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Root Module : main.tf​

# **** MAP
variable "MAP_1" {
  type = map(string)
  default = {
    keyA = "ValueA"
    keyB = "ValueB"
    keyC = "ValueC"
  }
}

output "OUT_MAP_1" {
  value = var.MAP_1["keyC"]
}

output "OUT_MAP_1_ALL_VALUES" {
  value = var.MAP_1
}

# **** MAP, but now per Element in the Map
module "MAP_PER_ELEMENT" {
  source          = "./module_map_element"
  for_each        = var.MAP_1
  mapElementKey   = each.key
  mapElementValue = each.value
}

output "MODULE_MAP_ELEMENT_OUTPUT" {
  value = module.MAP_PER_ELEMENT
}

resource "null_resource" "this" {
  for_each = var.MAP_1
  xx = each.key
}

# **** LIST
variable "LIST_1" {
  type = list(string)
  default = [
    "ValueA",
    "ValueB",
    "ValueC"
  ]
}

output "OUT_LIST_1_INDEX_2" {
  value = var.LIST_1[2]
}

output "OUT_LIST_1_ALL_VALUES_IN_A_FOR" {
  value = [for i in var.LIST_1 : i]
}

output "OUT_LIST_1_ALL_VALUES" {
  value = var.LIST_1
}

# **** LIST, but now per element in the list
module "MODULE_LIST" {
  source       = "./module_list_element"
  count        = length(var.LIST_1)
  LIST_ELEMENT = var.LIST_1[count.index]
}

output "MODULE_LIST_ELEMENT_OUTPUT" {
  value = module.MODULE_LIST
}
output "MODULE_LIST_ELEMENT_OUTPUT_SECOND_VALUE" {
  value = module.MODULE_LIST[2].MODULE_LIST_ELEMENT_OUTPUT
}
output "MODULE_LIST_ELEMENT_OUTPUT_ALL_IN_LIST" { # Return all values in a list
  value = module.MODULE_LIST[*].MODULE_LIST_ELEMENT_OUTPUT
}


# **** LIST of Maps
variable "LIST_OF_MAPS" {
  type = list(map(string))
  default = [
    {
      city = "Amsterdam"
      country = "Netherlands"
    },
    {
      city = "New York"
      country = "United States of America"
    },
    {
      city = "London"
      country = "United Kingdom"
    }
  ]
}

# ** Get 'country' of second element
output "LISTMAP_COUNTRY_OF_ELEMENT_2" {
  value = var.LIST_OF_MAPS[1].country
}
output "LISTMAP_ALL_COUNTRIES_1" {
  value = [for i in var.LIST_OF_MAPS: i.country]
}
output "LISTMAP_ALL_COUNTRIES_2" {
  value = var.LIST_OF_MAPS.*.country
}

# ** LIST of MAPS in a Module
module "LIST_OF_MAPS" {
  source = "./module_listofmap"
  count = length(var.LIST_OF_MAPS)
  LISTOFMAP_ELEMENT = var.LIST_OF_MAPS[count.index]
}

output "ALL_COUNTRIES" {
  value = module.LIST_OF_MAPS[*].COUNTRY
}

module_list_element/main.tf​

variable "LIST_ELEMENT" {
  type = string
}

output "MODULE_LIST_ELEMENT_OUTPUT" {
  value = var.LIST_ELEMENT
}

module_map_element/main.tf​

variable "mapElementKey" {
  type = string
}

variable "mapElementValue" {
  type = string
}

output "MODULE_MAP_ELEMENT_OUTPUT" {
  value = "${var.mapElementKey} = ${var.mapElementValue}"
}

module_listofmap/main.tf​

variable "LISTOFMAP_ELEMENT" {
  type = map(string)
}

output "COUNTRY" {
  value = var.LISTOFMAP_ELEMENT.country
}

Deployment​

  • Create new directory
$ mkdir terraformlistandmap
$ cd terraformlistandmap
  • Create file main.tf in that directory
  • create subdirectories for the modules
$ mkdir module_listofmap module_map_element module_list_element
  • Create all the main.tf files in those subdirectories
  • run terraform init
$ terraform init
  • apply the configuration and see the output
$ terraform apply --auto-aprove