Get Subnets from Bridge Domain DN

[mingjliu9]

Description

I want to get subnets with bridge domain/EPG dn as input parameter, so that my terraform module could work well to pass subnets as input parameter to other terraform resources.

New or Affected Resource(s) + ACI Class(es):

New data source expected:
aci_egp_subnets
or
aci_bd_subnets

APIC version and APIC Platform

• V 4.2(7I) and on-prem/cloud-aws/cloud-azure/all.

Potential Terraform Configuration

# Copy-paste your Terraform configurations here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key.
data aci_bd_subnets "my_subnets" {
  parent_dn         = "${aci_bridge_domain.example.id}"
}

resource myprovider_myresource example {
  subnets = data.aci_bd_subnets.my_subnets
}

[akinross]

HI @mingjliu9,

We currently do not support class querying in the data sources or expose the fvSubnet as part of the parent resource/datasource. You could leverage aci_rest datasource for your described scenario. See example below where you would need to set "parent_dn_bd" and "parent_dn_epg" to respective parent DNs that you would like to query.

locals {
  parent_dn_bd = "uni/tn-abr_tenant/BD-abr_bd.json"
  parent_dn_epg = "uni/tn-abr_tenant/ap-abr_ap/epg-abr_epg.json"
}

data "aci_rest" "bd_subnets" {
  path       = "api/mo/${local.parent_dn_bd}?rsp-subtree=children&rsp-subtree-class=fvSubnet"
}

data "aci_rest" "epg_subnets" {
  path       = "api/mo/${local.parent_dn_epg}?rsp-subtree=children&rsp-subtree-class=fvSubnet"
}

locals {
  bd_subnets = [for child in tolist(data.aci_rest.bd_subnets.children) : child.child_content.ip]
  epg_subnets = [for child in tolist(data.aci_rest.epg_subnets.children) : child.child_content.ip]
}

output "bd_subnets" {
  value = local.bd_subnets
}

output "epg_subnets" {
  value = local.epg_subnets
}

The output would look like example below.

bd_subnets = [
  "1.1.1.1/24",
  "1.1.2.1/24",
  "1.1.3.1/24",
]
epg_subnets = [
  "2.1.1.1/32",
  "2.1.2.1/32",
]

[lhercot]

@mingjliu9 does Akini's answer fixed your issue?

[akinross]

Hi @mingjliu9,

I have added a new issue as seen above to create more generic HCL examples for our resources. Will proceed with closure. In case you have additional questions please let us know. Also if you have other use-cases that you feel should be part of the generic guides feel free to comment on the raised issue.