How would you reference the volume IDs associated with the ebs_block_device blocks in this configuration?

The correct answer is D. aws_instance.example-ebs_block_device.*.volume_id. To reference attributes across multiple ebs_block_device blocks, Terraform uses the legacy splat expression (.). Option A uses invalid bracket/comma syntax. Option B has a typo (aws_lnstance with a lowercase L) and an extra dot before the brackets (.[]). Option C incorrectly uses

Submitted by diego_uy· Apr 18, 2026Work with Terraform Configurations

Question

How would you reference the volume IDs associated with the ebs_block_device blocks in this configuration?

Options

Aaws_instance.example.ebs_block_device[sda2,sda3).volume_id
Baws_lnstance.example.ebs_block_device.[*].volume_id
Caws_lnstance.example.ebs_block_device.volume_ids
Daws_instance.example-ebs_block_device.*.volume_id

How the community answered

(64 responses)

A
6% (4)
B
3% (2)
C
11% (7)
D
80% (51)

Explanation

To reference attributes across multiple ebs_block_device blocks, Terraform uses the legacy splat expression (.*). Option A uses invalid bracket/comma syntax. Option B has a typo (aws_lnstance with a lowercase L) and an extra dot before the brackets (.[*]). Option C incorrectly uses a plural attribute name volume_ids, which doesn't exist. Option D - aws_instance.example.ebs_block_device.*.volume_id - uses the correct legacy splat operator to iterate over all ebs_block_device blocks and return a list of their volume_id attributes. (Note: the hyphen in choice D appears to be a typographical artifact in the question; the intended syntax is with a dot separator.)

Topics

#Terraform Language#Splat Expression#Resource Attributes#Nested Blocks

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