Renaming and moving things in Terraform

#Renaming a resource

Given...

resource "employee" "mike" {
  name = "Michael"
}

We want to change the resource name from "mike" to "michael".

First, we update the resource name.

resource "employee" "michael" {
  name = "Michael"
}

Next, we update the state.

terraform state mv employee.mike employee.michael

#Renaming a module

Given...

module "the_employer" {
  name = "Ferrari"
}

We want to change the module name from "the_employer" to "employer".

First, we update the module name.

module "employer" {
  name = "Ferrari"
}

Next, we update the state.

terraform state mv module.the_employer module.employer

#Moving multiple resources into a single resource

Given...

locals {
  names = [
    "Alain",
    "Jim",
    "Lewis"
  ]
}

resource "employee" "employee_1" {
  name = local.names[0]
}

resource "employee" "employee_2" {
  name = local.names[1]
}

resource "employee" "employee_3" {
  name = local.names[2]
}

We want to manage these similar objects via a single block.

First, we create a new resource block that leverages the count meta-argument.

locals {
  names = [
    "Alain",
    "Jim",
    "Lewis"
  ]
}

resource "employee" "employees" {
  count = length(local.names)
  name  = local.names[count.index]
}

Next, we update the state.

terraform state mv employee.employee_1 employee.employees[0]
terraform state mv employee.employee_2 employee.employees[1]
terraform state mv employee.employee_3 employee.employees[2]