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Terraform different approaches for variable assignment.

  1. Variable Defaults
  2. Command-line flags
  3. From a file
  4. Environment variables

1. Variable Default

variable "instance_type" {
default = "t2.micro"
}
variable "instance_type" {}
terraform plan
var.instance_type
Enter a value:

2. Command-line flags

terraform plan --var="instance_type=t2.small"

3. From a file

//terraform.tfvarsinstance_type="t2.micro"
terraform plan -var-file="custom.tfvars"
setx TF_VAR_instance_type t2.micro
export TF_VAR_instance_type t2.micro

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