terraform_required_version.md

terraform_required_version

Disallow terraform declarations without required_version.

This rule is enabled by "recommended" preset.

Configuration

rule "terraform_required_version" {
  enabled = true
}

Example

terraform {
  required_version = ">= 1.0" 
}

$ tflint
1 issue(s) found:

Warning: terraform "required_version" attribute is required

Reference: https://github.com/terraform-linters/tflint-ruleset-terraform/blob/v0.1.0/docs/rules/terraform_required_version.md 

Why

The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration. If the running version of Terraform doesn't match the constraints specified, Terraform will produce an error and exit without taking any further actions.

How To Fix

Add the required_version attribute to the terraform configuration block.