Adds dns_subdomain variable to override subdomain (#58)

* Adds dns_subdomain variable to override subdomain

* Adds dns_subdomain var to README

* Updated README.md

Co-authored-by: Maxim Mironenko <simixido@gmail.com>
Co-authored-by: actions-bot <58130806+actions-bot@users.noreply.github.com>

README.md

@@ -184,6 +184,7 @@ Available targets:
 | cluster_mode_replicas_per_node_group | Number of replica nodes in each node group. Valid values are 0 to 5. Changing this number will force a new resource | number | `0` | no |
 | cluster_size | Number of nodes in cluster. *Ignored when `cluster_mode_enabled` == `true`* | number | `1` | no |
 | delimiter | Delimiter between `name`, `namespace`, `stage` and `attributes` | string | `-` | no |
+| dns_subdomain | The subdomain to use for the CNAME record. If not provided then the CNAME record will use var.name. | string | `` | no |
 | elasticache_subnet_group_name | Subnet group name for the ElastiCache instance | string | `` | no |
 | enabled | Set to false to prevent the module from creating any resources | bool | `true` | no |
 | engine_version | Redis engine version | string | `4.0.10` | no |

docs/terraform.md

@@ -18,6 +18,7 @@
 | cluster_mode_replicas_per_node_group | Number of replica nodes in each node group. Valid values are 0 to 5. Changing this number will force a new resource | number | `0` | no |
 | cluster_size | Number of nodes in cluster. *Ignored when `cluster_mode_enabled` == `true`* | number | `1` | no |
 | delimiter | Delimiter between `name`, `namespace`, `stage` and `attributes` | string | `-` | no |
+| dns_subdomain | The subdomain to use for the CNAME record. If not provided then the CNAME record will use var.name. | string | `` | no |
 | elasticache_subnet_group_name | Subnet group name for the ElastiCache instance | string | `` | no |
 | enabled | Set to false to prevent the module from creating any resources | bool | `true` | no |
 | engine_version | Redis engine version | string | `4.0.10` | no |

main.tf

@@ -162,7 +162,7 @@ resource "aws_cloudwatch_metric_alarm" "cache_memory" {
 module "dns" {
   source  = "git::https://github.com/cloudposse/terraform-aws-route53-cluster-hostname.git?ref=tags/0.3.0"
   enabled = var.enabled && var.zone_id != "" ? true : false
-  name    = var.name
+  name    = var.dns_subdomain != "" ? var.dns_subdomain : var.name
   ttl     = 60
   zone_id = var.zone_id
   records = var.cluster_mode_enabled ? [join("", aws_elasticache_replication_group.default.*.configuration_endpoint_address)] : [join("", aws_elasticache_replication_group.default.*.primary_endpoint_address)]

variables.tf

@@ -174,6 +174,12 @@ variable "zone_id" {
   description = "Route53 DNS Zone ID"
 }
 
+variable "dns_subdomain" {
+  type        = string
+  default     = ""
+  description = "The subdomain to use for the CNAME record. If not provided then the CNAME record will use var.name."
+}
+
 variable "delimiter" {
   type        = string
   default     = "-"