Create snapshots of multiple EBS volumes using Terraform - amazon-web-services

Question

I am trying to create snapshots of certain EBS volumes based on tags in a particular AWS region using Terraform.
I have tried filtering EBS volumes based on Tags. I can get a clear output of EBS volume id when only one tag value is specified in the filter attribute but for more than one values, i get the following error:
data.aws_ebs_volume.ebs_volume: data.aws_ebs_volume.ebs_volume: Your
query returned more than one result. Please try a more specific search
criteria, or set most_recent attribute to true.
Below is my terraform template:
data "aws_ebs_volume" "ebs_volume" {
filter {
name = "tag:Name"
values = ["EBS1","EBS2","EBS3"]
}
}
output "ebs_volume_id" {
value = "${data.aws_ebs_volume.ebs_volume.id}"
}
resource "aws_ebs_snapshot" "ebs_volume" {
volume_id = "${data.aws_ebs_volume.ebs_volume.id}"
}
Is there a clear way to create snapshots of multiple EBS volumes using any kind of looping statement in terraform?

Answer 1

You can use the count meta parameter to loop over lists, creating multiple resources or data sources.
In your case you could do something like this:
variable "ebs_volumes" {
default = [
"EBS1",
"EBS2",
"EBS3",
]
}
data "aws_ebs_volume" "ebs_volume" {
count = "${length(var.ebs_volumes)}"
filter {
name = "tag:Name"
values = ["${var.ebs_volumes[count.index]}"]
}
}
output "ebs_volume_ids" {
value = ["${data.aws_ebs_volume.ebs_volume.*.id}"]
}
resource "aws_ebs_snapshot" "ebs_volume" {
count = "${length(var.ebs_volumes)}"
volume_id = "${data.aws_ebs_volume.ebs_volume.*.id[count.index]}"
}