File naming conventions (.tf files) in Terraform - Cheat Sheet & Quick Revision

Recall & Review

beginner

Why should Terraform configuration files use the .tf extension?

Terraform recognizes files with the .tf extension as configuration files. This helps Terraform load and process them correctly when running commands.

beginner

What is a good practice for naming Terraform files to keep configurations organized?

Use descriptive names that reflect the purpose, like network.tf for networking resources or variables.tf for variable definitions. This makes it easier to find and manage code.

beginner

Can you use multiple .tf files in one Terraform project folder?

Yes. Terraform automatically loads all .tf files in a folder and combines them. This allows splitting configuration into smaller, manageable parts.

intermediate

Should Terraform files be named with numbers or special characters for ordering?

No. Terraform does not require numbered or special character prefixes. It processes all files together regardless of name order. Use clear descriptive names instead.

intermediate

What file extension is used for Terraform variable values and why?

Terraform uses .tfvars files to store variable values separately from configuration. This helps keep sensitive or environment-specific data organized and secure.

Which file extension should Terraform configuration files have?

A .txt

B .json

C .tf

D .conf

Terraform configuration files must have the .tf extension to be recognized and processed correctly.

How does Terraform handle multiple .tf files in the same folder?

A It ignores files with similar names

B It only loads the first file alphabetically

C It requires files to be numbered to load

D It loads and combines all .tf files automatically

Terraform automatically loads and merges all .tf files in a folder to build the full configuration.

What is a recommended naming style for Terraform files?

A Descriptive names like network.tf or variables.tf

B Random numbers like 001.tf, 002.tf

C Using spaces and special characters

D Using uppercase extensions like .TF

Descriptive names help organize and understand the purpose of each Terraform file.

Which file extension is used for storing Terraform variable values?

A .tfvars

B .tf

C .var

D .json

Terraform uses .tfvars files to separate variable values from configuration code.

Is it necessary to number Terraform files to control their load order?

A Yes, numbering controls load order

B No, Terraform loads all files together regardless of name

C Only if files are in different folders

D Yes, but only for .tfvars files

Terraform processes all .tf files in a folder together without relying on file name order.

Explain why using descriptive file names for Terraform .tf files is important.

Think about how you find files on your computer.

Describe how Terraform processes multiple .tf files in a project folder.

Imagine putting puzzle pieces together.

Practice

1. Which of the following is the most common file name used to define the main Terraform configuration?

easy

A. terraform.tf

B. config.tf

C. setup.tf

D. main.tf

Solution

1. Step 1: Understand common Terraform file names

   The main Terraform configuration is typically placed in a file named main.tf to keep it clear and standard.

2. Step 2: Compare options with common practice

   Among the options, only main.tf is widely recognized and recommended for the main configuration.

3. Final Answer:

   main.tf -> Option D

4. Quick Check:

   Main configuration file = main.tf [OK]

Hint: Main config file is usually named main.tf [OK]

Common Mistakes:

• Choosing uncommon names like config.tf
• Using generic names like terraform.tf
• Confusing setup files with main config

2. Which file name is conventionally used to declare input variables in Terraform?

easy

A. variables.tf

B. inputs.tf

C. vars.tf

D. params.tf

Solution

1. Step 1: Identify the standard file for input variables

   Terraform commonly uses variables.tf to declare input variables for clarity and consistency.

2. Step 2: Check other options for correctness

   Other names like inputs.tf, vars.tf, and params.tf are not standard and may confuse team members.

3. Final Answer:

   variables.tf -> Option A

4. Quick Check:

   Input variables file = variables.tf [OK]

Hint: Input variables go in variables.tf file [OK]

Common Mistakes:

• Using inputs.tf instead of variables.tf
• Shortening to vars.tf which is non-standard
• Naming it params.tf which is unclear

3. Given these files in a Terraform project: main.tf, variables.tf, and outputs.tf, what is the purpose of outputs.tf?

medium

A. To define the resources to create

B. To declare input variables

C. To specify values to show after apply

D. To configure backend storage

Solution

1. Step 1: Understand the role of outputs.tf

   The outputs.tf file is used to declare output values that Terraform will display after applying the configuration.

2. Step 2: Differentiate from other files

   main.tf defines resources, variables.tf declares inputs, and backend configuration is usually in backend.tf or inside main.tf.

3. Final Answer:

   To specify values to show after apply -> Option C

4. Quick Check:

   outputs.tf shows output values [OK]

Hint: Outputs.tf shows results after apply [OK]

Common Mistakes:

• Confusing outputs.tf with variables.tf
• Thinking outputs.tf defines resources
• Assuming outputs.tf configures backend

4. You have a Terraform project with files named main.tf, variables.tf, and output.tf. Why might this violate standard conventions?

medium

A. Because main.tf must contain outputs

B. Because the outputs file is misnamed; it should be outputs.tf

C. Because variables.tf is missing output declarations

D. Because Terraform requires outputs in a .json file

Solution

1. Step 1: Check file naming conventions for outputs

   The conventional file name for outputs is outputs.tf (plural). Naming it output.tf (singular) violates standard conventions.

2. Step 2: Understand Terraform file loading

   Terraform loads all .tf files regardless of name for functionality, but standard names improve clarity and teamwork.

3. Final Answer:

   Because the outputs file is misnamed; it should be outputs.tf -> Option B

4. Quick Check:

   outputs file = outputs.tf [OK]

Hint: Outputs file should be named outputs.tf [OK]

Common Mistakes:

• Assuming outputs can be in variables.tf
• Thinking main.tf must have outputs
• Expecting outputs in JSON files

5. You want to organize a large Terraform project by splitting configurations into multiple files. Which naming approach best supports teamwork and maintenance?

hard

A. Use descriptive names like network.tf, compute.tf, variables.tf, outputs.tf

B. Name all files config1.tf, config2.tf, config3.tf for simplicity

C. Put all code in main.tf to avoid confusion

D. Use random names to avoid predictable patterns

Solution

1. Step 1: Consider clarity and teamwork in file naming

   Descriptive file names like network.tf and compute.tf help team members quickly find and understand code sections.

2. Step 2: Evaluate other naming options

   Generic names like config1.tf or random names cause confusion and make maintenance harder. Putting all code in one file reduces clarity.

3. Final Answer:

   Use descriptive names like network.tf, compute.tf, variables.tf, outputs.tf -> Option A

4. Quick Check:

   Descriptive file names improve teamwork [OK]

Hint: Use clear, descriptive file names for easier teamwork [OK]

Common Mistakes:

• Using numbered or random file names
• Putting all code in one file
• Ignoring naming conventions for clarity