How to pin terraform provider?

Question

I'm working on terraform rds cluster for building aurora , Can someone help me on how to pin the aws provider version to 2.0 ?

Is this a correct way to do it?

provider "aws" {
  region = "us-east-1"

  version = "<= 2.0"
}

Also my module earlier used 2.46 version, should i follow any steps while trying to do the downgrade?

Using terraform 0.12.6 version

Answer 1

You need to use just the equals operator = and not <=, which means "less than or equal to version 2.0".

If you want it to use version 2.0 only:

provider "aws" {
  region = "us-east-1"

  version = "= 2.0"
}

See also https://www.terraform.io/docs/configuration/terraform.html#specifying-required-provider-versions

Answer 2

For anyone finding this on a search engine, the answer by Nathan was correct in 2020, but setting a version constraint in a provider block is now deprecated.

The new recommended method is to set required_providers in a global configuration terraform block.

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "= 2.0"
    }
  }
}

If instead you want to pin to a major version and allow the minor version to increment, use the ~> operator, which allows only the rightmost version specified to increment. E.g. ~> 3.0 allows upgrade for any version in the 3.x space. More information can be found on the Version Constraints documentation.

See official documentation on provider requirements for more information.