Add support for custom resource names

README.md

@@ -53,35 +53,39 @@ No requirements.
 
 ## Inputs
 
-| Name | Description | Type | Default | Required |
-|------|-------------|------|---------|:--------:|
-| allowed\_cidr | A list CIDRs to allow access to. | `list(string)` | <pre>[<br>  "127.0.0.1/32"<br>]</pre> | no |
-| allowed\_security\_groups | A list of Security Group ID's to allow access to. | `list(string)` | `[]` | no |
-| apply\_immediately | Specifies whether any modifications are applied immediately, or during the next maintenance window. Default is false. | `bool` | `false` | no |
-| at\_rest\_encryption\_enabled | Whether to enable encryption at rest | `bool` | `false` | no |
-| auth\_token | The password used to access a password protected server. Can be specified only if transit\_encryption\_enabled = true. If specified must contain from 16 to 128 alphanumeric characters or symbols | `string` | `null` | no |
-| auto\_minor\_version\_upgrade | Specifies whether a minor engine upgrades will be applied automatically to the underlying Cache Cluster instances during the maintenance window | `bool` | `true` | no |
-| availability\_zones | A list of EC2 availability zones in which the replication group's cache clusters will be created. The order of the availability zones in the list is not important | `list(string)` | `[]` | no |
-| env | env to deploy into, should typically dev/staging/prod | `string` | n/a | yes |
-| kms\_key\_id | The ARN of the key that you wish to use if encrypting at rest. If not supplied, uses service managed encryption. Can be specified only if at\_rest\_encryption\_enabled = true | `string` | `""` | no |
-| name | Name for the Redis replication group i.e. UserObject | `string` | n/a | yes |
-| notification\_topic\_arn | An Amazon Resource Name (ARN) of an SNS topic to send ElastiCache notifications to. Example: arn:aws:sns:us-east-1:012345678999:my\_sns\_topic | `string` | `""` | no |
-| redis\_clusters | Number of Redis cache clusters (nodes) to create | `string` | n/a | yes |
-| redis\_failover | n/a | `bool` | `false` | no |
-| redis\_maintenance\_window | Specifies the weekly time range for when maintenance on the cache cluster is performed. The format is ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60 minute period | `string` | `"fri:08:00-fri:09:00"` | no |
-| redis\_node\_type | Instance type to use for creating the Redis cache clusters | `string` | `"cache.m3.medium"` | no |
-| redis\_parameters | additional parameters modifyed in parameter group | `list(map(any))` | `[]` | no |
-| redis\_port | n/a | `number` | `6379` | no |
+| Name                              | Description | Type | Default | Required |
+|-----------------------------------|-------------|------|----|:--------:|
+| allowed\_cidr                     | A list CIDRs to allow access to. | `list(string)` | <pre>[<br>  "127.0.0.1/32"<br>]</pre> | no |
+| allowed\_security\_groups         | A list of Security Group ID's to allow access to. | `list(string)` | `[]` | no |
+| apply\_immediately                | Specifies whether any modifications are applied immediately, or during the next maintenance window. Default is false. | `bool` | `false` | no |
+| at\_rest\_encryption\_enabled     | Whether to enable encryption at rest | `bool` | `false` | no |
+| auth\_token                       | The password used to access a password protected server. Can be specified only if transit\_encryption\_enabled = true. If specified must contain from 16 to 128 alphanumeric characters or symbols | `string` | `null` | no |
+| auto\_minor\_version\_upgrade     | Specifies whether a minor engine upgrades will be applied automatically to the underlying Cache Cluster instances during the maintenance window | `bool` | `true` | no |
+| availability\_zones               | A list of EC2 availability zones in which the replication group's cache clusters will be created. The order of the availability zones in the list is not important | `list(string)` | `[]` | no |
+| elasticache_parameter_group_name  | Name of the ElastiCache parameter group | `string` | `""` | no |
+| elasticache_replication_group_id  | Name of the ElastiCache replication group | `string` | `""` | no |
+| elasticache_security_group_name   | Name of the ElastiCache security group | `string` | `""` | no |
+| elasticache_subnet_group_name     | Name of the ElastiCache subnet group | `string` | `""` | no |
+| env                               | env to deploy into, should typically dev/staging/prod | `string` | n/a | yes |
+| kms\_key\_id                      | The ARN of the key that you wish to use if encrypting at rest. If not supplied, uses service managed encryption. Can be specified only if at\_rest\_encryption\_enabled = true | `string` | `""` | no |
+| name                              | Name for the Redis replication group i.e. UserObject | `string` | n/a | yes |
+| notification\_topic\_arn          | An Amazon Resource Name (ARN) of an SNS topic to send ElastiCache notifications to. Example: arn:aws:sns:us-east-1:012345678999:my\_sns\_topic | `string` | `""` | no |
+| redis\_clusters                   | Number of Redis cache clusters (nodes) to create | `string` | n/a | yes |
+| redis\_failover                   | n/a | `bool` | `false` | no |
+| redis\_maintenance\_window        | Specifies the weekly time range for when maintenance on the cache cluster is performed. The format is ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60 minute period | `string` | `"fri:08:00-fri:09:00"` | no |
+| redis\_node\_type                 | Instance type to use for creating the Redis cache clusters | `string` | `"cache.m3.medium"` | no |
+| redis\_parameters                 | additional parameters modifyed in parameter group | `list(map(any))` | `[]` | no |
+| redis\_port                       | n/a | `number` | `6379` | no |
 | redis\_snapshot\_retention\_limit | The number of days for which ElastiCache will retain automatic cache cluster snapshots before deleting them. For example, if you set SnapshotRetentionLimit to 5, then a snapshot that was taken today will be retained for 5 days before being deleted. If the value of SnapshotRetentionLimit is set to zero (0), backups are turned off. Please note that setting a snapshot\_retention\_limit is not supported on cache.t1.micro or cache.t2.\* cache nodes | `number` | `0` | no |
-| redis\_snapshot\_window | The daily time range (in UTC) during which ElastiCache will begin taking a daily snapshot of your cache cluster. The minimum snapshot window is a 60 minute period | `string` | `"06:30-07:30"` | no |
-| redis\_version | Redis version to use, defaults to 3.2.10 | `string` | `"3.2.10"` | no |
-| security\_group\_names | A list of cache security group names to associate with this replication group | `list(string)` | `[]` | no |
-| snapshot\_arns | A single-element string list containing an Amazon Resource Name (ARN) of a Redis RDB snapshot file stored in Amazon S3. Example: arn:aws:s3:::my\_bucket/snapshot1.rdb | `list(string)` | `[]` | no |
-| snapshot\_name | The name of a snapshot from which to restore data into the new node group. Changing the snapshot\_name forces a new resource | `string` | `""` | no |
-| subnets | List of VPC Subnet IDs for the cache subnet group | `list(string)` | n/a | yes |
-| tags | Tags for redis nodes | `map(string)` | `{}` | no |
-| transit\_encryption\_enabled | Whether to enable encryption in transit. Requires 3.2.6 or >=4.0 redis\_version | `bool` | `false` | no |
-| vpc\_id | VPC ID | `string` | n/a | yes |
+| redis\_snapshot\_window           | The daily time range (in UTC) during which ElastiCache will begin taking a daily snapshot of your cache cluster. The minimum snapshot window is a 60 minute period | `string` | `"06:30-07:30"` | no |
+| redis\_version                    | Redis version to use, defaults to 3.2.10 | `string` | `"3.2.10"` | no |
+| security\_group\_names            | A list of cache security group names to associate with this replication group | `list(string)` | `[]` | no |
+| snapshot\_arns                    | A single-element string list containing an Amazon Resource Name (ARN) of a Redis RDB snapshot file stored in Amazon S3. Example: arn:aws:s3:::my\_bucket/snapshot1.rdb | `list(string)` | `[]` | no |
+| snapshot\_name                    | The name of a snapshot from which to restore data into the new node group. Changing the snapshot\_name forces a new resource | `string` | `""` | no |
+| subnets                           | List of VPC Subnet IDs for the cache subnet group | `list(string)` | n/a | yes |
+| tags                              | Tags for redis nodes | `map(string)` | `{}` | no |
+| transit\_encryption\_enabled      | Whether to enable encryption in transit. Requires 3.2.6 or >=4.0 redis\_version | `bool` | `false` | no |
+| vpc\_id                           | VPC ID | `string` | n/a | yes |
 
 ## Outputs
 

main.tf

@@ -14,7 +14,7 @@ resource "random_id" "salt" {
 }
 
 resource "aws_elasticache_replication_group" "redis" {
-  replication_group_id          = format("%.20s", "${var.name}-${var.env}")
+  replication_group_id          = var.elasticache_replication_group_id == "" ? format("%.20s", "${var.name}-${var.env}") : var.elasticache_replication_group_id
   replication_group_description = "Terraform-managed ElastiCache replication group for ${var.name}-${var.env}-${local.vpc_name}"
   number_cache_clusters         = var.redis_clusters
   node_type                     = var.redis_node_type
@@ -44,7 +44,7 @@ resource "aws_elasticache_replication_group" "redis" {
 }
 
 resource "aws_elasticache_parameter_group" "redis_parameter_group" {
-  name = replace(format("%.255s", lower(replace("tf-redis-${var.name}-${var.env}-${local.vpc_name}-${random_id.salt.hex}", "_", "-"))), "/\\s/", "-")
+  name = var.elasticache_parameter_group_name == "" ? replace(format("%.255s", lower(replace("tf-redis-${var.name}-${var.env}-${local.vpc_name}-${random_id.salt.hex}", "_", "-"))), "/\\s/", "-") : var.elasticache_parameter_group_name
 
   description = "Terraform-managed ElastiCache parameter group for ${var.name}-${var.env}-${local.vpc_name}"
 
@@ -64,6 +64,6 @@ resource "aws_elasticache_parameter_group" "redis_parameter_group" {
 }
 
 resource "aws_elasticache_subnet_group" "redis_subnet_group" {
-  name       = replace(format("%.255s", lower(replace("tf-redis-${var.name}-${var.env}-${local.vpc_name}", "_", "-"))), "/\\s/", "-")
+  name       = var.elasticache_subnet_group_name == "" ? replace(format("%.255s", lower(replace("tf-redis-${var.name}-${var.env}-${local.vpc_name}", "_", "-"))), "/\\s/", "-") : var.elasticache_subnet_group_name
   subnet_ids = var.subnets
 }

security_groups.tf

@@ -1,5 +1,6 @@
+
 resource "aws_security_group" "redis_security_group" {
-  name        = format("%.255s", "tf-sg-ec-${var.name}-${var.env}-${local.vpc_name}")
+  name        = var.elasticache_security_group_name == "" ? format("%.255s", "tf-sg-ec-${var.name}-${var.env}-${local.vpc_name}") : var.elasticache_security_group_name
   description = "Terraform-managed ElastiCache security group for ${var.name}-${var.env}-${local.vpc_name}"
   vpc_id      = data.aws_vpc.vpc.id
 

variables.tf

@@ -174,3 +174,27 @@ variable "notification_topic_arn" {
   type        = string
   default     = ""
 }
+
+variable "elasticache_replication_group_id" {
+  description = "Name of the ElastiCache replication group"
+  type        = string
+  default     = ""
+}
+
+variable "elasticache_parameter_group_name" {
+  description = "Name of the ElastiCache parameter group"
+  type        = string
+  default     = ""
+}
+
+variable "elasticache_subnet_group_name" {
+  description = "Name of the ElastiCache subnet group"
+  type        = string
+  default     = ""
+}
+
+variable "elasticache_security_group_name" {
+  description = "Name of the ElastiCache security group"
+  type        = string
+  default     = ""
+}