Should be able to manually add instances to a google_compute_instance_group

[oppegard]

Terraform Version

0.9.6

Affected Resource(s)

• google_compute_instance_group

Terraform Configuration Files

resource "google_compute_instance_group" "solr_cloud" {
  name = "solr-central1-a"
  zone = "us-central1-a"
}

Expected Behavior

After manually adding VMs to the Instance Group, no diff is shown when running terraform plan.

Actual Behavior

Terraform plans to remove the manually-added VMs on the google_compute_instance_group. Example output:

~ google_compute_instance_group.solr_cloud
    instances.#:          "1" => "0"
    instances.3628955265: "https://www.googleapis.com/compute/v1/projects/production-services/zones/us-central1-a/instances/solr-dummy-instance" => ""

Steps to Reproduce

1. Create an Instance Group per the Terraform Config File above via terraform apply
2. Manually add a VM to the Instance Group
3. Run terraform plan and see that it plans to remove the instance

Important Factoids

We are using BOSH to provision the VMs and add them to the terraformed google_compute_instance_group, using the BOSH Google CPI option backend_service.

We currently accomplish the same setup on AWS using the aws_elb terraform resource, with BOSH creating the VMs and attaching them to the ELB.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.