Server resource: Availability Zone is mandatory / gets calculated as eu01-m

[mkesper]

Description

Availability Zone is marked as optional in server resource.
Not filling it will lead to calculated zone of eu01-m and result in server creation waiting: found non-GenericOpenApiError: create failed for server with id xxx: No valid host was found. There are not enough hosts available.

Steps to reproduce

terraform {
  required_providers {
    stackit = {
      source = "stackitcloud/stackit"
    }
  }
}

provider "stackit" {
  default_region = "eu01"
}


resource "stackit_server" "myhost" {
  project_id   = var.project_id
  machine_type = var.arm_1c_4gb
  name         = "myhost"
  boot_volume = {
    size        = 20
    source_type = "image"
    source_id   = var.debian_12_arm64
  }
}

1. tofu plan -out plan.out
2. tofu apply plan.out

Actual behavior

$ tofu plan -out plan.out
...
OpenTofu used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

OpenTofu will perform the following actions:

  # stackit_server.myhost will be created
  + resource "stackit_server" "myhost" {
      + availability_zone = (known after apply)
      + boot_volume       = {
          + delete_on_termination = (known after apply)
          + id                    = (known after apply)
          + size                  = 20
          + source_id             = "61443b25-97fc-4f5a-acd5-0645c3b1ed5d"
          + source_type           = "image"
        }
      + created_at        = (known after apply)
      + id                = (known after apply)
      + launched_at       = (known after apply)
      + machine_type      = "g1r.1d"
      + name              = "myhost"
      + project_id        = "xxx"
      + server_id         = (known after apply)
      + updated_at        = (known after apply)
    }

Plan: 1 to add, 0 to change, 0 to destroy.

─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Saved the plan to: plan.out

To perform exactly these actions, run the following command to apply:
    tofu apply "plan.out"

$ tofu apply plan.out
stackit_server.myhost: Creating...
╷
│ Error: Error creating server
│ 
│   with stackit_server.myhost,
│   on main.tf line 14, in resource "stackit_server" "myhost":
│   14: resource "stackit_server" "myhost" {
│ 
│ server creation waiting: found non-GenericOpenApiError: create failed for server with id 6d947931-xxx No valid
│ host was found. There are not enough hosts available.
╵

Expected behavior

• Require availability zone or
• Calculate single AZ available to server deployments

Environment

• OS: Debian GNU/Linux 13.2
• Terraform version (see terraform --version): OpenTofu v1.10.7
• Version of the STACKIT Terraform provider: v0.71.0

[mkesper]

Addition: Web console shows:

Name	Status	Betriebsstatus	Verfügbarkeitszonen	Private IP	Öffentliche IP
myhost	Fehler	Fehler	eu01-m		-

[marceljk]

Hi @mkesper,

thanks for reporting this issue. I could reproduce it, but this is an api issue and I'll forward it to the IaaS team.
That availability_zone is optional is correct. The api docs says the following:

This is the availability zone requested during server creation. If none is provided during the creation request and an existing volume will be used as boot volume it will be set to the same availability zone as the volume. For requests with no volumes involved it will be set to the metro availability zone.

I also tested it with an x86 machine type and there it works without any issues. So this issue probably relates only to specific machine types.

Best regards
Marcel from the STACKIT Developer Tools Team