Is there an AND/OR Conditional Operator in Terraform?

TLDR

Terraform supports AND (&&) and OR (||) conditional operators for creating dynamic configurations. These operators are used in expressions to evaluate multiple conditions.

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Using AND/OR Conditional Operators in Terraform

In Terraform, you can use logical operators to combine multiple conditions. These operators are particularly useful when defining resource conditions, variable defaults, or dynamic blocks.

AND Operator (&&)

The && operator returns true if both conditions are true. Here's an example:

variable "enable_feature" {
  default = true
}

variable "is_production" {
  default = false
}

output "should_enable" {
  value = var.enable_feature && var.is_production
}

In this example, the should_enable output will only be true if both enable_feature and is_production are true.

OR Operator (||)

The || operator returns true if either condition is true. Here's an example:

variable "enable_feature" {
  default = true
}

variable "is_production" {
  default = false
}

output "should_enable" {
  value = var.enable_feature || var.is_production
}

In this case, the should_enable output will be true if either enable_feature or is_production is true.

Combining AND and OR

You can combine && and || operators to create more complex conditions. Use parentheses to ensure the correct order of operations:

output "complex_condition" {
  value = (var.enable_feature && var.is_production) || var.enable_feature
}

Best Practices

• Use Parentheses: Always use parentheses to make complex conditions more readable and avoid logical errors.
• Keep Conditions Simple: Break down complex conditions into smaller, reusable variables for better readability.
• Test Your Logic: Use terraform console to test your expressions before applying them.

By understanding and using AND/OR operators effectively, you can create more dynamic and flexible Terraform configurations.