Terraform Configuration Files and Overrides Quiz
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Questions and Answers

What command is used to generate a plan file in Terraform?

  • terraform create -out filename
  • terraform plan -out filename (correct)
  • terraform generate -out filename
  • terraform execute -out filename

    • Where is the location of the AWS Config file that Terraform accesses for credentials on MacOS and Linux?

  • ~/.aws/aws.conf
  • ~/.aws/credentials (correct)
  • ~/.aws/auth
  • ~/.aws/config

    • What is the purpose of the terraform.tfstate file in Terraform?

  • Maintains Terraform configurations
  • Tracks the IDs of created resources (correct)
  • Stores sensitive credentials
  • Keeps track of provider binaries

    • Which attribute is used in Terraform to create explicit dependencies between resources?

    <p>depends_on</p> Signup and view all the answers

    What is the primary purpose of Terraform's terraform show command?

    <p>Display the current state</p> Signup and view all the answers

    In Terraform, what is the significance of using implicit dependencies via interpolation expressions?

    <p>Inform Terraform about resource relationships</p> Signup and view all the answers

    What is the special handling of override files in Terraform?

    <p>Terraform processes override files in lexicographical order</p> Signup and view all the answers

    When does Terraform automatically load files terraform.tfvars or *.auto.tfvars?

    <p>When present in the current directory</p> Signup and view all the answers

    What is the purpose of a.tfvars file in Terraform?

    <p>Assign values to already declared variables</p> Signup and view all the answers

    Which command is used to preview the changes without altering the backend state?

    <p>terraform plan</p> Signup and view all the answers

    What does Terraform search for in its own process environment for variable values?

    <p>Environment variables with TF_VAR_ prefix</p> Signup and view all the answers

    What happens when override files are over-used in Terraform?

    <p>Hurts readability</p> Signup and view all the answers

    Study Notes

    Terraform Fundamentals

    • Terraform configuration files are often called configuration files.
    • Terraform loads all files ending in .tf in a directory.

    Terraform Plan

    • terraform plan -out filename generates a plan file, which is a zip file.
    • The plan file can be used when applying: terraform apply "nat.tfplan".

    Terraform Validate

    • terraform validate validates the syntax.

    Terraform Plan Options

    • terraform plan [-destroy] generates an execution plan for Terraform.

    Provider Configuration

    • The profile attribute refers to the AWS Config File in ~/.aws/credentials on MacOS and Linux or %UserProfile%\.aws\credentials on a Windows system.
    • It is recommended not to hardcode credentials into .tf configuration files.
    • The provider "aws" block defines the default AWS config profile and region.

    Resource Blocks

    • A resource block has two strings before opening the block: the resource type and the resource name.
    • Each "Provider" is its own encapsulated binary distributed separately from Terraform itself.
    • The terraform init command will automatically download and install any Provider binary for the providers in use within the configuration.

    Terraform State

    • Terraform writes data into the terraform.tfstate file, which keeps track of the IDs of created resources.
    • This state file is extremely important and must be saved and distributed to anyone who might run Terraform.
    • terraform show can be used to inspect the current state.

    Resource Dependencies

    • Implicit dependencies via interpolation expressions are the primary way to inform Terraform about relationships.
    • The depends_on argument is accepted by any resource and accepts a list of resources to create explicit dependencies.

    Override Files

    • Terraform has special handling of any configuration file whose name ends in _override.tf or _override.tf.json.
    • Override files are processed in lexicographical order after the initial configuration file.
    • Use override files only in special circumstances, as over-use hurts readability.

    Variable Definitions

    • Terraform searches the environment of its own process for environment variables named TF_VAR_ followed by the name of a declared variable.
    • Terraform automatically loads .tfvars or *.auto.tfvars files present in the current directory to populate variables.
    • A .tfvars file is used to assign values to variables, not to declare new variables.

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    Description

    Test your knowledge on Terraform configuration files and overrides. Learn about how Terraform handles files with names ending in _override.tf or _override.tf.json, and how these files are processed in lexicographical order.

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