create_db_parameter_group	Whether to create a database parameter group	bool	true	no
create_db_subnet_group	Whether to create a database subnet group	bool	false	no
create_monitoring_role	Create IAM role with a defined name that permits RDS to send enhanced monitoring metrics to CloudWatch Logs	bool	false	no
create_random_password	Whether to create random password for RDS primary cluster	bool	true	no
db_instance_tags	Additional tags for the DB instance	map(string)	{}	no
db_name	The DB name to create. If omitted, no database is created initially	string	null	no
db_option_group_tags	Additional tags for the DB option group	map(string)	{}	no
db_parameter_group_tags	Additional tags for the DB parameter group	map(string)	{}	no
db_subnet_group_description	Description of the DB subnet group to create	string	null	no
db_subnet_group_name	Name of DB subnet group. DB instance will be created in the VPC associated with the DB subnet group. If unspecified, will be created in the default VPC	string	null	no
db_subnet_group_tags	Additional tags for the DB subnet group	map(string)	{}	no
db_subnet_group_use_name_prefix	Determines whether to use subnet_group_name as is or create a unique name beginning with the subnet_group_name as the prefix	bool	true	no
delete_automated_backups	Specifies whether to remove automated backups immediately after the DB instance is deleted	bool	true	no
deletion_protection	The database can't be deleted when this value is set to true	bool	false	no
domain	The ID of the Directory Service Active Directory domain to create the instance in	string	null	no
domain_iam_role_name	(Required if domain is provided) The name of the IAM role to be used when making API calls to the Directory Service	string	null	no
enabled_cloudwatch_logs_exports	List of log types to enable for exporting to CloudWatch logs. If omitted, no logs will be exported. Valid values (depending on engine): alert, audit, error, general, listener, slowquery, trace, postgresql (PostgreSQL), upgrade (PostgreSQL)	list(string)	[]	no
engine	The database engine to use	string	null	no
engine_version	The engine version to use	string	null	no
family	The family of the DB parameter group	string	null	no
final_snapshot_identifier_prefix	The name which is prefixed to the final snapshot on cluster destroy	string	"final"	no
iam_database_authentication_enabled	Specifies whether or not the mappings of AWS Identity and Access Management (IAM) accounts to database accounts are enabled	bool	false	no
identifier	The name of the RDS instance	string	n/a	yes
instance_class	The instance type of the RDS instance	string	null	no
iops	The amount of provisioned IOPS. Setting this implies a storage_type of 'io1'	number	0	no
kms_key_id	The ARN for the KMS encryption key. If creating an encrypted replica, set this to the destination KMS ARN. If storage_encrypted is set to true and kms_key_id is not specified the default KMS key created in your account will be used	string	null	no
license_model	License model information for this DB instance. Optional, but required for some DB engines, i.e. Oracle SE1	string	null	no
maintenance_window	The window to perform maintenance in. Syntax: 'ddd:hh24:mi-ddd:hh24:mi'. Eg: 'Mon:00:00-Mon:03:00'	string	null	no
major_engine_version	Specifies the major version of the engine that this option group should be associated with	string	null	no
max_allocated_storage	Specifies the value for Storage Autoscaling	number	0	no
monitoring_interval	The interval, in seconds, between points when Enhanced Monitoring metrics are collected for the DB instance. To disable collecting Enhanced Monitoring metrics, specify 0. The default is 0. Valid Values: 0, 1, 5, 10, 15, 30, 60	number	0	no
monitoring_role_arn	The ARN for the IAM role that permits RDS to send enhanced monitoring metrics to CloudWatch Logs. Must be specified if monitoring_interval is non-zero	string	null	no
monitoring_role_description	Description of the monitoring IAM role	string	null	no
monitoring_role_name	Name of the IAM role which will be created when create_monitoring_role is enabled	string	"rds-monitoring-role"	no
multi_az	Specifies if the RDS instance is multi-AZ	bool	false	no
option_group_description	The description of the option group	string	null	no
option_group_name	Name of the option group	string	null	no
option_group_timeouts	Define maximum timeout for deletion of aws_db_option_group resource	map(string)	{}	no
option_group_use_name_prefix	Determines whether to use option_group_name as is or create a unique name beginning with the option_group_name as the prefix	bool	true	no
options	A list of Options to apply	any	[]	no
parameter_group_description	Description of the DB parameter group to create	string	null	no
parameter_group_name	Name of the DB parameter group to associate or create	string	null	no
parameter_group_use_name_prefix	Determines whether to use parameter_group_name as is or create a unique name beginning with the parameter_group_name as the prefix	bool	true	no
parameters	A list of DB parameters (map) to apply	list(map(string))	[]	no
password	Password for the master DB user. Note that this may show up in logs, and it will be stored in the state file	string	null	no
performance_insights_enabled	Specifies whether Performance Insights are enabled	bool	false	no
performance_insights_kms_key_id	The ARN for the KMS key to encrypt Performance Insights data	string	null	no
performance_insights_retention_period	The amount of time in days to retain Performance Insights data. Either 7 (7 days) or 731 (2 years)	number	7	no
port	The port on which the DB accepts connections	string	null	no
publicly_accessible	Bool to control if instance is publicly accessible	bool	false	no
random_password_length	Length of random password to create	number	16	no
replica_mode	Specifies whether the replica is in either mounted or open-read-only mode. This attribute is only supported by Oracle instances. Oracle replicas operate in open-read-only mode unless otherwise specified	string	null	no
replicate_source_db	Specifies that this resource is a Replicate database, and to use this value as the source database. This correlates to the identifier of another Amazon RDS Database to replicate	string	null	no
restore_to_point_in_time	Restore to a point in time (MySQL is NOT supported)	map(string)	null	no
s3_import	Restore from a Percona Xtrabackup in S3 (only MySQL is supported)	map(string)	null	no
skip_final_snapshot	Determines whether a final DB snapshot is created before the DB instance is deleted. If true is specified, no DBSnapshot is created. If false is specified, a DB snapshot is created before the DB instance is deleted	bool	false	no
snapshot_identifier	Specifies whether or not to create this database from a snapshot. This correlates to the snapshot ID you'd find in the RDS console, e.g: rds:production-2015-06-26-06-05	string	null	no
storage_encrypted	Specifies whether the DB instance is encrypted	bool	true	no
storage_type	One of 'standard' (magnetic), 'gp2' (general purpose SSD), or 'io1' (provisioned IOPS SSD). The default is 'io1' if iops is specified, 'gp2' if not	string	null	no
subnet_ids	A list of VPC subnet IDs	list(string)	[]	no
tags	A mapping of tags to assign to all resources	map(string)	{}	no
timeouts	Updated Terraform resource management timeouts. Applies to aws_db_instance in particular to permit resource management times	map(string)	{}	no
timezone	Time zone of the DB instance. timezone is currently only supported by Microsoft SQL Server. The timezone can only be set on creation. See MSSQL User Guide for more information	string	null	no
username	Username for the master DB user	string	null	no
vpc_security_group_ids	List of VPC security groups to associate	list(string)	[]	no

Outputs

Name	Description
db_instance_address	The address of the RDS instance
db_instance_arn	The ARN of the RDS instance
db_instance_availability_zone	The availability zone of the RDS instance
db_instance_ca_cert_identifier	Specifies the identifier of the CA certificate for the DB instance
db_instance_cloudwatch_log_groups	Map of CloudWatch log groups created and their attributes
db_instance_domain	The ID of the Directory Service Active Directory domain the instance is joined to
db_instance_domain_iam_role_name	The name of the IAM role to be used when making API calls to the Directory Service.
db_instance_endpoint	The connection endpoint
db_instance_hosted_zone_id	The canonical hosted zone ID of the DB instance (to be used in a Route 53 Alias record)
db_instance_id	The RDS instance ID
db_instance_name	The database name
db_instance_password	The database password (this password may be old, because Terraform doesn't track it after initial creation)
db_instance_port	The database port
db_instance_resource_id	The RDS Resource ID of this instance
db_instance_status	The RDS instance status
db_instance_username	The master username for the database
db_option_group_arn	The ARN of the db option group
db_option_group_id	The db option group id
db_parameter_group_arn	The ARN of the db parameter group
db_parameter_group_id	The db parameter group id
db_subnet_group_arn	The ARN of the db subnet group
db_subnet_group_id	The db subnet group name
enhanced_monitoring_iam_role_arn	The Amazon Resource Name (ARN) specifying the monitoring role
enhanced_monitoring_iam_role_name	The name of the monitoring role

Authors

Module is maintained by Anton Babenko with help from these awesome contributors.

License

Apache 2 Licensed. See LICENSE for full details.