Cross region replication of AWS ECR repository

Question

I am trying to replicate my AWS ECR repository to multiple regions within the same account using terraform. I tried manually from the AWS console it works fine but from terraform, I am not able to find the solution. What I tried: I tried to make a separate variable for the region called replicate_region and tried to provide the region in the list but it keeps on giving me an error called

Inappropriate value for attribute "region": string required.

Here is the variable code:

variable "replicate_region" {
 description = "value"
 type = list(string)
}

Here is my code for ecr replication:

resource "aws_ecr_replication_configuration" "replication" {
 replication_configuration {
  rule {
   destination {
     region      = var.replicate_region
     registry_id = "xxxxxxxx"
  }
}}}

Can anyone please help me out?

Thanks,

Answer 1

Your replicate_region should be string, not a list of strings. It should be, e.g.:

variable "replicate_region" {
 description = "value"
 type = string
 default = "us-east-1"
}

Update

Iteration using dynamic block.

variable "replicate_region" {
 description = "value"
 type = list(string)
 default = ["us-east-1", "ap-southeast-1", "ap-south-1"]
}

resource "aws_ecr_replication_configuration" "replication" {

 replication_configuration {
  rule {

   dynamic "destination" {

       for_each = toset(var.replicate_region) 

       content {
         region      = destination.key
         registry_id = "xxxxxxxx"
      }
  }
}}}