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Reference External Disk Variables

Define Managed Disks

Define the managed_disks variable to create managed disks independently from any particular instance. These disks can be created without being attached to an instance. They can then be attached and detached as needed. 

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managed_disks = {
    test_disk_1 = {
        resource_group = "sharedinfra"
        zone = "2"
        storage_account_type = "Premium_LRS"
        disk_size_gb = "64"
    }
    test_disk_2 = {
        resource_group = "sharedinfra"
        zone = "2"
        storage_account_type = "Premium_LRS"
        disk_size_gb = "64"
    }
}

Attach Managed Disks to VMs

Use the external_disk attribute to attach one of the external managed disks to a VM. The managed disk must be in the same zone as the VM to be attached. 

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hsw = {
    names = [
        "HSW3TEST"
    ]
    size = "Standard_D2s_v4"
    virtual_machine_scale_set = "testvmss"
    resource_group = "hsw"
    nics = {
        primary = {
            ip_configuration = [{
                subnet = "main.hsw"
            }]
        }
    }
    disks = {
        disk1 = {
            lun = "0"
            storage_account_type = "Premium_LRS"
            disk_size_gb = "64"
        }
        disk2 = {
            lun = "1"
            external_disk = "test_disk_2"
        }
    }
}

The commands below can be used to get a list of managed disks and the keys that can be used to reference them. 

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terraform -chdir=src console -plan -var-file="../environments/yourenv.tfvars"
module.managed_disk.managed_disk