QUESTION: 241

You wanted to destroy some of the dependent resources from real infrastructure. You choose to delete those resources from your configuration file and run terraform plan and then apply. Which of the following way your resources would be destroyed?

Terraform can still determine the correct order for destruction from the state even when you delete one or more items from the configuration.
Those would be destroyed in the order in which they were written in the configuration file previously before you have deleted them from configuration file.
The resource will be destructed in random order as you have already deleted them from configuration.
You can not destroy resources by deleting them from configuration file and running plan and apply.

Answer(s): A

Explanation:

Terraform typically uses the configuration to determine dependency order. However, when you delete a resource from a Terraform configuration, Terraform must know how to delete that resource. Terraform can see that a mapping exists for a resource not in your configuration and plan to destroy. However, since the configuration no longer exists, the order cannot be determined from the configuration alone.
To ensure correct operation, Terraform retains a copy of the most recent set of dependencies within the state. Now Terraform can still determine the correct order for destruction from the state when you delete one or more items from the configuration.

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QUESTION: 242

Your developers are facing a lot of problem while writing complex expressions involving difficult interpolations . They have to run the terraform plan every time and check whether there are errors , and also check terraform apply to print the value as a temporary output for debugging purposes.
What should be done to avoid this?

Use terraform console command to have an interactive UI with full access to the underlying terraform state to run your interpolations , and debug at real-time.
Add a breakpoint in your code, using the watch keyword , and output the value to console for temporary debugging.
Use terraform zipmap function , it will be able to easily do the interpolations without complex code.
Use terraform console command to have an interactive UI , but you can only use it with local state
, and it does not work with remote state.

Answer(s): A

Explanation:

The terraform console command provides an interactive console for evaluating expressions. This is useful for testing interpolations before using them in configurations, and for interacting with any values currently saved in state.

Reference:

https://www.terraform.io/docs/commands/console.html

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QUESTION: 243

When writing Terraform code, HashiCorp recommends that you use how many spaces between each nesting level?

Answer(s): C

Explanation:

The Terraform parser allows you some flexibility in how you lay out the elements in your configuration files, but the Terraform language also has some idiomatic style conventions which we recommend users always follow for consistency between files and modules written by different teams. Automatic source code formatting tools may apply these conventions automatically.
Indent two spaces for each nesting level.
When multiple arguments with single-line values appear on consecutive lines at the same nesting level, align their equals signs:
ami = "abc123" instance_type = "t2.micro"
When both arguments and blocks appear together inside a block body, place all of the arguments together at the top and then place nested blocks below them. Use one blank line to separate the arguments from the blocks.
Use empty lines to separate logical groups of arguments within a block.
For blocks that contain both arguments and "meta-arguments" (as defined by the Terraform language semantics), list meta-arguments first and separate them from other arguments with one blank line. Place meta-argument blocks last and separate them from other blocks with one blank line.
resource "aws_instance" "example" { count = 2 # meta-argument first ami = "abc123" instance_type = "t2.micro" network_interface {
# ...
}
lifecycle { # meta-argument block last create_before_destroy = true
}
}
Top-level blocks should always be separated from one another by one blank line. Nested blocks should also be separated by blank lines, except when grouping together related blocks of the same type (like multiple provisioner blocks in a resource).
Avoid separating multiple blocks of the same type with other blocks of a different type, unless the block types are defined by semantics to form a family. (For example: root_block_device, ebs_block_device and

ephemeral_block_device on aws_instance form a family of block types describing AWS block devices, and can therefore be grouped together and mixed.)

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QUESTION: 244

When using parent/child modules to deploy infrastructure, how would you export a value from one module to import into another module.
For example, a module dynamically deploys an application instance or virtual machine, and you need the IP address in another module to configure a related DNS record in order to reach the newly deployed application.

Export the value using terraform export and input the value using terraform input.
Configure the pertinent provider's configuration with a list of possible IP addresses to use.
Configure an output value in the application module in order to use that value for the DNS module.
Preconfigure the IP address as a parameter in the DNS module.

Answer(s): C

Explanation:

Output values are like the return values of a Terraform module, and have several uses:
* A child module can use outputs to expose a subset of its resource attributes to a parent module.
* A root module can use outputs to print certain values in the CLI output after running terraform apply.
* When using remote state, root module outputs can be accessed by other configurations via a terraform_remote_state data source.

Reference:

https://www.terraform.io/docs/configuration/outputs.html

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QUESTION: 241

Explanation:

QUESTION: 242

Explanation:

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QUESTION: 243

Explanation:

QUESTION: 244

Explanation:

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