How to Add Comments in Terraform

Terraform , a powerful Infrastructure as Code (IaC) tool, allows you to define and provision infrastructure resources. Properly commenting your Terraform code is essential for maintaining readability and sharing insights with your team. In this comprehensive guide, we’ll explore various methods to add comments in Terraform and address common questions related to Terraform syntax and best practices .

Adding Comments in Terraform

1. # - Single Line Comment

The # symbol marks the beginning of a single-line comment in Terraform. Anything following # on the same line is considered a comment.

# This is a single-line comment
resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"
}

2. // - Alternate Single Line Comment

Terraform also supports the // symbol for single-line comments, similar to many other programming languages. It’s a matter of preference, and popular formatting tools often replace // with #.

// This is a single-line comment
resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"
}

3. /* and */ - Multi-line Comments

For multi-line comments in Terraform, use /* to start the comment block and */ to end it. Everything between these delimiters is treated as a comment.

/* This is a
   multi-line comment */
resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"
}

More Questions?

How do you comment out in Terraform?

To comment out code in Terraform, you can use the # symbol for single-line comments or enclose the code within /* and */ for multi-line comments.

How do you comment multiple lines in Terraform in VS Code?

In VS Code, you can use Ctrl+/ to comment or uncomment selected lines or blocks of code. This keyboard shortcut works for both single-line (#) and multi-line (/* */) comments.

What is Terraform syntax?

Terraform uses HashiCorp Configuration Language (HCL) syntax for defining infrastructure as code. It’s a human-readable language designed for configuration files.

What is HCL in Terraform?

HCL stands for HashiCorp Configuration Language, and it’s the language used by Terraform for writing infrastructure code. HCL is designed to be simple and easy to read.

How do you comment or comment out in coding?

The method for commenting out code depends on the programming language. In Terraform, you can use # for single-line comments and /* */ for multi-line comments.

How do you comment multiple lines?

To comment multiple lines of code in Terraform, use /* to start the comment block and */ to end it.

How do you write a Terraform script?

To write a Terraform script, you need to define your infrastructure resources using Terraform configuration files with the .tf extension. These files contain resource definitions and provider information.

How to comment multiple lines at once in C?

In C programming, you can comment multiple lines by enclosing them within /* and */. This is similar to multi-line comments in Terraform.

What are Terraform basic commands?

Terraform provides several basic commands, including init, plan, apply, and destroy. These commands are used to initialize, plan, apply, and destroy infrastructure defined in Terraform code.

What does => mean in Terraform?

In Terraform, => is not used. However, => is commonly used in other programming languages like JavaScript to denote function parameters or arrow functions.

What is () in Terraform?

In Terraform, () is used for function calls and resource references. For example, to reference an AWS instance, you might use "aws_instance.example.id".

How do I comment out lines in properties file?

To comment out lines in a properties file, you can use # for single-line comments, or use ! to comment out lines in INI-style properties files.

How do I comment out in a .YAML file?

In YAML files, you can use # for single-line comments. To comment out a line, simply prefix it with #.

How do I comment out a markdown file?

In Markdown, you can use <!-- to start a comment and --> to end it. Anything between these delimiters is considered a comment.

Can you comment in env files?

Yes, you can add comments in environment (.env) files by using the # symbol for single-line comments. Comments in .env files are ignored and do not affect the environment variables.

Closing Remarks

This guide should help you effectively comment your Terraform code, understand Terraform syntax, and address common questions related to commenting and coding practices. Properly documented Terraform code is key to collaboration and maintaining infrastructure as code projects.