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main.tf
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/**
* # AWS Aurora Serverless Terraform module
*
*  
*
* AWS Aurora DB Cluster for Serverless Terraform Module.
*
* Gives you:
*
* - A DB subnet group
* - An Aurora DB cluster
* - Optionally RDS 'Enhanced Monitoring' + associated required IAM role/policy (by simply setting the `monitoring_interval` param to > `0`
* - Optionally sensible alarms to SNS (high CPU, high connections, slow replication)
*
* ## Terraform version
*
* Terraform version 0.10.3 or newer is required for this module to work.
*
* ## Contributing
*
* Ensure any variables you add have a type and a description.
* This README is generated with [terraform-docs](https://github.com/segmentio/terraform-docs):
*
* `terraform-docs md . > README.md`
*
* ## Usage examples
*
* *It is recommended you always create a parameter group, even if it exactly matches the defaults.*
* Changing the parameter group in use requires a restart of the DB cluster, modifying parameters within a group
* may not (depending on the parameter being altered)
*
* ### Aurora 1.x (MySQL 5.6)
*
* ```hcl
* resource "aws_sns_topic" "db_alarms_56" {
* name = "aurora-db-alarms-56"
* }
*
* module "aurora_db_56" {
* source = "../.."
* name = "test-aurora-db-56"
* envname = "test56"
* envtype = "test"
* subnets = ["${module.vpc.private_subnets}"]
* azs = ["${module.vpc.availability_zones}"]
* security_groups = ["${aws_security_group.allow_all.id}"]
* username = "root"
* password = "changeme"
* backup_retention_period = "5"
* final_snapshot_identifier = "final-db-snapshot-prod"
* storage_encrypted = "true"
* apply_immediately = "true"
* monitoring_interval = "10"
* cw_alarms = true
* cw_sns_topic = "${aws_sns_topic.db_alarms_56.id}"
* db_parameter_group_name = "${aws_db_parameter_group.aurora_db_56_parameter_group.id}"
* db_cluster_parameter_group_name = "${aws_rds_cluster_parameter_group.aurora_cluster_56_parameter_group.id}"
* }
*
* resource "aws_db_parameter_group" "aurora_db_56_parameter_group" {
* name = "test-aurora-db-56-parameter-group"
* family = "aurora5.6"
* description = "test-aurora-db-56-parameter-group"
* }
*
* resource "aws_rds_cluster_parameter_group" "aurora_cluster_56_parameter_group" {
* name = "test-aurora-56-cluster-parameter-group"
* family = "aurora5.6"
* description = "test-aurora-56-cluster-parameter-group"
* }
* ```
*
* ### Aurora 2.x (MySQL 5.7)
*
* ```hcl
* resource "aws_sns_topic" "db_alarms" {
* name = "aurora-db-alarms"
* }
*
* module "aurora_db_57" {
* source = "../.."
* engine_version = "5.7.12"
* name = "test-aurora-db-57"
* envname = "test-57"
* envtype = "test"
* subnets = ["${module.vpc.private_subnets}"]
* azs = ["${module.vpc.availability_zones}"]
* security_groups = ["${aws_security_group.allow_all.id}"]
* username = "root"
* password = "changeme"
* backup_retention_period = "5"
* final_snapshot_identifier = "final-db-snapshot-prod"
* storage_encrypted = "true"
* apply_immediately = "true"
* monitoring_interval = "10"
* cw_alarms = true
* cw_sns_topic = "${aws_sns_topic.db_alarms.id}"
* db_parameter_group_name = "${aws_db_parameter_group.aurora_db_57_parameter_group.id}"
* db_cluster_parameter_group_name = "${aws_rds_cluster_parameter_group.aurora_57_cluster_parameter_group.id}"
* }
*
* resource "aws_db_parameter_group" "aurora_db_57_parameter_group" {
* name = "test-aurora-db-57-parameter-group"
* family = "aurora-mysql5.7"
* description = "test-aurora-db-57-parameter-group"
* }
*
* resource "aws_rds_cluster_parameter_group" "aurora_57_cluster_parameter_group" {
* name = "test-aurora-57-cluster-parameter-group"
* family = "aurora-mysql5.7"
* description = "test-aurora-57-cluster-parameter-group"
* }
* ```
*
* ### Aurora PostgreSQL
*
* ```hcl
* resource "aws_sns_topic" "db_alarms_postgres96" {
* name = "aurora-db-alarms-postgres96"
* }
*
* module "aurora_db_postgres96" {
* source = "../.."
* engine = "aurora-postgresql"
* engine_version = "9.6.3"
* name = "test-aurora-db-postgres96"
* envname = "test-pg96"
* envtype = "test"
* subnets = ["${module.vpc.private_subnets}"]
* azs = ["${module.vpc.availability_zones}"]
* security_groups = ["${aws_security_group.allow_all.id}"]
* username = "root"
* password = "changeme"
* backup_retention_period = "5"
* final_snapshot_identifier = "final-db-snapshot-prod"
* storage_encrypted = "true"
* apply_immediately = "true"
* monitoring_interval = "10"
* cw_alarms = true
* cw_sns_topic = "${aws_sns_topic.db_alarms_postgres96.id}"
* db_parameter_group_name = "${aws_db_parameter_group.aurora_db_postgres96_parameter_group.id}"
* db_cluster_parameter_group_name = "${aws_rds_cluster_parameter_group.aurora_cluster_postgres96_parameter_group.id}"
* }
*
* resource "aws_db_parameter_group" "aurora_db_postgres96_parameter_group" {
* name = "test-aurora-db-postgres96-parameter-group"
* family = "aurora-postgresql9.6"
* description = "test-aurora-db-postgres96-parameter-group"
* }
*
* resource "aws_rds_cluster_parameter_group" "aurora_cluster_postgres96_parameter_group" {
* name = "test-aurora-postgres96-cluster-parameter-group"
* family = "aurora-postgresql9.6"
* description = "test-aurora-postgres96-cluster-parameter-group"
* }
* ```
*
*
* ## Development
*
* Terraform modules on the Terraform Module Registry are open projects, and community contributions are essential for keeping them great. Please follow our guidelines when contributing changes.
*
* For more information, see our [module contribution guide](https://registry.terraform.io/modules/104corp/aurora-serverless/aws/).
*
* ## Contributors
*
* To see who's already involved, see the list of [contributors](https://github.com/104corp/terraform-aws-aurora-serverless/graphs/contributors).
*/
// Create DB Cluster
resource "aws_rds_cluster" "default" {
count = "${var.enabled ? 1 : 0}"
cluster_identifier = "${var.identifier_prefix != "" ? format("%s-cluster", var.identifier_prefix) : format("%s-aurora-cluster", var.envname)}"
availability_zones = ["${var.azs}"]
engine = "aurora"
engine_version = "${var.engine_version}"
engine_mode = "serverless"
database_name = "${var.database_name}"
master_username = "${var.username}"
master_password = "${var.password}"
final_snapshot_identifier = "${var.final_snapshot_identifier}-${random_id.server.hex}"
skip_final_snapshot = "${var.skip_final_snapshot}"
backup_retention_period = "${var.backup_retention_period}"
preferred_backup_window = "${var.preferred_backup_window}"
preferred_maintenance_window = "${var.preferred_maintenance_window}"
port = "${var.port}"
db_subnet_group_name = "${aws_db_subnet_group.main.name}"
vpc_security_group_ids = ["${var.security_groups}"]
snapshot_identifier = "${var.snapshot_identifier}"
storage_encrypted = "${var.storage_encrypted}"
apply_immediately = "${var.apply_immediately}"
db_cluster_parameter_group_name = "${var.db_cluster_parameter_group_name}"
iam_database_authentication_enabled = "${var.iam_database_authentication_enabled}"
scaling_configuration {
auto_pause = "${var.auto_pause}"
max_capacity = "${var.max_capacity}"
min_capacity = "${var.min_capacity}"
}
lifecycle {
create_before_destroy = true
}
tags = "${local.tags}"
}
// DB Subnet Group creation
resource "aws_db_subnet_group" "main" {
count = "${var.enabled ? 1 : 0}"
name = "${var.name}"
description = "Group of DB subnets"
subnet_ids = ["${var.subnets}"]
tags = "${local.tags}"
}
// Geneate an ID when an environment is initialised
resource "random_id" "server" {
count = "${var.enabled ? 1 : 0}"
keepers = {
id = "${aws_db_subnet_group.main.name}"
}
byte_length = 8
}
// IAM Role + Policy attach for Enhanced Monitoring
data "aws_iam_policy_document" "monitoring-rds-assume-role-policy" {
count = "${var.enabled ? 1 : 0}"
statement {
actions = ["sts:AssumeRole"]
principals {
type = "Service"
identifiers = ["monitoring.rds.amazonaws.com"]
}
}
}
resource "aws_iam_role" "rds-enhanced-monitoring" {
count = "${var.enabled && var.monitoring_interval > 0 ? 1 : 0}"
name_prefix = "rds-enhanced-mon-${var.envname}-"
assume_role_policy = "${data.aws_iam_policy_document.monitoring-rds-assume-role-policy.json}"
}
resource "aws_iam_role_policy_attachment" "rds-enhanced-monitoring-policy-attach" {
count = "${var.enabled && var.monitoring_interval > 0 ? 1 : 0}"
role = "${aws_iam_role.rds-enhanced-monitoring.name}"
policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonRDSEnhancedMonitoringRole"
}