Terraform error while fetching value of subnet in oci - terraform

Question

I have this code where I am trying to fetch the id of subnet via subnet name:
The code looks like this :
resource "oci_containerengine_node_pool" "node_pool" {
for_each = var.nodepools
cluster_id = oci_containerengine_cluster.cluster[0].id
compartment_id = var.compartment_id
depends_on = [oci_containerengine_cluster.cluster]
kubernetes_version = var.cluster_kubernetes_version
name = each.value["name"]
node_config_details {
placement_configs {
availability_domain = var.availability_domain
subnet_id = oci_core_subnet.snet-workers[each.value.subnet_name].id
}
size = each.value["size"]
}
node_shape = each.value["node_shape"]
node_shape_config {
#Optional
memory_in_gbs = each.value["memory"]
ocpus = each.value["ocpus"]
}
node_source_details {
image_id = each.value["image_id"]
source_type = "IMAGE"
}
ssh_public_key = file(var.ssh_public_key_path)
}
My subnet code looks like:
resource "oci_core_subnet" "snet-workers" {
cidr_block = lookup(var.subnets["snet-workers"], "subnet_cidr")
compartment_id = var.compartment_id
vcn_id = oci_core_virtual_network.base_vcn.id
display_name = lookup(var.subnets["snet-workers"], "display_name")
dns_label = lookup(var.subnets["snet-workers"], "dns_label")
prohibit_public_ip_on_vnic = true
security_list_ids = [oci_core_security_list.private_worker_nodes.id]
route_table_id = oci_core_route_table.rt-nat.id
}
variables looks like:
variable "subnets" {
description = "List of subnets to create for an environment"
type = map(object({
subnet_cidr = string
display_name = string
dns_label = string
}))
}
my tfvars looks like
nodepools = {
np1 = {
name = "np1"
size = 3
ocpus = 8
memory = 120
image_id = "test"
node_shape = "VM.Standard2.8"
subnet_name = "snet-worker1"
}
np2 = {
name = "np2"
size = 2
ocpus = 8
memory = 120
image_id = "test"
node_shape = "VM.Standard2.8"
subnet_name = "snet-worker2"
}
}
But in terraform plan I am getting error as
Error: Invalid index
│
│ on ../modules/oke/oke.tf line 39, in resource "oci_containerengine_node_pool" "node_pool":
│ 39: subnet_id = oci_core_subnet.snet-workers[each.value.subnet_name].id
│ ├────────────────
│ │ each.value.subnet_name is "snet-worker2"
│ │ oci_core_subnet.snet-workers is object with 22 attributes
│
│ The given key does not identify an element in this collection value.
╵
╷
│ Error: Invalid index
│
│ on ../modules/oke/oke.tf line 39, in resource "oci_containerengine_node_pool" "node_pool":
│ 39: subnet_id = oci_core_subnet.snet-workers[each.value.subnet_name].id
│ ├────────────────
│ │ each.value.subnet_name is "snet-worker1"
│ │ oci_core_subnet.snet-workers is object with 22 attributes
│
│ The given key does not identify an element in this collection value.
Can someone help

Answer 1

The following:
subnet_id = oci_core_subnet.snet-workers[each.value.subnet_name].id
would only work if you had used for_each while creating oci_core_subnet.snet-workers. Since you are not using for_each, it should be:
subnet_id = oci_core_subnet.snet-workers.id
UPDATE
To keep using original version:
resource "oci_core_subnet" "snet-workers" {
for_each = var.subnets
cidr_block = each.value["subnet_cidr"]
compartment_id = var.compartment_id
vcn_id = oci_core_virtual_network.base_vcn.id
display_name = leach.value[""display_name"]
dns_label = each.value["dns_label"]
prohibit_public_ip_on_vnic = true
security_list_ids = [oci_core_security_list.private_worker_nodes.id]
route_table_id = oci_core_route_table.rt-nat.id
}

Answer 2

You have to define a "oci_core_subnet" for each entry in "subnets" variable. Something like this:
resource "oci_core_subnet" "snet-workers" {
for_each = var.subnets
cidr_block = each.value.subnet_cidr
...
}