mwaghadhare / rds

rds module

Terraform module to provision AWS RDS instances

---

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

Introduction

The module will create:

• DB instance (MySQL, Postgres, SQL Server, Oracle)
• DB Option Group (will create a new one or you may use an existing)
• DB Parameter Group
• DB Subnet Group
• DB Security Group
• DNS Record in Route53 for the DB endpoint

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.

module "rds_instance" {
    source = "../rds"
    namespace                   = "eg"
    stage                       = "prod"
    name                        = "app"
    dns_zone_id                 = "Z89FN1IW975KPE"
    host_name                   = "db"
    security_group_ids          = ["sg-xxxxxxxx"]
    ca_cert_identifier          = "rds-ca-2019"
    allowed_cidr_blocks         = ["XXX.XXX.XXX.XXX/32"]
    database_name               = "wordpress"
    database_user               = "admin"
    database_password           = "xxxxxxxxxxxx"
    database_port               = 3306
    multi_az                    = true
    storage_type                = "gp2"
    allocated_storage           = 100
    storage_encrypted           = true
    engine                      = "mysql"
    engine_version              = "5.7.17"
    major_engine_version        = "5.7"
    instance_class              = "db.t2.medium"
    db_parameter_group          = "mysql5.7"
    option_group_name           = "mysql-options"
    publicly_accessible         = false
    subnet_ids                  = ["sb-xxxxxxxxx", "sb-xxxxxxxxx"]
    vpc_id                      = "vpc-xxxxxxxx"
    snapshot_identifier         = "rds:production-2015-06-26-06-05"
    auto_minor_version_upgrade  = true
    allow_major_version_upgrade = false
    apply_immediately           = false
    maintenance_window          = "Mon:03:00-Mon:04:00"
    skip_final_snapshot         = false
    copy_tags_to_snapshot       = true
    backup_retention_period     = 7
    backup_window               = "22:00-03:00"

    db_parameter = [
      { name  = "myisam_sort_buffer_size"   value = "1048576" },
      { name  = "sort_buffer_size"          value = "2097152" }
    ]

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

Character Sets

If you wish to create the database in a specific character set you can use one of the following options depending on your database engine of choice.

For Oracle and Microsoft SQL you can specify charset name as an input variable to this module. For example, for Microsoft SQL, you could use:

module "rds_instance" {
  ...
  charset_name                   = "Korean_Wansung_CI_AS"
  ...
}

For mysql and mariadb engines character set of the database can be defined via db_parameter. In this example the database is created with utf8mb4 (character set) and utf8mb4_unicode_ci (collation):

module "rds_instance" {
  ...
  db_parameter = [
    {
      name = "character_set_server"
      value = "utf8mb4"
      apply_method = "immediate"
    },
    {
      name = "collation_server"
      value = "utf8mb4_unicode_ci"
      apply_method = "immediate"
    }
  ]
  ...
}

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	>= 2.0
null	>= 2.0
template	>= 2.0

Providers

Name	Version
aws	>= 2.0

Resources

Name	Type
aws_db_instance.default	resource
aws_db_option_group.default	resource
aws_db_parameter_group.default	resource
aws_db_subnet_group.default	resource
aws_security_group.default	resource
aws_security_group_rule.egress	resource
aws_security_group_rule.ingress_cidr_blocks	resource
aws_security_group_rule.ingress_security_groups	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
allocated_storage	The allocated storage in GBs	number	null	no
allow_major_version_upgrade	Allow major version upgrade	bool	false	no
allowed_cidr_blocks	The whitelisted CIDRs which to allow ingress traffic to the DB instance	list(string)	[]	no
apply_immediately	Specifies whether any database modifications are applied immediately, or during the next maintenance window	bool	false	no
associate_security_group_ids	The IDs of the existing security groups to associate with the DB instance	list(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
auto_minor_version_upgrade	Allow automated minor version upgrade (e.g. from Postgres 9.5.3 to Postgres 9.5.4)	bool	true	no
availability_zone	The AZ for the RDS instance. Specify one of subnet_ids, db_subnet_group_name or availability_zone. If availability_zone is provided, the instance will be placed into the default VPC or EC2 Classic	string	null	no
backup_retention_period	Backup retention period in days. Must be > 0 to enable backups	number	0	no
backup_window	When AWS can perform DB snapshots, can't overlap with maintenance window	string	"22:00-03:00"	no
ca_cert_identifier	The identifier of the CA certificate for the DB instance	string	null	no
charset_name	The character set name to use for DB encoding. Oracle & Microsoft SQL only. For other engines use db_parameter	string	null	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
copy_tags_to_snapshot	Copy tags from DB to a snapshot	bool	true	no
database_name	The name of the database to create when the DB instance is created	string	n/a	yes
database_password	(Required unless a snapshot_identifier or replicate_source_db is provided) Password for the master DB user	string	""	no
database_port	Database port (_e.g._ 3306 for MySQL). Used in the DB Security Group to allow access to the DB instance from the provided security_group_ids	number	n/a	yes
database_user	(Required unless a snapshot_identifier or replicate_source_db is provided) Username for the master DB user	string	""	no
db_options	A list of DB options to apply with an option group. Depends on DB engine	list(object({ db_security_group_memberships = list(string) option_name = string port = number version = string vpc_security_group_memberships = list(string) option_settings = list(object({ name = string value = string })) }))	[]	no
db_parameter	A list of DB parameters to apply. Note that parameters may differ from a DB family to another	list(object({ apply_method = string name = string value = string }))	[]	no
db_parameter_group	The DB parameter group family name. The value depends on DB engine used. See DBParameterGroupFamily for instructions on how to retrieve applicable value.	string	n/a	yes
db_subnet_group_name	Name of DB subnet group. DB instance will be created in the VPC associated with the DB subnet group. Specify one of subnet_ids, db_subnet_group_name or availability_zone	string	null	no
deletion_protection	Set to true to enable deletion protection on the RDS instance	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
dns_zone_id	The ID of the DNS Zone in Route53 where a new DNS record will be created for the DB host name	string	""	no
enabled	Set to false to prevent the module from creating any resources	bool	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	Database engine type	string	null	no
engine_version	Database engine version, depends on engine type	string	n/a	yes
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
final_snapshot_identifier	Final snapshot identifier e.g.: some-db-final-snapshot-2019-06-26-06-05	string	""	no
host_name	The DB host name created in Route53	string	"db"	no
iam_database_authentication_enabled	Specifies whether or mappings of AWS Identity and Access Management (IAM) accounts to database accounts is enabled	bool	false	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
instance_class	Class of RDS instance	string	n/a	yes
iops	The amount of provisioned IOPS. Setting this implies a storage_type of 'io1'. Default is 0 if rds storage type is not 'io1'	number	0	no
kms_key_arn	The ARN of the existing KMS key to encrypt storage	string	""	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
license_model	License model for this DB. Optional, but required for some DB Engines. Valid values: license-included | bring-your-own-license | general-public-license	string	""	no
maintenance_window	The window to perform maintenance in. Syntax: 'ddd:hh24:mi-ddd:hh24:mi' UTC	string	"Mon:03:00-Mon:04:00"	no
major_engine_version	Database MAJOR engine version, depends on engine type	string	""	no
max_allocated_storage	The upper limit to which RDS can automatically scale the storage in GBs	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. Valid Values are 0, 1, 5, 10, 15, 30, 60.	string	"0"	no
monitoring_role_arn	The ARN for the IAM role that permits RDS to send enhanced monitoring metrics to CloudWatch Logs	string	null	no
multi_az	Set to true if multi AZ deployment must be supported	bool	false	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
option_group_name	Name of the DB option group to associate	string	""	no
parameter_group_name	Name of the DB parameter group to associate	string	""	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. Once KMS key is set, it can never be changed.	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
publicly_accessible	Determines if database can be publicly available (NOT recommended)	bool	false	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
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 (if replicating within a single region) or ARN of the Amazon RDS Database to replicate (if replicating cross-region). Note that if you are creating a cross-region replica of an encrypted database you will also need to specify a kms_key_id. See DB Instance Replication and Working with PostgreSQL and MySQL Read Replicas for more information on using Replication.	string	null	no
security_group_ids	The IDs of the security groups from which to allow ingress traffic to the DB instance	list(string)	[]	no
skip_final_snapshot	If true (default), no snapshot will be made before deleting DB	bool	true	no
snapshot_identifier	Snapshot identifier e.g: rds:production-2019-06-26-06-05. If specified, the module create cluster from the snapshot	string	null	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
storage_encrypted	(Optional) Specifies whether the DB instance is encrypted. The default is false if not specified	bool	true	no
storage_type	One of 'standard' (magnetic), 'gp2' (general purpose SSD), or 'io1' (provisioned IOPS SSD)	string	"standard"	no
subnet_ids	List of subnet IDs for the DB. DB instance will be created in the VPC associated with the DB subnet group provisioned using the subnet IDs. Specify one of subnet_ids, db_subnet_group_name or availability_zone	list(string)	[]	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_id	VPC ID the DB instance will be created in	string	n/a	yes

Outputs

Name	Description
hostname	DNS host name of the instance
instance_address	Address of the instance
instance_arn	ARN of the instance
instance_endpoint	DNS Endpoint of the instance
instance_id	ID of the instance
option_group_id	ID of the Option Group
parameter_group_id	ID of the Parameter Group
resource_id	The RDS Resource ID of this instance.
security_group_id	ID of the Security Group
subnet_group_id	ID of the created Subnet Group

Copyright

Copyright © 2017-2021 [mwaghadhare]

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.

Trademarks

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