CODEWITHSUNDEEP
azuretemplatesterraform
Nullpointer
Nullpointer

Reputation: 1950

How to use count condition on template in Terraform

In the belo code, I trying to fetch azure secret ( if exists) from keyvault and render it to generate template.

...
< Keyvault definition >

data "azurerm_key_vault_secret" "win_admin_pass" {
count = ${var.cnt} # either 0 and 1
name         = "vm-winpw"
key_vault_id = data.azurerm_key_vault.keyvault.id
}

data "template_files" "wininv"{
count = ${var.cnt} # either 0 and 1
template = file(ansible/inventory.tpl)
var = {
winpw = data.azurerm_key_vault.keyvault.id[count.index]
}
}

resource "local_file" "wininv" {
count = ${var.cnt} 
content = data.template_files.wininv[count.index]
filename = "ansible/inventory.cfg"

}

Here, I want fetch azure secret, if available on keyvault and generate template.

Without "count" code, its working well, but when secret is not available on azure that time getting error in Terraform. That stuff i have to control.

But with this code, getting below error:

Error: incorrect attributes value type
On test.tf in data template_files" "wininv":

66    var ={ 

inappropriate value for attribute string required vars: elements example : String required

Can you please suggest possible Syntex or any alternative solution for same.

Thanks

Upvotes: 0

Views: 671

Answers (2)

Chiamin
Chiamin

Reputation: 129

Conditional Expressions may solve your problem.

data "template_files" "wininv"{
  count = ${var.cnt} # either 0 and 1
  template = file(ansible/inventory.tpl)
  var = {
    winpw = ${var.cnt} == 0 ? "" : data.azurerm_key_vault.keyvault[count.index].id
  }
}

You need to use rendered attritube to get the rendered template. (doc)

resource "local_file" "wininv" {
  count = ${var.cnt} 
  content = data.template_files.wininv[count.index].rendered  # NOTICE rendered
  filename = "ansible/inventory.cfg"
}

Upvotes: 1

Marcin
Marcin

Reputation: 238111

template_file requires string only attributes. It should be:

winpw = data.azurerm_key_vault.keyvault[count.index].id

Also these days its recommended to use templatefile over template_file.

Upvotes: 1

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