How does Terraform determine dependencies between resources?

The correct answer is A. Terraform automatically builds a resource graph based on resources, provisioners, special meta-. Terraform automatically constructs a dependency graph by inspecting references between resources in your configuration. When one resource references an attribute of another (e.g., aws_subnet.id used in an EC2 instance), Terraform infers that the subnet must be created first. It…

Understand Terraform basics

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Options

ATerraform automatically builds a resource graph based on resources, provisioners, special meta-
BTerraform requires all dependencies between resources to be specified using the depends_on
CTerraform requires resources in a configuration to be listed in the order they will be created to
DTerraform requires resource dependencies to be defined as modules and sourced in order

How the community answered

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A
91% (21)
B
4% (1)
C
4% (1)

Explanation

Terraform automatically constructs a dependency graph by inspecting references between resources in your configuration. When one resource references an attribute of another (e.g., aws_subnet.id used in an EC2 instance), Terraform infers that the subnet must be created first. It also accounts for provisioners and the special depends_on meta-argument for cases where implicit references don't exist. You do NOT need to list resources in order or define all dependencies manually - Terraform's graph engine handles this automatically, enabling parallel creation of independent resources.

Topics

#Dependency resolution#Resource graph#Implicit dependencies#Terraform core concepts

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