I originally posted this on Stack Overflow because I was not aware of this forum.
I have created a module with the following
resource "aci_ranges" "add_vlan" {
for_each = local.vlan_list
alloc_mode = each.value["alloc_mode"]
annotation = each.value["annotation"]
name_alias = each.value["name_alias"]
vlan_pool_dn = each.value["vlan_pool"]
role = each.value["role"]
from = "vlan-${each.value["from"]}"
to = "vlan-${each.value["to"]}"
}
From Here I have defined a variables file to make it so users don’t have to enter every variable… they can accept defaults
terraform {
experiments = [module_variable_optional_attrs]
}
variable "vlan_list" {
description = "Add VLANs to VLAN Pools"
type = map(object({
alloc_mode = optional(string)
annotation = optional(string)
from = optional(number)
name_alias = optional(string)
role = optional(string)
to = optional(number)
vlan_pool = optional(string)
}))
}
locals {
vlan_list = {
for k, v in var.vlan_list : k => {
alloc_mode = coalesce(v.alloc_mode, "static")
annotation = (v.annotation != null ? v.annotation : "")
from = (v.from != null ? v.from : 1)
name_alias = (v.name_alias != null ? v.name_alias : "")
role = coalesce(v.role, "external")
to = coalesce(v.to, 1)
vlan_pool = (v.vlan_pool != null ? v.vlan_pool : "")
}
}
}
Here is what a user would enter then to consume the module (note that I know the for statements are not correct at all but are just a reference to what I would like to accomplish):
module "vlan_list" {
depends_on = [module.vlan_pools]
source = "../modules/add_vlans"
vlan_list = {
for i in range(1, 100):
"access" => {
vlan_pool = module.vlan_pools.vlan_pool["access"]
from = i
to = i
}...
for i in ranges([1000-1200], [1300-1400]):
"vmm_dynamic" => {
alloc_mode = "dynamic"
vlan_pool = module.vlan_pools.vlan_pool["vmm_dynamic"]
from = i
to = i
}...
for i in list[4, 100, 101]:
"l3out" => {
vlan_pool = module.vlan_pools.vlan_pool["l3out"]
from = i
to = i
}...
}
}
When the resource creates the entries, from the API, if I do it in a range as shown below it can be problematic. In example; if someone needed to change the range for the first pool (in example) to 1-50,52-99, it would delete the entire VLAN range and then re-create it. whereas if they are creating the entry with each entry being created individually via a range loop then they can delete individual entries without affecting the entire pool.
I can do the following and it works fine… but as mentioned above; being able to add the VLANs individually from a loop would be preferable.
module "vlan_list" {
depends_on = [module.vlan_pools]
source = "../modules/add_vlans"
vlan_list = {
"access" = {
vlan_pool = module.vlan_pools.vlan_pool["access"]
from = 1
to = 99
},
"vmm_dynamic" = {
alloc_mode = "dynamic"
vlan_pool = module.vlan_pools.vlan_pool["vmm_dynamic"]
from = 1000
to = 1199
},
"l3out_1" = {
vlan_pool = module.vlan_pools.vlan_pool["l3out"]
from = 4
to = 4
},
"l3out_2" = {
vlan_pool = module.vlan_pools.vlan_pool["l3out"]
from = 100
to = 101
},
}
}
Thanks in advance for help on this.