Using a Module for Common Configurations

<p>On Leanpub (D)</p> Signup and view all the answers

<p>Terraform Tuesdays (D)</p> Signup and view all the answers

<p>To define inputs, resources, and outputs. (C)</p> Signup and view all the answers

<p>A root module acts as a parent to child modules. (B)</p> Signup and view all the answers

<p>By utilizing the for_each or count meta arguments. (B)</p> Signup and view all the answers

<p>Parent Module (C)</p> Signup and view all the answers

<p>To control the flow of information between modules. (D)</p> Signup and view all the answers

<p>A set of .tf or .tf.json files in a directory constitutes a module. (D)</p> Signup and view all the answers

<p>It enables quicker implementation of common configurations. (D)</p> Signup and view all the answers

<p>It can lead to resource duplication if not controlled. (A)</p> Signup and view all the answers

<p>To pin it to a specific version and avoid breaking configurations. (C)</p> Signup and view all the answers

<p>It extracts a subset of a list based on specified indices. (B)</p> Signup and view all the answers

<p>It is exclusive and will not be included in the extracted list. (B)</p> Signup and view all the answers

<p>You must run Terraform to download the new provider or module. (A)</p> Signup and view all the answers

<p>Using the slice function to reference a data source. (B)</p> Signup and view all the answers

<p>It creates a tuple. (C)</p> Signup and view all the answers

<p>To transform an existing collection into another collection. (A)</p> Signup and view all the answers

<p>It filters values from the input for conditional transformation. (A)</p> Signup and view all the answers

<p>Delete the private_subnets argument from the configuration. (B)</p> Signup and view all the answers

<p>By applying for expressions for dynamic calculation. (B)</p> Signup and view all the answers

<p>Curly braces. (C)</p> Signup and view all the answers

<p>Specify that a certain version should be used until changed. (A)</p> Signup and view all the answers

<p>An error message will be returned stating the module is not installed. (B)</p> Signup and view all the answers

<p>Ignore versioning as it is not essential for the module. (C)</p> Signup and view all the answers

<p>It allows you to set provider aliases for the child module. (C)</p> Signup and view all the answers

<p>Use the syntax module.moduleName.outputValue. (A)</p> Signup and view all the answers

<p>Terraform will use the default provider instance. (C)</p> Signup and view all the answers

<p>The child module must define the output correctly. (A)</p> Signup and view all the answers

<p>Descriptions of inputs, outputs, dependencies, and resource types. (A)</p> Signup and view all the answers

<p>modules.tacos.aws_s3_bucket.main.id (A)</p> Signup and view all the answers

<p>To declare dependencies that must be satisfied before the module runs. (A)</p> Signup and view all the answers

<p>Pricing details of the module (D)</p> Signup and view all the answers

<p>Using a short form address provided in the module instructions. (C)</p> Signup and view all the answers

<p>To provide context about what values are being returned or required. (D)</p> Signup and view all the answers

<p>It will result in an error since direct references are not permitted. (B)</p> Signup and view all the answers

<p>Modules can provide a community source of best practices. (B)</p> Signup and view all the answers

<p>module.web_app_s3.web_bucket.id (A)</p> Signup and view all the answers

<p>They can cause inconsistencies during initialization. (B)</p> Signup and view all the answers

<p>Any references to the bucket must point to the module's output value. (B)</p> Signup and view all the answers

<p>terraform init (D)</p> Signup and view all the answers

<p>elb_service_account_arn (A)</p> Signup and view all the answers

<p>Terraform will recreate the resource with a new identifier. (C)</p> Signup and view all the answers

<p>module.web_app_s3.web_bucket.id (D)</p> Signup and view all the answers

<p>To move a resource entry to a new identifier address. (B)</p> Signup and view all the answers

<p>terraform fmt -recursive (C)</p> Signup and view all the answers

<p>Creates them without relation to previous resources. (D)</p> Signup and view all the answers

<p>Literal value (A)</p> Signup and view all the answers

<p>Run terraform validate (B)</p> Signup and view all the answers

<p>Export your environment variables. (C)</p> Signup and view all the answers

<p>The subnet will be destroyed in the target environment. (B)</p> Signup and view all the answers

<p>To allow logical grouping of resources for code reuse. (C)</p> Signup and view all the answers

<p>From local file system, source control repositories, or remote registries. (C)</p> Signup and view all the answers

<p>The ability to specify a version when invoking a module. (A)</p> Signup and view all the answers

<p>Output values are how a child module can communicate with a parent module. (B)</p> Signup and view all the answers

<p>Modules must have both input variables and output values to be functional. (D)</p> Signup and view all the answers

<p>It allows users to revert to previous stable configurations. (C)</p> Signup and view all the answers

<p>In the module block as part of the provider's argument. (A)</p> Signup and view all the answers

<p>Terraform files that define resources along with variables and outputs. (B)</p> Signup and view all the answers

<p>Terraform will add an entry to modules.json indicating the module location. (C)</p> Signup and view all the answers

<p>It communicates with the parent module solely through output values. (B)</p> Signup and view all the answers

<p>The location where Terraform can find the module. (D)</p> Signup and view all the answers

<p>It allows swapping modules without changing parent modules as long as inputs and outputs match. (D)</p> Signup and view all the answers

<p>Standardize on the VPC module from the Terraform public registry and create an S3 module. (C)</p> Signup and view all the answers

<p>They provide a way for child modules to send data back to parent modules. (A)</p> Signup and view all the answers

<p>An object can have values of different data types. (B)</p> Signup and view all the answers

<p>The number of iterators based on the input type. (D)</p> Signup and view all the answers

<p>=&gt; (B)</p> Signup and view all the answers

<p>range (C)</p> Signup and view all the answers

<p>Terraform will implicitly convert it to a list. (C)</p> Signup and view all the answers

<p>Using a for expression with the ceiling function on the price. (B)</p> Signup and view all the answers

<p>It generates CIDR subnet addresses based on the input. (A)</p> Signup and view all the answers

<p>To define the number of public subnets to create. (B)</p> Signup and view all the answers

<p>They create unnecessary costs without private subnets. (C)</p> Signup and view all the answers

<p>By referencing existing module documents. (C)</p> Signup and view all the answers

<p>module.app.public_subnets (C)</p> Signup and view all the answers

<p>The documentation for the outputs available in the module. (C)</p> Signup and view all the answers

<p>list (A)</p> Signup and view all the answers

<p>terraform state mv (C)</p> Signup and view all the answers

<p>Run a terraform apply to update the infrastructure. (D)</p> Signup and view all the answers

<p>to and from identifiers (D)</p> Signup and view all the answers

<p>Add the moved block to your configuration (A)</p> Signup and view all the answers

<p>Resources being used by dependencies (D)</p> Signup and view all the answers

<p>To force replacement of resources (B)</p> Signup and view all the answers

<p>Bucket name, ELB service account ARN, and common tags (B)</p> Signup and view all the answers

<p>variables.tf, main.tf, outputs.tf, terraform.tf (C)</p> Signup and view all the answers

<p>They enable reusable configurations for various applications (B)</p> Signup and view all the answers

<p>Consistent and repeatable deployments (D)</p> Signup and view all the answers

<p>Map with string values (D)</p> Signup and view all the answers

<p>S3 bucket and instance profile objects (D)</p> Signup and view all the answers

<p>You can focus on more interesting tasks (D)</p> Signup and view all the answers

<p>It is where all variables and resources are defined (C)</p> Signup and view all the answers

<p>It automatically inherits providers from the parent module (D)</p> Signup and view all the answers

<p>Prefix the role name with the bucket name (B)</p> Signup and view all the answers

<p>Give Terraform a helping hand to recognize them (B)</p> Signup and view all the answers

<p>Increased chances of mistakes (D)</p> Signup and view all the answers

<p>To specify the version of providers used (A)</p> Signup and view all the answers

<p>Input variables must be used due to the scope of the module (B)</p> Signup and view all the answers

<p>By entering a predefined URL in a browser (D)</p> Signup and view all the answers

<p>By publishing it to a public registry (A)</p> Signup and view all the answers

<p>Identify resources that need replacing (D)</p> Signup and view all the answers

<p>An empty map will be used as default (C)</p> Signup and view all the answers

<p>It saves time and effort by reusing existing work (C)</p> Signup and view all the answers

<p>The entire S3 bucket object and instance profile (D)</p> Signup and view all the answers

<p>It allows the load balancer to write logs (C)</p> Signup and view all the answers

<p>Create a directory structure (A)</p> Signup and view all the answers

A collection of Terraform configuration files that define inputs, resources, data sources, and outputs. It allows for reusable and modular infrastructure code.

The main Terraform configuration file that acts as the top level of your project and can invoke other modules.

A module that is called by another module to provide specific infrastructure components.

A module that calls another module to reuse its defined infrastructure components. It can be used to organize code and make infrastructure definitions more reusable.

Data that is passed from a parent module to a child module.

Data that is returned from a child module to a parent module.

A mechanism to control the behavior of modules. It can be used to create multiple instances of a module or to iterate over a set of resources.

A hierarchical structure in Terraform modules where a parent module invokes child modules, allowing for complex infrastructure definitions with reusable components.

Allows you to define and reuse configurations, breaking down infrastructure into manageable components.

A mechanism within module blocks that allows controlling the execution order of resources. Useful for managing dependencies between resources in modules.

Defines the location of the module's configuration files within the Terraform registry or local file system.

Allows selecting a specific version or range of versions for the chosen Terraform module.

Specifies which provider instances from the parent module should be used within the child module.

A module that defines a VPC, a network infrastructure component. It's available on the Terraform registry.

The main page of the Terraform Registry, where you can find various modules and providers.

A section in the Terraform Registry that lists various modules categorized by providers.

A section in the Terraform Registry that provides information about the module, including its inputs, outputs, resources, and dependencies.

A collection of code that demonstrates how to use a specific module.

Modules can be obtained from various sources, including your local machine, a source control system like Git, or a remote registry.

The Terraform public registry is a popular source for modules, similar to how you find providers.

Modules in registries have versions, similar to providers, allowing you to specify a specific version to prevent unexpected changes.

Terraform downloads modules from the source location to your working directory when you run Terraform.

If a module already exists locally, Terraform will use it without copying it, simply referencing its location.

Modules support the 'count' and 'for_each' meta-arguments to create multiple instances of a module.

Modules inherit providers defined in the parent configuration, but can also specify their own Terraform or provider versions.

You can select a specific provider within a module using the 'provider' argument for customizing provider configurations.

Modules typically have input variables to receive values, output values to return information, and resources and data sources to create or access infrastructure.

Input variables allow the parent module to pass data to the child module, ensuring information flow between them.

Output values allow child modules to return information to the parent module, enabling communication and data transfer.

Modules are designed to be self-contained and reusable, allowing for modularity and easy replacement without impacting parent configurations.

A module block begins with the 'module' keyword followed by a descriptive name label that explains the module's purpose.

The 'source' argument within a module block tells Terraform where to retrieve the module from, specifying its location or registry.

A Terraform argument used to specify a module's version, ensuring consistent infrastructure configurations.

A command used to update a Terraform module to its latest version.

A Terraform function used to extract a portion of a list.

A Terraform command that provides an interactive console for exploring and testing expressions.

Running Terraform init on a directory where a new provider or module has been added.

A Terraform expression that creates a new collection from an existing collection, applying transformations to each element.

A data type used to store a sequence of elements, allowing for different data types within the collection.

A data type used to store a set of key-value pairs, offering flexibility in organizing data.

The process of using a conditional statement to filter elements within a for expression.

Square brackets ([]) used in a for expression to indicate that the output will be a tuple.

Curly braces ({}) used in a for expression to indicate that the output will be an object.

A placeholder variable used in a for expression to represent each element from the input collection during iteration.

The keyword in used in a for expression to link the iterator term with the input collection.

A Terraform function used to calculate a CIDR block subnet.

Computing a list of CIDR subnet ranges for public subnets using a for expression.

Terraform Associate is a certification that tests your knowledge of Terraform fundamentals. It's a good stepping stone towards advanced Terraform skills.

HashiCorp's Vault is a powerful tool used for managing and storing sensitive data like API keys, passwords, and certificates. It helps maintain security and control over your sensitive information.

Packer is a tool used to create consistent, repeatable machine images (often called 'gold images'). These images are used for deploying virtual machines or containers, ensuring consistency across your infrastructure.

Ned in the Cloud is a YouTube channel hosted by Ned, where he shares valuable tutorials and content about Terraform, including a series called Terraform Tuesdays.

Terraform Tuesdays is a recurring series on Ned in the Cloud, providing regular insights and tutorials on Terraform, keeping you up to speed with the latest updates and best practices.

A Terraform command that allows you to move resources from one location in your state to another.

A block added to your Terraform configuration for each resource that is moving. It specifies the 'from' and 'to' identifiers for the resource.

The process of replacing an existing resource with a new one.

A Terraform argument that forces Terraform to replace a resource instead of updating it in place.

Dependencies or relationships between resources that are not explicitly documented in Terraform configuration.

A mechanism in Terraform that allows you to define and reuse configurations, making infrastructure code more modular and reusable.

The main Terraform configuration file that acts as the entry point for your project. It can invoke other modules.

The process of automating the creation and management of infrastructure.

Using Terraform modules from the Terraform Registry to save time and effort.

A collection of various modules and providers, a central repository for Terraform components.

The benefits of using IaC (infrastructure as code), such as consistency, repeatability, and reduced errors.

The process of manually configuring infrastructure, which can be prone to errors and inconsistencies.

The ability to create common configuration patterns and encapsulate them in modules for easy reuse and sharing.

Improving your job or finding a better job by leveraging IaC skills.

The ability to deploy infrastructure consistently and repeatably, reducing errors and inconsistencies.

A list containing all the public subnets defined in the Terraform configuration.

A variable that holds the name of the S3 bucket.

A variable that stores the ARN (Amazon Resource Name) of the Elastic Load Balancer (ELB) service account.

A variable that holds a map containing tags to be applied to all resources in the module.

A module responsible for creating an S3 bucket, managing IAM roles and policies for accessing the bucket, and configuring access for the EC2 instances.

A Terraform file where you define the input variables for the S3 module.

A Terraform file where you define the resources that the S3 module will create.

A Terraform file where you define the output values that the S3 module will return to the parent module.

A Terraform file where you define the providers required for the S3 module.

A Terraform file where you define the provider configurations for the root module.

Code referencing the provider to ensure compatibility with a specific version.

A Terraform module residing locally with the rest of your configuration.

A Terraform module stored and shared in a public or private registry.

A mechanism where a child module receives data from the parent module.

The value returned by a child module to the parent module.

An object is similar to a map, but its values can be of various data types. It uses iterators to process values within the object.

The Terraform expression language uses iterators to access values within input data structures like maps and lists. For maps, two iterators are required; one for the key and another for the value.

The input for an object expression can be a map, list, or even a tuple. The number of iterators needed depends on the input type. One iterator for lists and two for maps.

An object expression utilizes the colon (:) followed by an expression that evaluates for each entry within the object. The syntax is key => value.

The Terraform 'range' function generates a list of integers, useful for creating sequences of values. The syntax is range(value), where value is the end of counting.

Terraform's 'cidrsubnet' function creates a subnet address by adding a specific number of bits to the given CIDR block. It takes three arguments: CIDR block, number of bits to add, and the subnet index.

A for expression in Terraform evaluates a given expression for each element in an input list. It uses an iterator to access each element. The output can be a list or a tuple.

A tuple in Terraform is similar to a list, but it uses round brackets instead of square brackets. Each element in a tuple is ordered and can be accessed by its index.

When using a for expression, Terraform can implicitly convert the output tuple to a list if the intended output is a list of strings.

By removing the resources that were manually defined and replacing them with a module, we can simplify our configuration and improve its reusability.

Modules in Terraform have outputs that allow them to return values to the main configuration. These outputs can be referenced like variables, providing access to data generated within the module.

A Terraform module can be referenced by its name using the module keyword followed by the module's name, then the output name. For example, module.app.vpc_id accesses the 'vpc_id' output from the 'app' module.

Terraform modules can be used to manage complex resources and provide outputs that simplify the configuration of other resources.

The public_subnets output of a module can be referenced in the load balancer configuration to specify the subnets it should be associated with.

Modules play a key role in Terraform by encapsulating configurations, simplifying code, and promoting reusable infrastructure components.

Terraform evaluates modules during initialization and writes the path to the modules.json file, which needs to be consistent. This path needs to be a literal value and not one to be interpreted by Terraform because path expressions can change depending on the module and current working directory.

Moving a resource entry to a new identifier in the Terraform state, used to preserve the original resource in the target environment.

Outputs are used to expose the values of resources or data sources defined within the module to its parent module. This allows for shared information and coordinated infrastructure management.

Terraform treats each resource with a unique identifier as distinct entities, leading to the creation of new resources when configurations are updated with new resource identifiers.

A local module block is a special type of module that is defined within the same directory as the main configuration. It isn't stored in a separate directory and is used for local-only configurations.

To ensure that a particular resource is created before another one relies on it, developers can use the depends_on meta-argument. For example, a resource that needs access to a bucket should depend on the bucket being created first.

A variable type in Terraform that is local to the module and can be used within that module, but cannot be accessed globally.

When a module is called, it receives input values. These values are used to configure and customize the resources and data defined within the module.

When a module is invoked, the source attribute specifies the location of the module code. Terraform will search the modules.json file for the source and retrieve the module's configurations to deploy the resources.

Modules are often organized into a hierarchical structure. Each module can call other modules, creating a nested structure. This allows for modularity and reusable infrastructure components at different levels.

Refers to the main Terraform configuration file, the starting point of your Terraform project. Other modules are called from this file.

The command terraform fmt is used to automatically format your Terraform code according to recommended best practices, making it easier to read and maintain.

Terraform's init command is used to prepare your working directory for Terraform. It downloads and installs required modules from local or remote sources, making your configuration ready for execution.