reference modules: config: unknown module referenced

[xueshanf]

I am trying to make module references between two subfolders to work, but could not get it to work. I might have missed something really simple.

There is simplified setup:

%terraform get
Get: file:///Users/..../projects/vpc
Get: file:///Users/..../projects/etcd

Under projects (root level), main.cf

 module "vpc" {
   source = "./vpc"
}
module "etcd" {
   source = "./etcd"
}

Subfolder ./vpc/subnet-etcd.tf, in addition to an empty main.cf:

resource "aws_subnet" "docker-etcd-a" {
    vpc_id = ....
    cidr_block = ...
}
output "docker_etcd_a" {
  value = "${aws_subnet.docker-etcd-a.id}"
}

Subfolder ./etcd/etcd-a-01.tf

resource "aws_instance" "etcd-a-01" {
    ami = ...
    instance_type = ..
    subnet_id = "${module.vpc.docker_etcd_a}"
}

%terraform plan --module-depth=-1

There are warnings and/or errors related to your configuration. Please
fix these before continuing.

Errors:

• module etcd.root: 1 error(s) occurred:
• resource 'aws_instance.etcd-a-01' config: unknown module referenced: vpc

Any ideas what's wrong with the setup? Thanks!

[zdexter]

I have the same issues when using an AWS EIP public_ip output to fill a cloudflare record. The former is one folder deeper than the root, and the latter is also one folder deeper than the root, in a different module. So basically the same setup as the OP.

[mitchellh]

Hi @xueshanf! This looks to be working as intended: you can only reference modules that are defined within your own module scope. It looks like the etcd module is trying to access the vpc module which was defined in the root module. This can't happen. You'll have to pass in the VPC ID as a parameter to the module. HTH!

[xueshanf]

Got it. Thanks. I used a script to generate tf vars from the output of the vpc's module so they are available to other modules.

Xueshan

On Feb 17, 2015, at 13:26, Mitchell Hashimoto [email protected] wrote:

Hi @xueshanf! This looks to be working as intended: you can only reference modules that are defined within your own module scope. It looks like the etcd module is trying to access the vpc module which was defined in the root module. This can't happen. You'll have to pass in the VPC ID as a parameter to the module. HTH!

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