Error: Invalid Index, is empty tuple, The given key does not identify an element in this collection value

Terraform
1

Hi I am working on terrafrom verion 0.14.5 and facing error of Invalid Index followed by empty tuple. This is my code.

resource “azurerm_lb” “lb_app_primary” {
count = var.instances_count >= 1 ? 1 : 0
name = “LB1”
sku = “standard”
location = var.location
resource_group_name = var.resourcegroup
}

resource “azurerm_lb_probe” “lb_sql_probe_primary” {
resource_group_name = var.resourcegroup
loadbalancer_id = azurerm_lb.lb_sql_primary[0].id
name = “SQLEndPointProbe”
port = 1433
interval_in_seconds = 10
number_of_probes = 3
}

Variable var.instances_count is of type number.

When initial value of var.instances_count is set to 0 in relevant tfvars file and I execute terraform plan -var-file=setenv.tfvars it fails with below error.

Error: Invalid index

** on modules\CMS\loadbalancers.tf line 176, in resource “azurerm_lb_probe” “lb_sql_probe_primary”:**
** 176: loadbalancer_id = azurerm_lb.lb_sql_primary[0].id**
** |----------------**
** | azurerm_lb.lb_sql_primary is empty tuple**

The given key does not identify an element in this collection value.

When initial value of var.instances_count is set to 1 in relevant tfvars file and I execute terraform plan -var-file=setenv.tfvars, everything works fine and the plan is executed.

I have a requirement to make var.instances to 0 in the tfvars file and terraform plan should execute because we don’t need certain resources to be created for every environment.

I have explored earlier posts with this forum and also tried to apply the solutions provided there but nothing has worked so far. Can you please suggest how do I eliminate this error and have my plan executed with valur ‘0’ in tfvars file.

2

You’d have to also create this resource conditionally. So, e.g. you have to add the same count parameter.