compute_instance_v2: Make display name and hostname separately defineable and add description field.

[dschemp]

We have a use-case in which we want to set the systems hostname differently (FQDN) as is it shown in the management UI (without any domain). For now I have not seen any way to change the hostname besides changing the VMs name. And: as it seems the description field of the ECS cannot be set via the compute_instance_v2 resource but is set automatically (at least initially) to the VMs name.

We've tried setting it via the metadata variable and its propagated into the VM, but not applied and, by the looks of cloud init, set at the wrong spot for it to work.

resource "opentelekomcloud_compute_instance_v2" "vm" {
  name = "vm1"
  [...]
  metadata = {
    local-hostname = "vm1.example.org"
    hostname = "vm1.example.org"
  }
  [...]
}

[anton-sidelnikov]

Hi @dschemp, You can do it by passing user_data with cloud-init file:

resource "opentelekomcloud_compute_instance_v2" "my_server" {
  name              = "my-server"
  image_name        = "Standard_Debian_11_latest"
  availability_zone = "eu-de-01"
  flavor_id         = "s3.medium.1"
  key_pair          = "terraform-as"
  security_groups   = ["default"]

  user_data = file("cloud-init.yml")

  network {
    uuid = data.opentelekomcloud_vpc_subnet_v1.shared_subnet.network_id
  }
}

cloud-init.yml:

#cloud-config
hostname: new-hostname
fqdn: new-hostname.example.com
manage_etc_hosts: true

[anton-sidelnikov]

You can refer on openstack documentation in case of openstack API: https://registry.terraform.io/providers/terraform-provider-openstack/openstack/latest/docs/resources/compute_instance_v2#instance-with-user-data-cloud-init

[dschemp]

Ah, didn't know that. We thought you could only set the hostname (in a cloud-init way, and by that I don't mean runcmd or bootcmd) via the instances metadata (which we dont control) and not via the userdata. Great.

Is there any way to set the description of the ECS VM with TF?