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

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Cloud Posse

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

Supports Amazon Aurora Serverless.


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

Terraform Open Source Modules

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 Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA 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"
  # 1 writer, 1 reader
  cluster_size    = 2
  # 1 writer, 3 reader
  # cluster_size    = 4
  # 1 writer, 5 reader
  # cluster_size    = 6
  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 >= 1.0.0
aws >= 4.23.0
null >= 2.0

Providers

Name Version
aws >= 4.23.0

Modules

Name Source Version
dns_master cloudposse/route53-cluster-hostname/aws 0.12.2
dns_replicas cloudposse/route53-cluster-hostname/aws 0.12.2
enhanced_monitoring_label cloudposse/label/null 0.25.0
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_security_group_rule.traffic_inside_security_group resource
aws_iam_policy_document.enhanced_monitoring data source
aws_partition.current 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 Password for the master DB user. Ignored if snapshot_identifier or replication_source_identifier is provided string "" no
admin_user Username for the master DB user. Ignored if snapshot_identifier or replication_source_identifier is provided string "admin" no
allocated_storage The allocated storage in GBs number null 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
ca_cert_identifier The identifier of the CA certificate for the DB instance string null 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_cluster_instance_class This setting is required to create a provisioned Multi-AZ DB cluster string null 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
egress_enabled Whether or not to apply the egress security group rule to default security group, defaults to true bool true 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_attributes The attributes for the enhanced monitoring IAM role list(string)
[
"enhanced-monitoring"
]
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
intra_security_group_traffic_enabled Whether to allow traffic between resources inside the database's security group. bool false no
iops The amount of provisioned IOPS. Setting this implies a storage_type of 'io1'. This setting is required to create a Multi-AZ DB cluster. Check TF docs for values based on db engine number null 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
performance_insights_retention_period Amount of time in days to retain Performance Insights data. Either 7 (7 days) or 731 (2 years) number null 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
serverlessv2_scaling_configuration serverlessv2 scaling properties
object({
min_capacity = number
max_capacity = number
})
null 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
storage_type One of 'standard' (magnetic), 'gp2' (general purpose SSD), or 'io1' (provisioned IOPS SSD) string null no
subnet_group_name Database subnet group name. Will use generated label ID if not supplied. string "" 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 DNS Zone ID as list of string (0 or 1 items). If empty, no custom DNS name will be published.
If the list contains a single Zone ID, a custom DNS name will be pulished in that zone.
Can also be a plain string, but that use is DEPRECATED because of Terraform issues.
any [] 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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Contributors

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

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

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