Skip to content

Instantly share code, notes, and snippets.

@OlegGorj

OlegGorj/terraform-map-variable.tf

Last active March 26, 2024 14:46
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save OlegGorj/aae6dac914d5a1ea9ab1d78907bd4f1a to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save OlegGorj/aae6dac914d5a1ea9ab1d78907bd4f1a to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. OlegGorj revised this gist Nov 5, 2023. No changes.
  2. OlegGorj created this gist May 28, 2022.
    66 changes: 66 additions & 0 deletions terraform-map-variable.tf
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,66 @@
    Example 1
    ===============================
    Maps are a way to create variables that are lookup tables. An example will show this best. Let's extract our AMIs into a map and add support for the us-west-2 region as well:

    variable "amis" {
    type = "map"
    default = {
    "us-east-1" = "ami-b374d5a5"
    "us-west-2" = "ami-4b32be2b"
    }
    }

    A variable can have a map type assigned explicitly, or it can be implicitly declared as a map by specifying a default value that is a map. The above demonstrates both.

    Then, replace the aws_instance with the following:
    resource "aws_instance" "example" {
    ami = var.amis[var.region]
    instance_type = "t2.micro"
    }

    Example 2
    ===============================
    variable "plans" {
    type = "map"
    default = {
    "5USD" = "1xCPU-1GB"
    "10USD" = "1xCPU-2GB"
    "20USD" = "2xCPU-4GB"
    }
    }
    plan = "${var.plans["5USD"]}"

    The values matching to their keys can also be used to look up information in other maps. For example, underneath is a short list of plans and their corresponding storage sizes.
    variable "storage_sizes" {
    type = "map"
    default = {
    "1xCPU-1GB" = "25"
    "1xCPU-2GB" = "50"
    "2xCPU-4GB" = "80"
    }
    }
    These can then be used to find the right storage size based on the monthly price as defined in the previous example.

    size = "${lookup(var.storage_sizes, var.plans["5USD"])}"

    variable "set_password" {
    default = false
    }

    Example 3
    ===============================
    # Use Case of for_each

    variable "account_name" {
    type = "map"
    default = {
    "account1" = "devops1"
    "account2" = "devops2"
    "account3" = "devops3"
    }
    }
    resource "aws_iam_user" "iamuser" {
    for_each = var.account_name
    name = "${each.value}-iam"
    }