Retrieve IP address from instances using for_each - terraform

Question

I have this script which works great. It created 3 instances with the sepcified tags to identify them easily. But issue is i want to add a remote-exec provisioner (currently commented) to the code to install some packages. If i was using count, i could have looped over it to do the remote-exec over all the instances. I could not use count because i had to use for_each to loop over a local list. Since count and for_each cannot be used together, how do i loop over the instances to retrieve their IP addresses for using in the remote-exec provisioner.
On digital ocean and AWS, i was able to get it work using host = "${self.public_ip}"
But it does not work on vultr and gives the Unsupported attribute error
instance.tf
resource "vultr_ssh_key" "kubernetes" {
name = "kubernetes"
ssh_key = file("kubernetes.pub")
}
resource "vultr_instance" "kubernetes_instance" {
for_each = toset(local.expanded_names)
plan = "vc2-1c-2gb"
region = "sgp"
os_id = "387"
label = each.value
tag = each.value
hostname = each.value
enable_ipv6 = true
backups = "disabled"
ddos_protection = false
activation_email = false
ssh_key_ids = [vultr_ssh_key.kubernetes.id]
/* connection {
type = "ssh"
user = "root"
private_key = file("kubernetes")
timeout = "2m"
host = vultr_instance.kubernetes_instance[each.key].ipv4_address
}
provisioner "remote-exec" {
inline = "sudo hostnamectl set-hostname ${each.value}"
} */
}
locals {
expanded_names = flatten([
for name, count in var.host_name : [
for i in range(count) : format("%s-%02d", name, i + 1)
]
])
}
provider.tf
terraform {
required_providers {
vultr = {
source = "vultr/vultr"
version = "2.3.1"
}
}
}
provider "vultr" {
api_key = "***************************"
rate_limit = 700
retry_limit = 3
}
variables.tf
variable "host_name" {
type = map(number)
default = {
"Manager" = 1
"Worker" = 2
}
}

Answer 1

The property you are looking for is called main_ip instead of ip4_address or something like that. Specifically accessible via self.main_ip in your connection block.