feat: Added database_subnet_group_name variable (#656)

Author: antonbabenko

README.md

@@ -312,6 +312,7 @@ No modules.
 | <a name="input_database_outbound_acl_rules"></a> [database\_outbound\_acl\_rules](#input\_database\_outbound\_acl\_rules) | Database subnets outbound network ACL rules | `list(map(string))` | <pre>[<br>  {<br>    "cidr_block": "0.0.0.0/0",<br>    "from_port": 0,<br>    "protocol": "-1",<br>    "rule_action": "allow",<br>    "rule_number": 100,<br>    "to_port": 0<br>  }<br>]</pre> | no |
 | <a name="input_database_route_table_tags"></a> [database\_route\_table\_tags](#input\_database\_route\_table\_tags) | Additional tags for the database route tables | `map(string)` | `{}` | no |
 | <a name="input_database_subnet_assign_ipv6_address_on_creation"></a> [database\_subnet\_assign\_ipv6\_address\_on\_creation](#input\_database\_subnet\_assign\_ipv6\_address\_on\_creation) | Assign IPv6 address on database subnet, must be disabled to change IPv6 CIDRs. This is the IPv6 equivalent of map\_public\_ip\_on\_launch | `bool` | `null` | no |
+| <a name="input_database_subnet_group_name"></a> [database\_subnet\_group\_name](#input\_database\_subnet\_group\_name) | Name of database subnet group | `string` | `null` | no |
 | <a name="input_database_subnet_group_tags"></a> [database\_subnet\_group\_tags](#input\_database\_subnet\_group\_tags) | Additional tags for the database subnet group | `map(string)` | `{}` | no |
 | <a name="input_database_subnet_ipv6_prefixes"></a> [database\_subnet\_ipv6\_prefixes](#input\_database\_subnet\_ipv6\_prefixes) | Assigns IPv6 database subnet id based on the Amazon provided /56 prefix base 10 integer (0-256). Must be of equal length to the corresponding IPv4 subnet list | `list(string)` | `[]` | no |
 | <a name="input_database_subnet_suffix"></a> [database\_subnet\_suffix](#input\_database\_subnet\_suffix) | Suffix to append to database subnets name | `string` | `"db"` | no |

main.tf

@@ -481,13 +481,13 @@ resource "aws_subnet" "database" {
 resource "aws_db_subnet_group" "database" {
   count = var.create_vpc && length(var.database_subnets) > 0 && var.create_database_subnet_group ? 1 : 0
 
-  name        = lower(var.name)
+  name        = lower(coalesce(var.database_subnet_group_name, var.name))
   description = "Database subnet group for ${var.name}"
   subnet_ids  = aws_subnet.database.*.id
 
   tags = merge(
     {
-      "Name" = format("%s", var.name)
+      "Name" = format("%s", lower(coalesce(var.database_subnet_group_name, var.name)))
     },
     var.tags,
     var.database_subnet_group_tags,

variables.tf

@@ -478,6 +478,12 @@ variable "intra_route_table_tags" {
   default     = {}
 }
 
+variable "database_subnet_group_name" {
+  description = "Name of database subnet group"
+  type        = string
+  default     = null
+}
+
 variable "database_subnet_tags" {
   description = "Additional tags for the database subnets"
   type        = map(string)