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Terraform module to provision an Amazon DocumentDB cluster.

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Usage

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 "documentdb_cluster" {
  source = "cloudposse/documentdb-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace               = "eg"
  stage                   = "testing"
  name                    = "docdb"
  cluster_size            = 3
  master_username         = "admin1"
  master_password         = "Test123456789"
  instance_class          = "db.r4.large"
  vpc_id                  = "vpc-xxxxxxxx"
  subnet_ids              = ["subnet-xxxxxxxx", "subnet-yyyyyyyy"]
  allowed_security_groups = ["sg-xxxxxxxx"]
  zone_id                 = "Zxxxxxxxx"
}

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

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 >= 1.3
aws >= 5.29.0
local >= 1.3
random >= 1.0

Providers

Name Version
aws >= 5.29.0
random >= 1.0

Modules

Name Source Version
dns_master cloudposse/route53-cluster-hostname/aws 0.13.0
dns_replicas cloudposse/route53-cluster-hostname/aws 0.13.0
ssm_write_db_password cloudposse/ssm-parameter-store/aws 0.13.0
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_docdb_cluster.default resource
aws_docdb_cluster_instance.default resource
aws_docdb_cluster_parameter_group.default resource
aws_docdb_subnet_group.default resource
aws_security_group.default resource
aws_security_group_rule.allow_ingress_from_self resource
aws_security_group_rule.egress resource
aws_security_group_rule.ingress_cidr_blocks resource
aws_security_group_rule.ingress_security_groups resource
random_password.password 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
allow_ingress_from_self Adds the Document DB security group itself as a source for ingress rules. Useful when this security group will be shared with applications. bool false no
allow_major_version_upgrade Specifies whether major version upgrades are allowed. See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/docdb_cluster#allow_major_version_upgrade bool false no
allowed_cidr_blocks List of CIDR blocks to be allowed to connect to the DocumentDB cluster list(string) [] no
allowed_egress_cidr_blocks List of CIDR blocks to be allowed to send traffic outside of the DocumentDB cluster list(string) 
[
  "0.0.0.0/0"
]
 no
allowed_security_groups List of existing Security Groups to be allowed to connect to the DocumentDB 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 Specifies whether any minor engine upgrades will be applied automatically to the DB instance during the maintenance window or not bool true 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 DocumentDB cluster parameter group. For more details, see https://docs.aws.amazon.com/documentdb/latest/developerguide/db-cluster-parameter-group-create.html string "docdb3.6" no
cluster_parameters List of DB 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 3 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_port DocumentDB port number 27017 no
deletion_protection A value that indicates whether the DB cluster has 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_from_port [from_port]DocumentDB initial port range for egress (e.g. 0) number 0 no
egress_protocol DocumentDB protocol for egress (e.g. -1, tcp) string "-1" no
egress_to_port [to_port]DocumentDB initial port range for egress (e.g. 65535) number 0 no
enable_performance_insights Specifies whether to enable Performance Insights for the DB Instance. 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, profiler list(string) [] no
engine The name of the database engine to be used for this DB cluster. Defaults to docdb. Valid values: docdb string "docdb" no
engine_version The version number of the database engine to use string "3.6.0" no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
external_security_group_id_list List of external security group IDs to attach to the Document DB 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_class The instance class to use. For more details, see https://docs.aws.amazon.com/documentdb/latest/developerguide/db-instance-classes.html#db-instance-class-specs string "db.r4.large" no
kms_key_id The ARN for the KMS encryption key. When specifying kms_key_id, 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
master_password (Required unless a snapshot_identifier is provided) Password for the master DB user. Note that this may show up in logs, and it will be stored in the state file. Please refer to the DocumentDB Naming Constraints string "" no
master_username (Required unless a snapshot_identifier is provided) Username for the master DB user string "admin1" 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
preferred_backup_window Daily time range during which the backups happen string "07:00-09:00" no
preferred_maintenance_window The window to perform maintenance in. Syntax: ddd:hh24:mi-ddd:hh24:mi. string "Mon:22:00-Mon:23:00" 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
retention_period Number of days to retain backups for number 5 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. You can use either the name or ARN when specifying a DB cluster snapshot, or the ARN when specifying a DB snapshot string "" no
ssm_parameter_enabled Whether an SSM parameter store value is created to store the database password. bool false no
ssm_parameter_path_prefix The path prefix for the created SSM parameter e.g. '/docdb/master-password/dev'. ssm_parameter_enabled must be set to true for this to take affect. string "/docdb/master-password/" 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 bool true no
storage_type The storage type to associate with the DB cluster. Valid values: standard, iopt1 string "standard" no
subnet_ids List of VPC subnet IDs to place DocumentDB instances in 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
vpc_id VPC ID to create the cluster in (e.g. vpc-a22222ee) string n/a yes
zone_id Route53 parent zone ID. If provided (not empty), the module will create sub-domain DNS records for the DocumentDB master and replicas string "" no

Outputs

Name Description
arn Amazon Resource Name (ARN) of the cluster
cluster_members List of DocumentDB Instances that are a part of this cluster
cluster_name Cluster Identifier
endpoint Endpoint of the DocumentDB cluster
master_host DB master hostname
master_password Password for the master DB user
master_username Username for the master DB user
reader_endpoint A read-only endpoint of the DocumentDB cluster, automatically load-balanced across replicas
replicas_host DB replicas hostname
security_group_arn ARN of the DocumentDB cluster Security Group
security_group_id ID of the DocumentDB cluster Security Group
security_group_name Name of the DocumentDB cluster Security Group

Related Projects

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References

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License

License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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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