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

The correct answer is A. aws_instance.example.ebs_block_device.[*].volume_id. Because ebs_block_device is a block that can appear multiple times in a single aws_instance resource, it forms a set of objects. To retrieve an attribute across all instances of a repeated block, you use a splat expression with []…

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Question

Exhibit

Options

Aaws_instance.example.ebs_block_device.[*].volume_id
Baws_instance.example.ebs_block_device.volume_id
Caws_instance.example.ebs_block_device[sda2,sda3].volume_id
Daws_instance.example.ebs_block_device.*.volume_id

How the community answered

(28 responses)

A
79% (22)
B
4% (1)
C
14% (4)
D
4% (1)

Explanation

Because ebs_block_device is a block that can appear multiple times in a single aws_instance resource, it forms a set of objects. To retrieve an attribute across all instances of a repeated block, you use a splat expression with [*]: aws_instance.example.ebs_block_device.[*].volume_id. This returns a list of all volume IDs from all ebs_block_device blocks. The legacy splat syntax .* also works but [*] is the modern, preferred form. Options B and C are syntactically invalid for this use case. Answer A is correct.

Topics

#Terraform HCL Syntax#Referencing Attributes#Splat Operator#Nested Blocks

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