Terraform by Example

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Operators

In Terraform it’s common to use operators to implement validation logic.

Equality operator #

Equality operators take two values and produces a boolean value.

variable "user_count" {
  type        = number
  description = "Amount of users"

  validation {
    condition     = var.user_count != 1"
    error_message = "User count cannot be 1"
  }
}

Comparison operator #

Comparison operators take two numbers and produces a boolean value.

variable "user_count" {
  type        = number
  description = "Amount of users"

  validation {
    condition     = var.user_count >= 1"
    error_message = "User count must be at least 1"
  }
}

Logical operator #

Logical operators are often used to chain operators.

variable "user_count" {
  type        = number
  description = "Amount of users"

  validation {
    condition     = var.user_count >= 1 && var.user_count <= 100"
    error_message = "User count must be between 1 and 100"
  }
}

Want to learn more about Operators? Check out the docs.

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