Input variable precedence order in Terraform - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a variable with a default value.

Terraform

variable "region" {
  type    = string
  default = "[1]"
}

Drag options to blanks, or click blank then click option'

A10

Btrue

Cus-west-2

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using a boolean or number instead of a region string.

Leaving the default value empty.

The default value for the variable region is set to us-west-2.

2fill in blank

medium

Complete the code to override the variable value using a CLI flag.

Terraform

terraform apply -var='region=[1]'

Drag options to blanks, or click blank then click option'

Aeu-central-1

Bdefault

Cfalse

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'default' as a value which is not a valid region.

Using boolean or null values.

The CLI flag -var='region=eu-central-1' overrides the default variable value.

3fill in blank

hard

Fix the error in the variable declaration to set a description.

Terraform

variable "environment" {
  type        = string
  description = [1]
  default     = "dev"
}

Drag options to blanks, or click blank then click option'

Anull

B"The deployment environment"

Ctrue

Ddev

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the description string.

Using a boolean or null instead of a string.

The description must be a quoted string explaining the variable purpose.

4fill in blank

hard

Fill both blanks to set a variable with a type and a default list value.

Terraform

variable "availability_zones" {
  type    = [1]
  default = [2]
}

Drag options to blanks, or click blank then click option'

Alist(string)

B["us-west-2a", "us-west-2b"]

Cstring

D"us-west-2a"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single string type instead of a list.

Setting default as a single string instead of a list.

The variable type is a list of strings, and the default is a list of availability zones.

5fill in blank

hard

Fill all three blanks to demonstrate variable precedence: default, environment variable, and CLI override.

Terraform

# Variable with default
variable "instance_type" {
  type    = string
  default = "t2.micro"
}

# Environment variable override example
# export TF_VAR_instance_type=[1]

# CLI override example
terraform apply -var='instance_type=[2]'

# Final value used is [3]

Drag options to blanks, or click blank then click option'

At2.small

Bt2.medium

Dt2.micro

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the precedence order of variable sources.

Using the default as the final value when overrides exist.

The default is t2.micro. The environment variable sets t2.small. The CLI override sets t2.medium. CLI override has highest precedence, so final value is t2.medium.