Terraform apply occasionally prompts for 'region' in aws provider

[Chris Burrell]

Hi

I'm new to Terraform but I have some kind of weird issue where running the same command, without any code changes, I sometimes get prompted to enter the 'region'  for the AWS provider and sometimes not.

Any ideas what might be happening.

Here's case 1:

$ terraform plan -var-file=terraform.tfvars

provider.aws.region

  The region where AWS operations will take place. Examples

  are us-east-1, us-west-2, etc.

  Default: us-east-1

  Enter a value:

Here's case 2:

$ terraform plan -var-file=terraform.tfvars

Refreshing Terraform state prior to plan...

The Terraform execution plan has been generated and is shown below.

Resources are shown in alphabetical order for quick scanning. Green resources

will be created (or destroyed and then created if an existing resource

exists), yellow resources are being changed in-place, and red resources

will be destroyed.

Note: You didn't specify an "-out" parameter to save this plan, so when

"apply" is called, Terraform can't guarantee this is what will execute.

+ module.network.vpc.aws_vpc.environment

    cidr_block:                "" => "10.0.0.0/16"

    default_network_acl_id:    "" => "<computed>"

    default_security_group_id: "" => "<computed>"

    dhcp_options_id:           "" => "<computed>"

    enable_classiclink:        "" => "<computed>"

    enable_dns_hostnames:      "" => "<computed>"

    enable_dns_support:        "" => "<computed>"

    main_route_table_id:       "" => "<computed>"

+ module.network.subnet.aws_subnet.private-subnet.0

    availability_zone:       "" => "us-west-1a"

    cidr_block:              "" => "10.0.0.0/21"

    map_public_ip_on_launch: "" => "0"

    tags.#:                  "" => "1"

    tags.Name:               "" => "private-us-west-1a-sn"

    vpc_id:                  "" => "${var.vpc_id}"

+ module.network.subnet.aws_subnet.private-subnet.1

    availability_zone:       "" => "us-west-1b"

    cidr_block:              "" => "10.0.8.0/21"

    map_public_ip_on_launch: "" => "0"

    tags.#:                  "" => "1"

    tags.Name:               "" => "private-us-west-1b-sn"

    vpc_id:                  "" => "${var.vpc_id}"

Plan: 3 to add, 0 to change, 0 to destroy.

I'm on windows (using a linux shell, but same occurs in a standard command prompt). I can provide the relevant fragments if required.

Just not sure what's helpful given the same issue doesn't happen all the time. Is this a bug?

Chris

[Justin Nauman]

By the looks of things, it may be this issue, which we ran into as well: https://github.com/hashicorp/terraform/issues/4865

We ended up just declaring the provider in the sub-modules for now. 

JRN 

[Paul Hinze]

We'll definitely get this fixed up. Just wanted to chime in with another workaround: each provider documents environment variables that can be used to configure it. If you use those variables it works around the nested module config inheritance bug.

Hope this helps!

Paul

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