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main.tf
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main.tf
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locals {
port = var.port == "" ? var.engine == "aurora-postgresql" ? "5432" : "3306" : var.port
master_password = var.password == "" ? random_password.master_password.result : var.password
db_subnet_group_name = var.db_subnet_group_name == "" ? join("", aws_db_subnet_group.this.*.name) : var.db_subnet_group_name
backtrack_window = (var.engine == "aurora-mysql" || var.engine == "aurora") && var.engine_mode != "serverless" ? var.backtrack_window : 0
rds_enhanced_monitoring_arn = join("", aws_iam_role.rds_enhanced_monitoring.*.arn)
rds_enhanced_monitoring_name = join("", aws_iam_role.rds_enhanced_monitoring.*.name)
rds_security_group_id = join("", aws_security_group.this.*.id)
name = "aurora-${var.name}"
}
# Random string to use as master password unless one is specified
resource "random_password" "master_password" {
length = 10
special = false
}
resource "aws_db_subnet_group" "this" {
count = var.db_subnet_group_name == "" ? 1 : 0
name = var.name
description = "For Aurora cluster ${var.name}"
subnet_ids = var.subnets
tags = merge(var.tags, {
Name = local.name
})
}
resource "aws_rds_cluster" "this" {
global_cluster_identifier = var.global_cluster_identifier
cluster_identifier = var.name
replication_source_identifier = var.replication_source_identifier
source_region = var.source_region
engine = var.engine
engine_mode = var.engine_mode
engine_version = var.engine_version
enable_http_endpoint = var.enable_http_endpoint
kms_key_id = var.kms_key_id
database_name = var.database_name
master_username = var.username
master_password = local.master_password
final_snapshot_identifier = "${var.final_snapshot_identifier_prefix}-${var.name}-${random_id.snapshot_identifier.hex}"
skip_final_snapshot = var.skip_final_snapshot
deletion_protection = var.deletion_protection
backup_retention_period = var.backup_retention_period
preferred_backup_window = var.preferred_backup_window
preferred_maintenance_window = var.preferred_maintenance_window
port = local.port
db_subnet_group_name = local.db_subnet_group_name
vpc_security_group_ids = compact(concat(aws_security_group.this.*.id, var.vpc_security_group_ids))
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
backtrack_window = local.backtrack_window
copy_tags_to_snapshot = var.copy_tags_to_snapshot
iam_roles = var.iam_roles
enabled_cloudwatch_logs_exports = var.enabled_cloudwatch_logs_exports
dynamic "scaling_configuration" {
for_each = length(keys(var.scaling_configuration)) == 0 ? [] : [
var.scaling_configuration]
content {
auto_pause = lookup(scaling_configuration.value, "auto_pause", null)
max_capacity = lookup(scaling_configuration.value, "max_capacity", null)
min_capacity = lookup(scaling_configuration.value, "min_capacity", null)
seconds_until_auto_pause = lookup(scaling_configuration.value, "seconds_until_auto_pause", null)
timeout_action = lookup(scaling_configuration.value, "timeout_action", null)
}
}
tags = var.tags
}
resource "aws_rds_cluster_instance" "this" {
count = var.replica_scale_enabled ? var.replica_scale_min : var.replica_count
identifier = "${var.name}-${count.index + 1}"
cluster_identifier = aws_rds_cluster.this.id
engine = var.engine
engine_version = var.engine_version
instance_class = var.instance_type
publicly_accessible = var.publicly_accessible
db_subnet_group_name = local.db_subnet_group_name
db_parameter_group_name = var.db_parameter_group_name
preferred_maintenance_window = var.preferred_maintenance_window
apply_immediately = var.apply_immediately
monitoring_role_arn = local.rds_enhanced_monitoring_arn
monitoring_interval = var.monitoring_interval
auto_minor_version_upgrade = var.auto_minor_version_upgrade
promotion_tier = count.index + 1
performance_insights_enabled = var.performance_insights_enabled
performance_insights_kms_key_id = var.performance_insights_kms_key_id
ca_cert_identifier = var.ca_cert_identifier
tags = var.tags
}
resource "random_id" "snapshot_identifier" {
keepers = {
id = var.name
}
byte_length = 4
}
data "aws_iam_policy_document" "monitoring_rds_assume_role" {
statement {
actions = ["sts:AssumeRole"]
principals {
type = "Service"
identifiers = ["monitoring.rds.amazonaws.com"]
}
}
}
resource "aws_iam_role" "rds_enhanced_monitoring" {
count = var.monitoring_interval > 0 ? 1 : 0
name = "rds-enhanced-monitoring-${var.name}"
assume_role_policy = data.aws_iam_policy_document.monitoring_rds_assume_role.json
}
resource "aws_iam_role_policy_attachment" "rds_enhanced_monitoring" {
count = var.monitoring_interval > 0 ? 1 : 0
role = local.rds_enhanced_monitoring_name
policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonRDSEnhancedMonitoringRole"
}
resource "aws_appautoscaling_target" "read_replica_count" {
count = var.replica_scale_enabled ? 1 : 0
max_capacity = var.replica_scale_max
min_capacity = var.replica_scale_min
resource_id = "cluster:${aws_rds_cluster.this.cluster_identifier}"
scalable_dimension = "rds:cluster:ReadReplicaCount"
service_namespace = "rds"
}
resource "aws_appautoscaling_policy" "autoscaling_read_replica_count" {
count = var.replica_scale_enabled ? 1 : 0
name = "target-metric"
policy_type = "TargetTrackingScaling"
resource_id = "cluster:${aws_rds_cluster.this.cluster_identifier}"
scalable_dimension = "rds:cluster:ReadReplicaCount"
service_namespace = "rds"
target_tracking_scaling_policy_configuration {
predefined_metric_specification {
predefined_metric_type = var.predefined_metric_type
}
scale_in_cooldown = var.replica_scale_in_cooldown
scale_out_cooldown = var.replica_scale_out_cooldown
target_value = var.predefined_metric_type == "RDSReaderAverageCPUUtilization" ? var.replica_scale_cpu : var.replica_scale_connections
}
depends_on = [aws_appautoscaling_target.read_replica_count]
}
resource "aws_security_group" "this" {
count = var.create_security_group ? 1 : 0
name_prefix = "${var.name}-"
vpc_id = var.vpc_id
description = var.security_group_description == "" ? "Control traffic to/from RDS Aurora ${var.name}" : var.security_group_description
tags = merge(var.tags, {
Name = local.name
})
}
resource "aws_security_group_rule" "default_ingress" {
count = var.create_security_group ? length(var.allowed_security_groups) : 0
description = "From allowed SGs"
type = "ingress"
from_port = aws_rds_cluster.this.port
to_port = aws_rds_cluster.this.port
protocol = "tcp"
source_security_group_id = element(var.allowed_security_groups, count.index)
security_group_id = local.rds_security_group_id
}
resource "aws_security_group_rule" "cidr_ingress" {
count = var.create_security_group && length(var.allowed_cidr_blocks) > 0 ? 1 : 0
description = "From allowed CIDRs"
type = "ingress"
from_port = aws_rds_cluster.this.port
to_port = aws_rds_cluster.this.port
protocol = "tcp"
cidr_blocks = var.allowed_cidr_blocks
security_group_id = local.rds_security_group_id
}