Terraform import volumes assigned to instances list

[Asier Gomez]

I have configured a resource for instances list:

resource "aws_instance" "masters" {
    count = "${var.masters_count}"
    ami = "${var.aws_centos_ami}"
    instance_type = "t2.micro"
    key_name = "${var.aws_key_name}"
    vpc_security_group_ids = ["${aws_security_group.bastion.id}"]
    associate_public_ip_address = true
    source_dest_check = false
    subnet_id = "${aws_subnet.eu-west-1b-public.id}"

    availability_zone = "eu-west-1b"

    tags {
            Name = "master-${count.index}"
        }
}

Then I attach volumes to that instances:

data "aws_ebs_volume" "masters_ebs_volume" {
    count = "${var.masters_count}"
    filter {
      name   = "attachment.instance-id"
      values = ["${element(aws_instance.masters.*.id, count.index)}"]
    }
}

Now I am trying to import the volumes to terraform. I just try using:

terraform import aws_ebs_volume.data[0] vol-1153438514541
terraform import aws_ebs_volume.masters_ebs_volume[0] vol-1153438514541
terraform import aws_ebs_volume.masters[0] vol-1153438514541
terraform import aws_ebs_volume.data vol-1153438514541
terraform import aws_ebs_volume.masters vol-1153438514541



But nothing works.. how can I import that volumes?

[Stephen Eilert]

Hi,

data "aws_ebs_volume" "masters_ebs_volume" {
    count = "${var.masters_count}"
    filter {
      name   = "attachment.instance-id"
      values = ["${element(aws_instance.masters.*.id, count.index)}"]
    }
}

You are not attaching the volumes, this is only retrieving data about your instance volumes. What you are looking for is "aws_volume_attachment", here: https://www.terraform.io/docs/providers/aws/r/volume_attachment.html 

Anything under "data" is a data source, for retrieving information only.

Thanks,

— Stephen

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[Asier Gomez]

Hello,

Really thanks, but what I want is to import the volumes of the AWS instances, which data I can have the information when it is only one volume and one instance.
If I use https://www.terraform.io/docs/providers/aws/r/volume_attachment.html how can I attach one volume per instance, when I am using a list of instances with   count = "${var.masters_count}"?

Thanks!

[Lowe Schmidt]

You can't get the EBS root volume data out of an instance (see the attributes reference here https://www.terraform.io/docs/providers/aws/r/instance.html#attributes-reference )

What you can do, is modify the root volume with this https://www.terraform.io/docs/providers/aws/r/instance.html#root_block_device and this https://www.terraform.io/docs/providers/aws/r/instance.html#block-devices when you create your instances.

If you want to attach a secondary EBS volume to the instance, you need to create an EBS volume in terraform and then attach it to the instance as described previously. 

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Lowe Schmidt | +46 723 867 157

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[Asier Gomez]

Really thanks,

I only want one volume per instance, but if the volume change outside Terraform, the delete-on-termination works?

[Asier Gomez]

Thanks!! It works with the delete_on_terminaton = true, I thought  that only works if the volume doesn't change externally, but it works too.
So really thanks

El lunes, 12 de febrero de 2018, 14:40:43 (UTC+1), Lowe Schmidt escribió: