Depends_on for explicit dependencies in Terraform - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add an explicit dependency on the resource 'aws_vpc.main'.

Terraform

resource "aws_subnet" "example" {
  vpc_id = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"
  [1] = [aws_vpc.main]
}

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Aprovider

Bdepends_on

Clifecycle

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'provider' instead of 'depends_on'.

Forgetting to wrap the resource in a list.

The depends_on argument explicitly declares a dependency on another resource, ensuring Terraform creates the dependent resource first.

2fill in blank

medium

Complete the code to explicitly depend on both 'aws_vpc.main' and 'aws_internet_gateway.gw'.

Terraform

resource "aws_route_table" "rt" {
  vpc_id = aws_vpc.main.id
  [1] = [aws_vpc.main, aws_internet_gateway.gw]
}

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Acount

Bprovider

Cdepends_on

Dlifecycle

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'count' or 'provider' instead of 'depends_on'.

Not using a list for multiple dependencies.

The depends_on argument can list multiple resources to ensure they are created before this resource.

3fill in blank

hard

Fix the error in the code by correctly specifying the explicit dependency on 'aws_security_group.sg'.

Terraform

resource "aws_instance" "web" {
  ami           = "ami-123456"
  instance_type = "t2.micro"
  [1] = [aws_security_group.sg]
}

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Adepends_on

Bdepends

Cdependency

DdependsOn

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase or incorrect spellings like 'dependsOn' or 'dependency'.

Omitting the list brackets around the resource.

The correct meta-argument is depends_on. Other variants are invalid and cause errors.

4fill in blank

hard

Fill both blanks to explicitly depend on 'aws_lb.main' and 'aws_lb_target_group.main'.

Terraform

resource "aws_lb_listener" "front_end" {
  load_balancer_arn = aws_lb.main.arn
  port              = 80
  protocol          = "HTTP"
  [1] = [aws_lb.main, [2]]
}

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Adepends_on

Baws_lb_target_group.main

Dprovider

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'provider' instead of 'depends_on'.

Not including both resources in the list.

The depends_on argument is used to declare explicit dependencies. The list includes both resources.

5fill in blank

hard

Fill all three blanks to explicitly depend on 'aws_db_instance.main' and 'aws_security_group.db_sg'.

Terraform

resource "aws_db_parameter_group" "db_pg" {
  name        = "my-db-pg"
  family      = "mysql5.7"
  description = "Custom parameter group"
  [1] = [[2], [3]]
}

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Adepends_on

Baws_db_instance.main

Caws_security_group.db_sg

Daws_subnet.db_subnet

Attempts:

3 left

💡 Hint

Common Mistakes

Not using a list for multiple dependencies.

Including resources not needed for this dependency.

The depends_on argument lists resources to explicitly depend on. Here, it includes the DB instance and security group. The subnet is not included in this example.