ibm_container_vpc_cluster.zones cannot be assigned a list from null_data_source

[ossm1db]

Terraform Version

Terraform v0.11.14

• provider.ibm v0.19.0
• provider.null v2.1.2

Affected Resource(s)

• ibm_container_vpc_cluster

Terraform Configuration Files

resource "ibm_is_vpc" "vpc" {
  name = "${var.cluster_name}-vpc"
  resource_group = "${var.resource_group_id}"
}

resource "ibm_is_subnet" "subnets" {
  count = "${var.zone_count}"
  name  = "${var.cluster_name}-subnet${count.index + 1}"
  vpc   = "${ibm_is_vpc.vpc.id}"
  zone  = "${var.region}-${count.index + 1}"
  total_ipv4_address_count = 256
}

data "null_data_source" "zones" {
  count  = "${var.zone_count}"
  inputs = {
    name      = "${var.region}-${count.index + 1}"
    subnet_id = "${element(ibm_is_subnet.subnets.*.id,count.index)}"
  }
}

output "zones" {
  value = "${data.null_data_source.zones.*.outputs}"
}

resource "ibm_container_vpc_cluster" "cluster" {
  name              = "${var.cluster_name}"
  vpc_id            = "${ibm_is_vpc.vpc.id}"
  flavor            = "c2.2x4"
  worker_count      = "1"
  resource_group_id = "${data.ibm_resource_group.resource_group.id}"
  zones             = "${data.null_data_source.zones.*.outputs}"
}

Expected Behavior

No errors.

Actual Behavior

Error: ibm_container_vpc_cluster.cluster: zones: should be a list

Steps to Reproduce

1. terraform plan

Important Factoids

Is the zones field a child block and not a standard attribute? See link below.

zones = [
    {
        name = us-south-1,
        subnet_id = 6ebec0b3-c081-44a2-98a1-8c6427372597
    },
    {
        name = us-south-2,
        subnet_id = 2d2907cb-d856-4122-a33c-57081ddd81ce
    }
]

References

• Provider will not take inputs from null resources

[hkantare]

zone is a list type. As per below issues https://github.com/terraform-providers/terraform-provider-null/issues/18 https://github.com/terraform-providers/terraform-provider-spotinst/issues/62#issuecomment-506493618

We can't use output from null_resource to set to zone(list)

[hkantare]

It may work in Terraform v0.12 by using dynamic blocks

[ossm1db]

Thanks for the quick response. I was thinking that one of two solutions might be possible:

• create the zones as a separate resource and pass them to the cluster during creation as a list of resources instead of a list of maps, or
• provide a single zone to the cluster during creation and add the others in a separate step similar to the way zones can be added by the CLI with ibmcloud ks zone add vpc-classic

[hkantare]

closing the issue due to no recent activity. Please feel free to open new issue