The Admin Username specified is not allowed.

Log
Error : compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 – Original Error: Code=“InvalidParameter” Message=“The Admin Username specified is not allowed.” Target="adminUsername"

Azure(azurerm) 프로바이더를 사용하여 Virtual Machine을 프로비저닝하는 경우 OSProfile에서 Admin User Name을 잘못된 조건으로 구성하는 경우 발생 할 수 있음

Azure API - OSProfile.AdminUsername Property

https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.management.compute.models.osprofile.adminusername?view=azure-dotnet

Azure의 API에서 정의하는 OSProfile 내의 AdminUsername은 온라인 문서에서처럼 몇가지 룰이 있다.

• Windows VM 제약
  • . 으로 끝날 수 없음
  • 20자 제한
• Linux VM 제약
  • 1~64자
• 다음의 이름은 AdminUser로 허용되지 않음
  • administrator
  • adm
  • admin
  • admin1
  • admin2
  • user
  • user1
  • user2
  • user3
  • user4
  • user5
  • test
  • test1
  • test2
  • test3
  • 1
  • 123
  • a
  • actuser
  • aspnet
  • backup
  • console
  • david
  • guest
  • john
  • owner
  • root
  • server
  • sql
  • support
  • support_388945a0
  • sys

Terraform Error Code Sample

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/virtual_machine

resource "azurerm_virtual_machine" "main" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = [azurerm_network_interface.main.id]
  vm_size               = "Standard_DS1_v2"

  storage_image_reference {
    publisher = "Canonical"
    offer     = "UbuntuServer"
    sku       = "16.04-LTS"
    version   = "latest"
  }
  storage_os_disk {
    name              = "myosdisk1"
    caching           = "ReadWrite"
    create_option     = "FromImage"
    managed_disk_type = "Standard_LRS"
  }
  os_profile {
    computer_name  = "hostname"
    admin_username = "test"
    admin_password = "Password1234!"
  }
  os_profile_linux_config {
    disable_password_authentication = false
  }
  tags = {
    environment = "staging"
  }
}