Terraform lookup function

Terraform lookup function retrieves the value of a single element from a map, given its key.

• https://www.terraform.io/language/functions/lookup

lookup(map, key, default)

Examples

variable "candy_list" {
  type = list(string)
  default = ["snickers", "kitkat", "reeces", "m&ms"]
}
 
output "give_me_candy" {
  value = "${lookup(var.candy_list, 2)}"
}

resource "aws_instance" "my-instance" {
 count         = var.instance_count
 ami           = lookup(var.ami,var.aws_region)
 instance_type = var.instance_type
 key_name      = aws_key_pair.terraform-demo.key_name
 user_data     = file("install_apache.sh") 

 tags = {
   Name  = "Terraform-${count.index + 1}"
   Batch = "5AM"
 }
}

Related

• Terraform Associate cheatsheet
• Ansible lookup plugins
• Terraform: dynamic blocks

See also

• Terraform functions, Terraform collection functions: tolist, toset, length, sum, file, join, depends_on, zipmap, replace, lookup, read files, concat, merge, templatefile, for_each, format, element, slice, try, filebase64, upper, filemd5, coalesce, formatlist, flatten, sensitive, tonumber, jsondecode, yamldecode, pathexpand