Terraform Tutorials: How to comments in terraform code?

Terraform code supports three different syntaxes for comments:

• Single-line comments:
  • # begins a single-line comment, ending at the end of the line.
  • // also begins a single-line comment, as an alternative to #.
• Multi-line comments:
  • /* and */ are start and end delimiters for a comment that might span over multiple lines.

Comments can be placed anywhere in a Terraform configuration file, but they are typically placed at the beginning of a file or before a specific resource. Comments can be used to:

• Document your Terraform code and explain what it does.
• Make your Terraform code more readable and easier to understand.
• Disable or uncomment sections of your Terraform code.

Here are some examples of comments in Terraform code:

# This is a single-line comment.

// This is also a single-line comment.

/*
This is a multi-line comment.
*/

variable "instance_type" {
  type = string
  description = "The type of EC2 instance to launch."
  default = "t2.micro"
}

resource "aws_instance" "example" {
  ami = "ami-06984b521991bb600"
  instance_type = var.instance_type

  tags = {
    Name = "My Example Instance"
  }
}Code language: PHP (php)

Explanation:

• # starts a single-line comment, which ends at the end of the line.
• // also starts a single-line comment, as an alternative to #.
• /* starts a multi-line comment, and */ ends it.

The single-line comments in the example are used to document the purpose of the variable and resource blocks. The multi-line comment is used to document the tags that will be applied to the EC2 instance.

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.