Extract Key/Values from Terraform Map Variable

I am trying to extract both left and right values from the terraform map variable but couldn't extract the left value. Below is my code :-

variables.tf variable "notebook" { type = "map" default = { "01" = "[email protected]" "02" = "[email protected]" "03" = "[email protected]" "04" = "[email protected]" ...... }
}

Below is my module in main.tf

 module "instance" { instance_ip = ["1.1.1.x", "1.1.2.y", "1.1.1.z","1.1.2.p"] dns = ["x", "y", "z","p"] name = ["a", "b", "c", "d"] }

The output should be as below :-

 module "instance" { instance_ip = ["1.1.1.01", "1.1.2.02", "1.1.1.03","1.1.2.04" and so on] dns = ["01", "02", "03","04" and so on] name = ["[email protected]", "[email protected]", "[email protected]", "[email protected] and so on] }

Any suggestions. I tried lookup on variable but getting only the [email protected] and not the Key's.

1 Answer

You can use the keys and values functions for this:

# terraform 0.12
module "instance" { instance_ip = ["1.1.1.${keys(var.notebook)[0]}", "1.1.1.${keys(var.notebook)[1]}", "1.1.1.${keys(var.notebook)[2]}"] dns = keys(var.notebook) name = values(var.notebook)
}
# terraform 0.11
module "instance" { instance_ip = ["1.1.1.${keys(var.notebook)[0]}", "1.1.1.${keys(var.notebook)[1]}", "1.1.1.${keys(var.notebook)[2]}"] dns = ["${keys(var.notebook)}"] name = ["${values(var.notebook)}"]
}