For_each for map-based instances in Terraform - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use a map with for_each to create instances.

Terraform

resource "aws_instance" "example" {
  for_each = [1]
  ami           = each.value.ami
  instance_type = each.value.instance_type
}

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

Avar.instances

Bvar.instance_list

Caws_instance.example

Dlocal.instances

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list variable instead of a map for for_each.

Referencing a resource instead of a variable.

The for_each argument expects a map or set of strings. Here, var.instances is the map variable holding instance details.

2fill in blank

medium

Complete the code to access the instance type from the map value.

Terraform

instance_type = [1].instance_type

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Avar.instances

Blocal.instance

Ceach.value

Deach.key

Attempts:

3 left

💡 Hint

Common Mistakes

Using each.key which is the map key, not the value.

Using variable names instead of each.

Within a for_each block, each.value accesses the current map value, which contains the instance details.

3fill in blank

hard

Fix the error in the for_each expression to correctly iterate over the map variable.

Terraform

for_each = [1]

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Avar.instances

Bvar.instances[*]

Cvar.instances[]

Dvar.instances.all

Attempts:

3 left

💡 Hint

Common Mistakes

Using list or index syntax on a map variable.

Trying to access a non-existent property like .all.

The for_each expects a map or set of strings. Using var.instances directly is correct. Using var.instances[*] tries to convert to a list, which is invalid here.

4fill in blank

hard

Fill both blanks to create a map of instance names to AMI IDs using for_each.

Terraform

output "instance_amis" {
  value = { for name, details in [1] : name => details.[2] }
}

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Avar.instances

Bvar.instance_list

Cami

Dinstance_type

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list variable instead of a map for iteration.

Accessing the wrong property like instance_type instead of ami.

The for expression iterates over var.instances map. The value accessed is the AMI ID, so details.ami is correct.

5fill in blank

hard

Fill all three blanks to define multiple AWS instances using for_each with map variable and set tags.

Terraform

resource "aws_instance" "web" {
  for_each = [1]
  ami           = each.value.[2]
  instance_type = each.value.instance_type
  tags = {
    Name = [3]
  }
}

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Avar.instances

Bami

Ceach.key

Dlocal.instances

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list variable instead of a map for for_each.

Accessing the wrong property for AMI.

Using a fixed string instead of each.key for the Name tag.

for_each uses the map variable var.instances. The AMI is accessed by each.value.ami. The tag Name uses the map key each.key to name each instance uniquely.