Count for multiple instances in Terraform - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create multiple instances using count.

Terraform

resource "aws_instance" "example" {
  ami           = "ami-12345678"
  instance_type = "t2.micro"
  count         = [1]
}

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

A3

B1

C0

D"3"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a number for count.

Setting count to 0 which creates no instances.

The count argument expects a number to specify how many instances to create. Using 3 creates three instances.

2fill in blank

medium

Complete the code to reference the ID of the second instance created using count.

Terraform

output "second_instance_id" {
  value = aws_instance.example[[1]].id
}

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A1

B2

C0

D"1"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 instead of 1 for the second instance index.

Using a string index instead of a number.

Terraform uses zero-based indexing. The second instance is at index 1.

3fill in blank

hard

Fix the error in the count expression to create instances based on a variable.

Terraform

variable "instance_count" {
  type    = number
  default = 2
}

resource "aws_instance" "example" {
  ami           = "ami-12345678"
  instance_type = "t2.micro"
  count         = [1]
}

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

Ainstance_count

Bvar.instance_count

Cvar["instance_count"]

D"var.instance_count"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the variable name without var. prefix.

Using quotes around the variable reference.

To use a variable in Terraform, prefix it with var.. So var.instance_count correctly references the variable.

4fill in blank

hard

Fill both blanks to create instances with different names using count and the index.

Terraform

resource "aws_instance" "example" {
  ami           = "ami-12345678"
  instance_type = "t2.micro"
  count         = 3
  tags = {
    Name = "example-$[1]"
    Env  = "$[2]"
  }
}

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Acount.index

Bvar.environment

Ccount_index

Denvironment

Attempts:

3 left

💡 Hint

Common Mistakes

Using count_index instead of count.index.

Not using var. prefix for variables.

count.index gives the current instance number starting at 0, used to create unique names. var.environment references a variable for environment tagging.

5fill in blank

hard

Fill all three blanks to create a map of instance IDs keyed by their index using count.

Terraform

output "instance_ids_map" {
  value = { for i in range([1]) : i => aws_instance.example[[2]].id if i [3] 0 }
}

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

Avar.instance_count

Bi

C>

Dcount.index

Attempts:

3 left

💡 Hint

Common Mistakes

Using count.index instead of i inside the loop.

Using < instead of > in the condition.

range(var.instance_count) loops over the number of instances. i is the index used to access each instance. The condition i > 0 filters out the first instance.