Add support for availability_zones parameter (#11)

Author: marcincuber

.pre-commit-config.yaml

@@ -18,7 +18,7 @@ repos:
     args: ['--allow-missing-credentials']
   - id: trailing-whitespace
 - repo: git://github.com/antonbabenko/pre-commit-terraform
-  rev: v1.44.0
+  rev: v1.45.0
   hooks:
   - id: terraform_fmt
   - id: terraform_docs

README.md

@@ -89,6 +89,7 @@ Module managed by [Marcin Cuber](https://github.com/marcincuber) [linkedin](http
 | auth\_token | The password used to access a password protected server. Can be specified only if `transit_encryption_enabled = true`. | `string` | `""` | no |
 | auto\_minor\_version\_upgrade | n/a | `string` | `true` | no |
 | automatic\_failover\_enabled | Specifies whether a read-only replica will be automatically promoted to read/write primary if the existing primary fails. | `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)` | `null` | no |
 | cluster\_mode\_enabled | Enable creation of a native redis cluster. | `bool` | `false` | no |
 | description | The description of the all resources. | `string` | `"Managed by Terraform"` | no |
 | engine\_version | The version number of the cache engine to be used for the cache clusters in this replication group. | `string` | `"5.0.6"` | no |

main.tf

@@ -5,6 +5,7 @@ resource "aws_elasticache_replication_group" "redis" {
   subnet_group_name    = aws_elasticache_subnet_group.redis.name
   security_group_ids   = concat(var.security_group_ids, [aws_security_group.redis.id])
 
+  availability_zones    = var.availability_zones
   replication_group_id  = "${var.name_prefix}-redis"
   number_cache_clusters = var.cluster_mode_enabled ? null : var.number_cache_clusters
   node_type             = var.node_type

variables.tf

@@ -162,3 +162,9 @@ variable "num_node_groups" {
   default     = 0
   description = "Required when `cluster_mode_enabled` is set to true. Specify the number of node groups (shards) for this Redis replication group. Changing this number will trigger an online resizing operation before other settings modifications."
 }
+
+variable "availability_zones" {
+  type        = list(string)
+  description = "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."
+  default     = null
+}