Reference map in locals in terraform file

Question

In a tvfars file I have this:

locals {common = {"my key" = "value"}}

because I want to use the map in multiple places in that file. I read the terraform docs about variables and I cannot find the correct syntax. I tried the following (var1 and 2 are both declared as maps):

With

var1 = "${local.common}"var2 = "${local.common}"

I get

variable "var1" should be type map, got string

With

var1 = locals.commonvar2 = locals.common

I get

invalid value "myfile.auto.tfvars" for flag -var-file-default: Error parsing myfile.auto.tfvars: At 18:15: Unknown token: 18:15 IDENT locals.common

With
```
var1 = {"${local.common}"}var2 = {"${local.common}"}
```
which fails without an error message but a print of terraform help and terraform exits.

I verified that everything works fine if I copy/paste the map multiple times:

var1 = {"my key" = "value"}var2 = {"my key" = "value"}

Anyone know correct syntax?

Best Answer

Accepted Answer

local blocks,interpolations and expressions that are not constants cannot be used in terraform.tfvars file.

See github-issue for further dicussion

The way around is to define the variable only once in terraform.tfvars and make the duplicate variables local in the terraform module file.

Example:

variable.tf

variable var1 {type = "map"}

terraform.tfvars

var1= {"key1" = "value1","key2" = "value2"}

module.tf

 locals { var2="${var.var1}" } output show_var2 {value = "${local.var2}"}

Reference map in locals in terraform file

Best Answer

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