TF-004 Practice Test 7 — 10 Questions

Question 1

During a deployment, a user runs `terraform apply` but the command fails because the state lock cannot be acquired. They suspect the lock was released after the previous `apply` but is still held. What command can they use to force unlock the state?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

`terraform force-unlock <lock_id>`. When Terraform cannot acquire a state lock because it was not properly released (e.g., after a crash or interrupted apply), the `force-unlock` command is the only built-in way to manually break the lock. You must provide the lock ID (obtained from the error message or backend) to override the lock, which is stored in the backend (e.g., DynamoDB, Consul) and prevents concurrent modifications. This command is designed for recovery scenarios where the lock holder is known to be dead.

Answer

`terraform init -force-copy`

Answer

`terraform state unlock`

Answer

`terraform break-lock`

Question 2

A company wants to manage its infrastructure as code using Terraform. The team has a mix of on-premises servers and cloud resources in AWS and Azure. Which of the following best describes Terraform's purpose in this scenario?

Accepted Answer

Terraform is an infrastructure-as-code tool for provisioning and managing any infrastructure across multiple providers.. Terraform is explicitly designed as an infrastructure-as-code tool that uses declarative configuration files to provision and manage resources across multiple providers, including on-premises servers (via providers like vSphere or Hyper-V) and cloud platforms like AWS and Azure. Its provider model allows it to abstract away the underlying APIs, making it provider-agnostic and suitable for hybrid environments.

Answer

Terraform is a configuration management tool for installing software on existing servers.

Answer

Terraform is a cloud-specific orchestration tool that only works with AWS.

Answer

Terraform is a monitoring and logging tool for cloud resources.

Question 3

A DevOps engineer runs terraform plan and sees that a resource will be destroyed and recreated, but they expected an in-place update. The resource is an AWS EC2 instance with a specific AMI. Which attribute change is most likely causing the destruction?

Accepted Answer

The AMI ID was changed.. Changing the AMI ID of an AWS EC2 instance is a force-new attribute in Terraform. Because the AMI defines the root block device and operating system, Terraform cannot perform an in-place update; it must destroy the existing instance and create a new one with the new AMI. This behavior is hardcoded in the Terraform AWS provider for the `aws_instance` resource.

Answer

The security group list was modified.

Answer

The tags were updated.

Answer

The instance type was reduced from large to micro.

Question 4

Which version of the module was downloaded and why?

Accepted Answer

3.19.0, because it is the latest version matching the constraint ~> 3.0, which allows any 3.x version.. The constraint `~> 3.0` in Terraform's version constraint syntax allows only the rightmost element to increment. Since `3.0` is a two-part version, the constraint permits any version in the `3.x` range (i.e., `3.0.0` up to but not including `4.0.0`). Therefore, the latest version matching that constraint is `3.19.0`, which is the highest available 3.x version.

Answer

3.0.0, because ~> 3.0 only allows the exact version 3.0.0.

Answer

3.19.0, because it is the latest version and version constraints are ignored.

Answer

3.0.0, because ~> 3.0 is limited to patch updates within 3.0.x.

Question 5

Drag and drop the steps to use Terraform modules from the registry in the correct order.

Accepted Answer

Write the module block in main.tf, then run terraform init, then set input variables in terraform.tfvars, then run terraform plan and terraform apply.. Registry modules are sourced; init downloads, variables configure, plan/apply deploy.

Answer

Run terraform init, then write the module block, then set input variables, then run terraform plan and apply.

Answer

Write the module block, then set input variables, then run terraform init, then run terraform plan and apply.

Answer

Write the module block, then run terraform plan and apply, then run terraform init, then set input variables.

Question 6

A team wants to use Terraform to manage their AWS infrastructure. They have existing resources created manually. What is the recommended approach to bring these resources under Terraform management?

Accepted Answer

Use terraform import to bring each resource into state.. `terraform import` is the recommended approach to bring existing manually created resources under Terraform management. It maps the real-world resource ID into your Terraform state file, allowing Terraform to track and manage it without deleting or recreating it. This preserves the existing infrastructure while enabling future updates via configuration.

Answer

Delete the existing resources and recreate them using Terraform configuration.

Answer

Use terraform plan to detect existing resources and automatically adopt them.

Answer

Write Terraform configuration that matches existing resources and run terraform apply.

Question 7

A Terraform configuration includes a resource block with a 'lifecycle' block that has 'create_before_destroy = true'. During an apply, the create step succeeds but the destroy step fails. What is the resulting state?

Accepted Answer

Both the old and new resources are in state.. When `create_before_destroy = true` is set, Terraform creates the new resource first, then destroys the old one. If the destroy step fails after the new resource is created, both resources exist in the state file because Terraform does not remove the old resource from state until the destroy operation completes successfully. The state retains both resource instances at the same address, which is why option D is correct.

Answer

Only the new resource remains in state, old resource is destroyed.

Answer

The state is empty for that resource address.

Answer

Only the old resource remains in state.

Question 8

A company uses Terraform Cloud and wants to ensure that only approved modules from the private registry are used in configurations. How can they enforce this?

Accepted Answer

Use Sentinel policies to check module sources. Sentinel is HashiCorp's policy-as-code framework that can enforce governance rules on Terraform Cloud runs. By writing a Sentinel policy that inspects the `module` block's `source` attribute, you can restrict configurations to only use modules from the approved private registry, rejecting any run that references external or unapproved sources.

Answer

Restrict module sources in VCS

Answer

Configure workspace variables to limit module paths

Answer

Use run tasks to scan for module types

Question 9

A DevOps engineer needs to generate multiple similar AWS EC2 instances from a single resource block. They want each instance to have a unique name tag based on an index. Which approach should they use?

Accepted Answer

Use `count` and reference `count.index` for the name tag. The `count` meta-argument creates multiple resources from a single resource block, and `count.index` provides a zero-based index for each instance. This index can be used directly in the name tag, such as `"instance-${count.index}"`, to generate unique names. `count` is the simplest and most appropriate mechanism when you need a fixed number of similar resources differentiated by an index.

Answer

Use a `locals` block to define multiple resources

Answer

Use `for_each` and reference `each.key` for the name tag

Answer

Use a `terraform_data` resource to loop

Question 10

An organization uses a remote backend (S3) with DynamoDB for state locking. A developer runs `terraform plan` and gets the error: "Error acquiring the state lock: ConditionalCheckFailedException". What is the most likely cause?

Accepted Answer

Another Terraform process is currently holding the state lock. The error 'ConditionalCheckFailedException' occurs when Terraform attempts to acquire a lock in DynamoDB but the conditional write fails because the lock item already exists with a different lock ID. This indicates another Terraform process (or a stale lock) is currently holding the state lock, preventing concurrent operations to protect state integrity.

Answer

The S3 bucket does not exist

Answer

The DynamoDB table is not yet created

Answer

The Terraform version is incompatible with the backend