EBS block device recreates at every 'apply'

[Andrew Langhorn]

Hi,

I'm specifying an EBS block device as part of an EC2 instance. It is set to delete on termination. When I run 'terraform plan', I'm told that Terraform wants to recreate the entire resource since a new EBS volume forces recreation of the instance. If the instance already exists and is working, does anyone know why Terraform wants to recreate the volume/instance?

Thanks,

--

Andrew Langhorn
Senior Infrastructure Engineer
Email	andrew....@thoughtworks.com
Telephone	+44 7733 339809

[Joshua Garnett]

Hi Andrew,

Is there any chance you are attempting to use the EBS block device as the root volume?  I was originally using ebs_block_device instead of root_block_device and noticed a similar problem to what you are experiencing.

For an existing instance that is already running, you should instead use the aws_ebs_volume and aws_volume_attachment resources, which will create a volume that isn't explicitly attached to the instance.

--Josh

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[Andrew Langhorn]

Hi Josh,

For $reasons, I have a new EBS device mapped to /dev/sdg, which I'm attaching using ebs_block_device. The root block device is still managed by AWS, and I'm not touching that in Terraform.

I'll have a look at aws_ebs_volume and aws_volume_attachment, because they sound more along the lines of what I want to do.

Thanks,

Andrew

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[ja...@fpcomplete.com]

On Monday, December 14, 2015 at 12:17:18 PM UTC-5, Andrew Langhorn wrote:

Hi Josh,

For $reasons, I have a new EBS device mapped to /dev/sdg, which I'm attaching using ebs_block_device. The root block device is still managed by AWS, and I'm not touching that in Terraform.

I'll have a look at aws_ebs_volume and aws_volume_attachment, because they sound more along the lines of what I want to do.

I'd love to hear how this works out for you, I ran into issues using it and have not had the time to return to this and figure out the correct flow.