terraform-aws-rds-cluster

Terraform module to provision an RDS Aurora cluster for MySQL or Postgres.

Supports Amazon Aurora Serverless.

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

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

We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

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.

Basic example

module "rds_cluster_aurora_postgres" {
  source = "cloudposse/rds-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  name            = "postgres"
  engine          = "aurora-postgresql"
  cluster_family  = "aurora-postgresql9.6"
  cluster_size    = 2
  namespace       = "eg"
  stage           = "dev"
  admin_user      = "admin1"
  admin_password  = "Test123456789"
  db_name         = "dbname"
  db_port         = 5432
  instance_type   = "db.r4.large"
  vpc_id          = "vpc-xxxxxxxx"
  security_groups = ["sg-xxxxxxxx"]
  subnets         = ["subnet-xxxxxxxx", "subnet-xxxxxxxx"]
  zone_id         = "Zxxxxxxxx"
}

Serverless Aurora MySQL 5.6

module "rds_cluster_aurora_mysql_serverless" {
  source = "cloudposse/rds-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace            = "eg"
  stage                = "dev"
  name                 = "db"
  engine               = "aurora"
  engine_mode          = "serverless"
  cluster_family       = "aurora5.6"
  cluster_size         = 0
  admin_user           = "admin1"
  admin_password       = "Test123456789"
  db_name              = "dbname"
  db_port              = 3306
  instance_type        = "db.t2.small"
  vpc_id               = "vpc-xxxxxxxx"
  security_groups      = ["sg-xxxxxxxx"]
  subnets              = ["subnet-xxxxxxxx", "subnet-xxxxxxxx"]
  zone_id              = "Zxxxxxxxx"
  enable_http_endpoint = true

  scaling_configuration = [
    {
      auto_pause               = true
      max_capacity             = 256
      min_capacity             = 2
      seconds_until_auto_pause = 300
    }
  ]
}

Serverless Aurora 2.07.1 MySQL 5.7

module "rds_cluster_aurora_mysql_serverless" {
  source = "cloudposse/rds-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace            = "eg"
  stage                = "dev"
  name                 = "db"
  engine               = "aurora-mysql"
  engine_mode          = "serverless"
  engine_version       = "5.7.mysql_aurora.2.07.1"
  cluster_family       = "aurora-mysql5.7"
  cluster_size         = 0
  admin_user           = "admin1"
  admin_password       = "Test123456789"
  db_name              = "dbname"
  db_port              = 3306
  vpc_id               = "vpc-xxxxxxxx"
  security_groups      = ["sg-xxxxxxxx"]
  subnets              = ["subnet-xxxxxxxx", "subnet-xxxxxxxx"]
  zone_id              = "Zxxxxxxxx"
  enable_http_endpoint = true

  scaling_configuration = [
    {
      auto_pause               = true
      max_capacity             = 16
      min_capacity             = 1
      seconds_until_auto_pause = 300
      timeout_action           = "ForceApplyCapacityChange"
    }
  ]
}

With cluster parameters

module "rds_cluster_aurora_mysql" {
  source = "cloudposse/rds-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  engine          = "aurora"
  cluster_family  = "aurora-mysql5.7"
  cluster_size    = 2
  namespace       = "eg"
  stage           = "dev"
  name            = "db"
  admin_user      = "admin1"
  admin_password  = "Test123456789"
  db_name         = "dbname"
  instance_type   = "db.t2.small"
  vpc_id          = "vpc-xxxxxxx"
  security_groups = ["sg-xxxxxxxx"]
  subnets         = ["subnet-xxxxxxxx", "subnet-xxxxxxxx"]
  zone_id         = "Zxxxxxxxx"

  cluster_parameters = [
    {
      name  = "character_set_client"
      value = "utf8"
    },
    {
      name  = "character_set_connection"
      value = "utf8"
    },
    {
      name  = "character_set_database"
      value = "utf8"
    },
    {
      name  = "character_set_results"
      value = "utf8"
    },
    {
      name  = "character_set_server"
      value = "utf8"
    },
    {
      name  = "collation_connection"
      value = "utf8_bin"
    },
    {
      name  = "collation_server"
      value = "utf8_bin"
    },
    {
      name         = "lower_case_table_names"
      value        = "1"
      apply_method = "pending-reboot"
    },
    {
      name         = "skip-character-set-client-handshake"
      value        = "1"
      apply_method = "pending-reboot"
    }
  ]
}

With enhanced monitoring

# create IAM role for monitoring
resource "aws_iam_role" "enhanced_monitoring" {
  name               = "rds-cluster-example-1"
  assume_role_policy = data.aws_iam_policy_document.enhanced_monitoring.json
}

# Attach Amazon's managed policy for RDS enhanced monitoring
resource "aws_iam_role_policy_attachment" "enhanced_monitoring" {
  role       = aws_iam_role.enhanced_monitoring.name
  policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonRDSEnhancedMonitoringRole"
}

# allow rds to assume this role
data "aws_iam_policy_document" "enhanced_monitoring" {
  statement {
      actions = [
      "sts:AssumeRole",
    ]

    effect = "Allow"

    principals {
      type        = "Service"
      identifiers = ["monitoring.rds.amazonaws.com"]
    }
  }
}

module "rds_cluster_aurora_postgres" {
  source = "cloudposse/rds-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  engine          = "aurora-postgresql"
  cluster_family  = "aurora-postgresql9.6"
  cluster_size    = 2
  namespace       = "eg"
  stage           = "dev"
  name            = "db"
  admin_user      = "admin1"
  admin_password  = "Test123456789"
  db_name         = "dbname"
  db_port         = 5432
  instance_type   = "db.r4.large"
  vpc_id          = "vpc-xxxxxxx"
  security_groups = ["sg-xxxxxxxx"]
  subnets         = ["subnet-xxxxxxxx", "subnet-xxxxxxxx"]
  zone_id         = "Zxxxxxxxx"

  # enable monitoring every 30 seconds
  rds_monitoring_interval = 30

  # reference iam role created above
  rds_monitoring_role_arn = aws_iam_role.enhanced_monitoring.arn
}

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
null	>= 2.0

Providers

Name	Version
aws	>= 3.1.15

Modules

Name	Source	Version
dns_master	cloudposse/route53-cluster-hostname/aws	0.12.0
dns_replicas	cloudposse/route53-cluster-hostname/aws	0.12.0
enhanced_monitoring_label	cloudposse/label/null	0.24.1
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_appautoscaling_policy.replicas	resource
aws_appautoscaling_target.replicas	resource
aws_db_parameter_group.default	resource
aws_db_subnet_group.default	resource
aws_iam_role.enhanced_monitoring	resource
aws_iam_role_policy_attachment.enhanced_monitoring	resource
aws_rds_cluster.primary	resource
aws_rds_cluster.secondary	resource
aws_rds_cluster_instance.default	resource
aws_rds_cluster_parameter_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
aws_iam_policy_document.enhanced_monitoring	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
admin_password	(Required unless a snapshot_identifier is provided) Password for the master DB user	string	""	no
admin_user	(Required unless a snapshot_identifier is provided) Username for the master DB user	string	"admin"	no
allow_major_version_upgrade	Enable to allow major engine version upgrades when changing engine versions. Defaults to false.	bool	false	no
allowed_cidr_blocks	List of CIDR blocks allowed to access the cluster	list(string)	[]	no
apply_immediately	Specifies whether any cluster modifications are applied immediately, or during the next maintenance window	bool	true	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	Indicates that minor engine upgrades will be applied automatically to the DB instance during the maintenance window	bool	true	no
autoscaling_enabled	Whether to enable cluster autoscaling	bool	false	no
autoscaling_max_capacity	Maximum number of instances to be maintained by the autoscaler	number	5	no
autoscaling_min_capacity	Minimum number of instances to be maintained by the autoscaler	number	1	no
autoscaling_policy_type	Autoscaling policy type. TargetTrackingScaling and StepScaling are supported	string	"TargetTrackingScaling"	no
autoscaling_scale_in_cooldown	The amount of time, in seconds, after a scaling activity completes and before the next scaling down activity can start. Default is 300s	number	300	no
autoscaling_scale_out_cooldown	The amount of time, in seconds, after a scaling activity completes and before the next scaling up activity can start. Default is 300s	number	300	no
autoscaling_target_metrics	The metrics type to use. If this value isn't provided the default is CPU utilization	string	"RDSReaderAverageCPUUtilization"	no
autoscaling_target_value	The target value to scale with respect to target metrics	number	75	no
backtrack_window	The target backtrack window, in seconds. Only available for aurora engine currently. Must be between 0 and 259200 (72 hours)	number	0	no
backup_window	Daily time range during which the backups happen	string	"07:00-09:00"	no
cluster_dns_name	Name of the cluster CNAME record to create in the parent DNS zone specified by zone_id. If left empty, the name will be auto-asigned using the format master.var.name	string	""	no
cluster_family	The family of the DB cluster parameter group	string	"aurora5.6"	no
cluster_identifier	The RDS Cluster Identifier. Will use generated label ID if not supplied	string	""	no
cluster_parameters	List of DB cluster parameters to apply	list(object({ apply_method = string name = string value = string }))	[]	no
cluster_size	Number of DB instances to create in the cluster	number	2	no
cluster_type	Either regional or global. If regional will be created as a normal, standalone DB. If global, will be made part of a Global cluster (requires global_cluster_identifier).	string	"regional"	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 to backup snapshots	bool	false	no
db_name	Database name (default is not to create a database)	string	""	no
db_port	Database port	number	3306	no
deletion_protection	If the DB instance should have deletion protection enabled	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
enable_http_endpoint	Enable HTTP endpoint (data API). Only valid when engine_mode is set to serverless	bool	false	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 export to cloudwatch. The following log types are supported: audit, error, general, slowquery	list(string)	[]	no
engine	The name of the database engine to be used for this DB cluster. Valid values: aurora, aurora-mysql, aurora-postgresql	string	"aurora"	no
engine_mode	The database engine mode. Valid values: parallelquery, provisioned, serverless	string	"provisioned"	no
engine_version	The version of the database engine to use. See aws rds describe-db-engine-versions	string	""	no
enhanced_monitoring_role_enabled	A boolean flag to enable/disable the creation of the enhanced monitoring IAM role. If set to false, the module will not create a new role and will use rds_monitoring_role_arn for enhanced monitoring	bool	false	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
global_cluster_identifier	ID of the Aurora global cluster	string	""	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
iam_roles	Iam roles for the Aurora cluster	list(string)	[]	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_availability_zone	Optional parameter to place cluster instances in a specific availability zone. If left empty, will place randomly	string	""	no
instance_parameters	List of DB instance parameters to apply	list(object({ apply_method = string name = string value = string }))	[]	no
instance_type	Instance type to use	string	"db.t2.small"	no
kms_key_arn	The ARN for the KMS encryption key. When specifying kms_key_arn, storage_encrypted needs to be set to true	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
maintenance_window	Weekly time range during which system maintenance can occur, in UTC	string	"wed:03:00-wed:04:00"	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
performance_insights_enabled	Whether to enable Performance Insights	bool	false	no
performance_insights_kms_key_id	The ARN for the KMS key to encrypt Performance Insights data. When specifying performance_insights_kms_key_id, performance_insights_enabled needs to be set to true	string	""	no
publicly_accessible	Set to true if you want your cluster to be publicly accessible (such as via QuickSight)	bool	false	no
rds_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
rds_monitoring_role_arn	The ARN for the IAM role that permits RDS to send enhanced monitoring metrics to CloudWatch Logs	string	null	no
reader_dns_name	Name of the reader endpoint CNAME record to create in the parent DNS zone specified by zone_id. If left empty, the name will be auto-asigned using the format replicas.var.name	string	""	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
replication_source_identifier	ARN of a source DB cluster or DB instance if this DB cluster is to be created as a Read Replica	string	""	no
restore_to_point_in_time	List point-in-time recovery options. Only valid actions are source_cluster_identifier, restore_type and use_latest_restorable_time	list(object({ source_cluster_identifier = string restore_type = string use_latest_restorable_time = bool }))	[]	no
retention_period	Number of days to retain backups for	number	5	no
s3_import	Restore from a Percona Xtrabackup in S3. The bucket_name is required to be in the same region as the resource.	object({ bucket_name = string bucket_prefix = string ingestion_role = string source_engine = string source_engine_version = string })	null	no
scaling_configuration	List of nested attributes with scaling properties. Only valid when engine_mode is set to serverless	list(object({ auto_pause = bool max_capacity = number min_capacity = number seconds_until_auto_pause = number timeout_action = string }))	[]	no
security_groups	List of security groups to be allowed to connect to the DB instance	list(string)	[]	no
skip_final_snapshot	Determines whether a final DB snapshot is created before the DB cluster is deleted	bool	true	no
snapshot_identifier	Specifies whether or not to create this cluster from a snapshot	string	null	no
source_region	Source Region of primary cluster, needed when using encrypted storage and region replicas	string	""	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
storage_encrypted	Specifies whether the DB cluster is encrypted. The default is false for provisioned engine_mode and true for serverless engine_mode	bool	false	no
subnets	List of VPC subnet IDs	list(string)	n/a	yes
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
timeouts_configuration	List of timeout values per action. Only valid actions are create, update and delete	list(object({ create = string update = string delete = string }))	[]	no
vpc_id	VPC ID to create the cluster in (e.g. vpc-a22222ee)	string	n/a	yes
vpc_security_group_ids	Additional security group IDs to apply to the cluster, in addition to the provisioned default security group with ingress traffic from existing CIDR blocks and existing security groups	list(string)	[]	no
zone_id	Route53 parent zone ID. If provided (not empty), the module will create sub-domain DNS records for the DB master and replicas	string	""	no

Outputs

Name	Description
arn	Amazon Resource Name (ARN) of the cluster
cluster_identifier	Cluster Identifier
cluster_resource_id	The region-unique, immutable identifie of the cluster
cluster_security_groups	Default RDS cluster security groups
database_name	Database name
dbi_resource_ids	List of the region-unique, immutable identifiers for the DB instances in the cluster
endpoint	The DNS address of the RDS instance
master_host	DB Master hostname
master_username	Username for the master DB user
reader_endpoint	A read-only endpoint for the Aurora cluster, automatically load-balanced across replicas
replicas_host	Replicas hostname
security_group_arn	Security Group ARN
security_group_id	Security Group ID
security_group_name	Security Group name

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Related Projects

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• 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

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Contributors

Erik Osterman	Igor Rodionov	Andriy Knysh	Sarkis Varozian	Mike Crowe	Sergey Vasilyev	Todor Todorov	Lee Huffman