When an output from a data source is used in counts, in some cases Terraform can't compute the counts throwing the errors (it's working in the Terratest, but does not work for some customers):
Error: Invalid count argument
on .terraform/modules/search_service_elasticsearch_master.elasticsearch/main.tf line 76, in resource "aws_iam_service_linked_role" "default":
76: count = var.enabled && var.create_iam_service_linked_role && length(data.aws_iam_role.default.*.id) == 0 ? 1 : 0
The "count" value depends on resource attributes that cannot be determined
until apply, so Terraform cannot predict how many instances will be created.
To work around this, use the -target argument to first apply only the
resources that the count depends on.
We have a bool variable create_iam_service_linked_role to control that without using data sources. If the AWS account (where the module is provisioned) already has the AWSServiceRoleForAmazonElasticsearchService service role, set the variable create_iam_service_linked_role to false. On a new account, set it to true
what
countfor resourceswhy
counts, in some cases Terraform can't compute the counts throwing the errors (it's working in the Terratest, but does not work for some customers):create_iam_service_linked_roleto control that without using data sources. If the AWS account (where the module is provisioned) already has theAWSServiceRoleForAmazonElasticsearchServiceservice role, set the variablecreate_iam_service_linked_roletofalse. On a new account, set it totrue