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main.tf
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data "aws_partition" "current" {}
locals {
create = var.create && var.putin_khuylo
port = coalesce(var.port, (var.engine == "aurora-postgresql" || var.engine == "postgres" ? 5432 : 3306))
master_password = var.create_cluster && var.create_random_password && var.is_primary_cluster ? random_password.master_password[0].result : var.password
internal_db_subnet_group_name = try(coalesce(var.db_subnet_group_name, var.name), "")
db_subnet_group_name = var.create_db_subnet_group ? try(aws_db_subnet_group.this[0].name, null) : local.internal_db_subnet_group_name
security_group_name = try(coalesce(var.security_group_name, var.name), "")
cluster_parameter_group_name = try(coalesce(var.db_cluster_parameter_group_name, var.name), null)
db_parameter_group_name = try(coalesce(var.db_parameter_group_name, var.name), null)
backtrack_window = (var.engine == "aurora-mysql" || var.engine == "aurora") && var.engine_mode != "serverless" ? var.backtrack_window : 0
is_serverless = var.engine_mode == "serverless"
}
resource "random_id" "snapshot_identifier" {
count = var.create_cluster ? 1 : 0
keepers = {
id = var.name
}
byte_length = 4
}
# Random string to use as master password
resource "random_password" "master_password" {
count = var.create_cluster && var.create_random_password ? 1 : 0
length = 10
special = false
}
################################################################################
# DB Subnet Group
################################################################################
resource "aws_db_subnet_group" "this" {
count = local.create && var.create_db_subnet_group ? 1 : 0
name = local.internal_db_subnet_group_name
description = "For Aurora cluster ${var.name}"
subnet_ids = var.subnets
tags = var.tags
}
################################################################################
# Cluster
################################################################################
resource "aws_rds_cluster" "this" {
count = local.create ? 1 : 0
allocated_storage = var.allocated_storage
allow_major_version_upgrade = var.allow_major_version_upgrade
apply_immediately = var.apply_immediately
availability_zones = var.availability_zones
backup_retention_period = var.backup_retention_period
backtrack_window = local.backtrack_window
cluster_identifier = var.cluster_use_name_prefix ? null : var.name
cluster_identifier_prefix = var.cluster_use_name_prefix ? "${var.name}-" : null
cluster_members = var.cluster_members
copy_tags_to_snapshot = var.copy_tags_to_snapshot
database_name = var.is_primary_cluster ? var.database_name : null
db_cluster_instance_class = var.db_cluster_instance_class
db_cluster_parameter_group_name = var.create_db_cluster_parameter_group ? aws_rds_cluster_parameter_group.this[0].id : var.db_cluster_parameter_group_name
db_instance_parameter_group_name = var.allow_major_version_upgrade ? var.db_cluster_db_instance_parameter_group_name : null
db_subnet_group_name = local.db_subnet_group_name
delete_automated_backups = var.delete_automated_backups
deletion_protection = var.deletion_protection
enable_global_write_forwarding = var.enable_global_write_forwarding
enabled_cloudwatch_logs_exports = var.enabled_cloudwatch_logs_exports
enable_http_endpoint = var.enable_http_endpoint
engine = var.engine
engine_mode = var.engine_mode
engine_version = var.engine_version
final_snapshot_identifier = var.final_snapshot_identifier
global_cluster_identifier = var.global_cluster_identifier
iam_database_authentication_enabled = var.iam_database_authentication_enabled
# iam_roles has been removed from this resource and instead will be used with aws_rds_cluster_role_association below to avoid conflicts per docs
iops = var.iops
kms_key_id = var.kms_key_id
manage_master_user_password = var.global_cluster_identifier == null && var.manage_master_user_password ? var.manage_master_user_password : null
master_user_secret_kms_key_id = var.global_cluster_identifier == null && var.manage_master_user_password ? var.master_user_secret_kms_key_id : null
master_password = local.master_password #var.is_primary_cluster && !var.manage_master_user_password ? var.master_password : null
master_username = var.is_primary_cluster ? var.master_username : null
network_type = var.network_type
port = local.port
preferred_backup_window = local.is_serverless ? null : var.preferred_backup_window
preferred_maintenance_window = local.is_serverless ? null : var.preferred_maintenance_window
replication_source_identifier = var.replication_source_identifier
dynamic "restore_to_point_in_time" {
for_each = length(var.restore_to_point_in_time) > 0 ? [var.restore_to_point_in_time] : []
content {
restore_to_time = try(restore_to_point_in_time.value.restore_to_time, null)
restore_type = try(restore_to_point_in_time.value.restore_type, null)
source_cluster_identifier = restore_to_point_in_time.value.source_cluster_identifier
use_latest_restorable_time = try(restore_to_point_in_time.value.use_latest_restorable_time, null)
}
}
dynamic "s3_import" {
for_each = length(var.s3_import) > 0 && !local.is_serverless ? [var.s3_import] : []
content {
bucket_name = s3_import.value.bucket_name
bucket_prefix = try(s3_import.value.bucket_prefix, null)
ingestion_role = s3_import.value.ingestion_role
source_engine = "mysql"
source_engine_version = s3_import.value.source_engine_version
}
}
dynamic "scaling_configuration" {
for_each = length(var.scaling_configuration) > 0 && local.is_serverless ? [var.scaling_configuration] : []
content {
auto_pause = try(scaling_configuration.value.auto_pause, null)
max_capacity = try(scaling_configuration.value.max_capacity, null)
min_capacity = try(scaling_configuration.value.min_capacity, null)
seconds_until_auto_pause = try(scaling_configuration.value.seconds_until_auto_pause, null)
timeout_action = try(scaling_configuration.value.timeout_action, null)
}
}
dynamic "serverlessv2_scaling_configuration" {
for_each = length(var.serverlessv2_scaling_configuration) > 0 && var.engine_mode == "provisioned" ? [var.serverlessv2_scaling_configuration] : []
content {
max_capacity = serverlessv2_scaling_configuration.value.max_capacity
min_capacity = serverlessv2_scaling_configuration.value.min_capacity
}
}
skip_final_snapshot = var.skip_final_snapshot
snapshot_identifier = var.snapshot_identifier
source_region = var.source_region
storage_encrypted = var.storage_encrypted
storage_type = var.storage_type
tags = merge(var.tags, var.cluster_tags)
vpc_security_group_ids = compact(concat([try(aws_security_group.this[0].id, "")], var.vpc_security_group_ids))
timeouts {
create = try(var.cluster_timeouts.create, null)
update = try(var.cluster_timeouts.update, null)
delete = try(var.cluster_timeouts.delete, null)
}
lifecycle {
ignore_changes = [
# See https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/rds_cluster#replication_source_identifier
# Since this is used either in read-replica clusters or global clusters, this should be acceptable to specify
replication_source_identifier,
# See docs here https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/rds_global_cluster#new-global-cluster-from-existing-db-cluster
global_cluster_identifier,
snapshot_identifier,
]
}
depends_on = [aws_cloudwatch_log_group.this]
}
################################################################################
# Cluster Instance(s)
################################################################################
resource "aws_rds_cluster_instance" "this" {
for_each = { for k, v in var.instances : k => v if local.create && !local.is_serverless }
apply_immediately = try(each.value.apply_immediately, var.apply_immediately)
auto_minor_version_upgrade = try(each.value.auto_minor_version_upgrade, var.auto_minor_version_upgrade)
availability_zone = try(each.value.availability_zone, null)
ca_cert_identifier = var.ca_cert_identifier
cluster_identifier = var.cluster_identifier_instance
copy_tags_to_snapshot = try(each.value.copy_tags_to_snapshot, var.copy_tags_to_snapshot)
db_parameter_group_name = var.create_db_parameter_group ? aws_db_parameter_group.this[0].id : try(each.value.db_parameter_group_name, var.db_parameter_group_name)
db_subnet_group_name = var.db_subnet_group_name_instance
engine = var.engine
engine_version = var.engine_version
identifier = var.instances_use_identifier_prefix ? null : try(each.value.identifier, "${var.name}-${each.key}")
identifier_prefix = var.instances_use_identifier_prefix ? try(each.value.identifier_prefix, "${var.name}-${each.key}-") : null
instance_class = try(each.value.instance_class, var.instance_class)
monitoring_interval = try(each.value.monitoring_interval, var.monitoring_interval)
monitoring_role_arn = var.create_monitoring_role ? try(aws_iam_role.rds_enhanced_monitoring[0].arn, null) : var.monitoring_role_arn
performance_insights_enabled = try(each.value.performance_insights_enabled, var.performance_insights_enabled)
performance_insights_kms_key_id = try(each.value.performance_insights_kms_key_id, var.performance_insights_kms_key_id)
performance_insights_retention_period = try(each.value.performance_insights_retention_period, var.performance_insights_retention_period)
# preferred_backup_window - is set at the cluster level and will error if provided here
preferred_maintenance_window = try(each.value.preferred_maintenance_window, var.preferred_maintenance_window)
promotion_tier = try(each.value.promotion_tier, null)
publicly_accessible = try(each.value.publicly_accessible, var.publicly_accessible)
tags = merge(var.tags, try(each.value.tags, {}))
timeouts {
create = try(var.instance_timeouts.create, null)
update = try(var.instance_timeouts.update, null)
delete = try(var.instance_timeouts.delete, null)
}
}
################################################################################
# Cluster Endpoint(s)
################################################################################
resource "aws_rds_cluster_endpoint" "this" {
for_each = { for k, v in var.endpoints : k => v if local.create && !local.is_serverless }
cluster_endpoint_identifier = each.value.identifier
cluster_identifier = aws_rds_cluster.this[0].id
custom_endpoint_type = each.value.type
excluded_members = try(each.value.excluded_members, null)
static_members = try(each.value.static_members, null)
tags = merge(var.tags, try(each.value.tags, {}))
depends_on = [
aws_rds_cluster_instance.this
]
}
################################################################################
# Cluster IAM Roles
################################################################################
resource "aws_rds_cluster_role_association" "this" {
for_each = { for k, v in var.iam_roles : k => v if local.create }
db_cluster_identifier = aws_rds_cluster.this[0].id
feature_name = each.value.feature_name
role_arn = each.value.role_arn
}
################################################################################
# Enhanced Monitoring
################################################################################
locals {
create_monitoring_role = local.create && var.create_monitoring_role && var.monitoring_interval > 0
}
data "aws_iam_policy_document" "monitoring_rds_assume_role" {
count = local.create_monitoring_role ? 1 : 0
statement {
actions = ["sts:AssumeRole"]
principals {
type = "Service"
identifiers = ["monitoring.rds.${data.aws_partition.current.dns_suffix}"]
}
}
}
resource "aws_iam_role" "rds_enhanced_monitoring" {
count = local.create_monitoring_role ? 1 : 0
name = var.iam_role_use_name_prefix ? null : var.iam_role_name
name_prefix = var.iam_role_use_name_prefix ? "${var.iam_role_name}-" : null
description = var.iam_role_description
path = var.iam_role_path
assume_role_policy = data.aws_iam_policy_document.monitoring_rds_assume_role[0].json
managed_policy_arns = var.iam_role_managed_policy_arns
permissions_boundary = var.iam_role_permissions_boundary
force_detach_policies = var.iam_role_force_detach_policies
max_session_duration = var.iam_role_max_session_duration
tags = var.tags
}
resource "aws_iam_role_policy_attachment" "rds_enhanced_monitoring" {
count = local.create_monitoring_role ? 1 : 0
role = aws_iam_role.rds_enhanced_monitoring[0].name
policy_arn = "arn:${data.aws_partition.current.partition}:iam::aws:policy/service-role/AmazonRDSEnhancedMonitoringRole"
}
################################################################################
# Autoscaling
################################################################################
resource "aws_appautoscaling_target" "this" {
count = local.create && var.autoscaling_enabled && !local.is_serverless ? 1 : 0
max_capacity = var.autoscaling_max_capacity
min_capacity = var.autoscaling_min_capacity
resource_id = "cluster:${aws_rds_cluster.this[0].cluster_identifier}"
scalable_dimension = "rds:cluster:ReadReplicaCount"
service_namespace = "rds"
tags = var.tags
}
resource "aws_appautoscaling_policy" "this" {
count = local.create && var.autoscaling_enabled && !local.is_serverless ? 1 : 0
name = var.autoscaling_policy_name
policy_type = "TargetTrackingScaling"
resource_id = "cluster:${aws_rds_cluster.this[0].cluster_identifier}"
scalable_dimension = "rds:cluster:ReadReplicaCount"
service_namespace = "rds"
target_tracking_scaling_policy_configuration {
predefined_metric_specification {
predefined_metric_type = var.predefined_metric_type
}
scale_in_cooldown = var.autoscaling_scale_in_cooldown
scale_out_cooldown = var.autoscaling_scale_out_cooldown
target_value = var.predefined_metric_type == "RDSReaderAverageCPUUtilization" ? var.autoscaling_target_cpu : var.autoscaling_target_connections
}
depends_on = [
aws_appautoscaling_target.this
]
}
################################################################################
# Security Group
################################################################################
resource "aws_security_group" "this" {
count = local.create && var.create_security_group ? 1 : 0
name = var.security_group_use_name_prefix ? null : local.security_group_name
name_prefix = var.security_group_use_name_prefix ? "${local.security_group_name}-" : null
vpc_id = var.vpc_id
description = coalesce(var.security_group_description, "Control traffic to/from RDS Aurora ${var.name}")
tags = merge(var.tags, var.security_group_tags, { Name = local.security_group_name })
lifecycle {
create_before_destroy = true
}
}
resource "aws_security_group_rule" "this" {
for_each = { for k, v in var.security_group_rules : k => v if local.create && var.create_security_group }
# required
type = try(each.value.type, "ingress")
from_port = try(each.value.from_port, local.port)
to_port = try(each.value.to_port, local.port)
protocol = try(each.value.protocol, "tcp")
security_group_id = aws_security_group.this[0].id
# optional
cidr_blocks = try(each.value.cidr_blocks, null)
description = try(each.value.description, null)
ipv6_cidr_blocks = try(each.value.ipv6_cidr_blocks, null)
prefix_list_ids = try(each.value.prefix_list_ids, null)
source_security_group_id = try(each.value.source_security_group_id, null)
}
################################################################################
# Cluster Parameter Group
################################################################################
resource "aws_rds_cluster_parameter_group" "this" {
count = local.create && var.create_db_cluster_parameter_group ? 1 : 0
name = var.db_cluster_parameter_group_use_name_prefix ? null : local.cluster_parameter_group_name
name_prefix = var.db_cluster_parameter_group_use_name_prefix ? "${local.cluster_parameter_group_name}-" : null
description = var.db_cluster_parameter_group_description
family = var.db_cluster_parameter_group_family
dynamic "parameter" {
for_each = var.db_cluster_parameter_group_parameters
content {
name = parameter.value.name
value = parameter.value.value
apply_method = try(parameter.value.apply_method, "immediate")
}
}
lifecycle {
create_before_destroy = true
}
tags = var.tags
}
################################################################################
# DB Parameter Group
################################################################################
resource "aws_db_parameter_group" "this" {
count = local.create && var.create_db_parameter_group ? 1 : 0
name = var.db_parameter_group_use_name_prefix ? null : local.db_parameter_group_name
name_prefix = var.db_parameter_group_use_name_prefix ? "${local.db_parameter_group_name}-" : null
description = var.db_parameter_group_description
family = var.db_parameter_group_family
dynamic "parameter" {
for_each = var.db_parameter_group_parameters
content {
name = parameter.value.name
value = parameter.value.value
apply_method = try(parameter.value.apply_method, "immediate")
}
}
lifecycle {
create_before_destroy = true
}
tags = var.tags
}
################################################################################
# CloudWatch Log Group
################################################################################
# Log groups will not be created if using a cluster identifier prefix
resource "aws_cloudwatch_log_group" "this" {
for_each = toset([for log in var.enabled_cloudwatch_logs_exports : log if local.create && var.create_cloudwatch_log_group && !var.cluster_use_name_prefix])
name = "/aws/rds/cluster/${var.name}/${each.value}"
retention_in_days = var.cloudwatch_log_group_retention_in_days
kms_key_id = var.cloudwatch_log_group_kms_key_id
tags = var.tags
}
################################################################################
# Cluster Activity Stream
################################################################################
resource "aws_rds_cluster_activity_stream" "this" {
count = local.create && var.create_db_cluster_activity_stream ? 1 : 0
resource_arn = aws_rds_cluster.this[0].arn
mode = var.db_cluster_activity_stream_mode
kms_key_id = var.db_cluster_activity_stream_kms_key_id
engine_native_audit_fields_included = var.engine_native_audit_fields_included
depends_on = [aws_rds_cluster_instance.this]
}