Terraform Azure run bash script on VM - azure

Question

I'm trying to run a bash script on an Azure VM after deploying it with Terraform. I've tried different approaches but none of them have worked. With "custom_data", I assumed that the file will be uploaded and executed, however I'm not even seeing the file inside the VM.
I've also looked at "azurerm_virtual_machine_extension", but this does not give me the option to upload the file, only to execute commands or download from remote location (can't use fileUris due to requirements):
resource "azurerm_virtual_machine_extension" "test" {
name = "hostname"
location = "${azurerm_resource_group.test.location}"
resource_group_name = "${azurerm_resource_group.test.name}"
virtual_machine_name = "${azurerm_virtual_machine.test.name}"
publisher = "Microsoft.Azure.Extensions"
type = "CustomScript"
type_handler_version = "2.0"
settings = <<SETTINGS
{
"commandToExecute": "sh my_script.sh"
}
SETTINGS
tags = {
environment = "Production"
}
}
resource "azurerm_virtual_machine" "middleware_vm" {
name = "${var.middleware_vm}"
location = "${var.location}"
resource_group_name = "${azurerm_resource_group.middleware.name}"
network_interface_ids = ["${azurerm_network_interface.middleware.id}"]
vm_size = "Standard_DS4_v2"
storage_os_disk {
name = "centos_os_disk"
caching = "ReadWrite"
create_option = "FromImage"
managed_disk_type = "Premium_LRS"
}
storage_data_disk {
name = "managed_backup_disk"
create_option = "Empty"
caching = "ReadWrite"
disk_size_gb = "256"
managed_disk_type = "Premium_LRS"
lun = 0
}
storage_image_reference {
publisher = "OpenLogic"
offer = "CentOS"
sku = "7.5"
version = "latest"
}
os_profile {
computer_name = "${var.middleware_vm}"
admin_username = "middlewareadmin"
custom_data = "${file("scripts/middleware_disk.sh")}"
}

Answer 1

In azurerm_virtual_machine_extension, you can use:
protected_settings = <<PROTECTED_SETTINGS
{
"script": "${base64encode(file(var.scfile))}"
}
PROTECTED_SETTINGS
Please refer to my answer

Answer 2

First, the VM extension will just execute the script and do not copy the file to the VM. If you want to copy the script into the VM and then execute it. I will suggest you the Terraform provisioner file and remote-exec.
Here is the example that copies the file into the existing VM and executes the script:
resource "null_resource" "example" {
connection {
type = "ssh"
user = "azureuser"
password = "azureuser#2018"
host = "13.92.255.50"
port = 22
}
provisioner "file" {
source = "script.sh"
destination = "/tmp/script.sh"
}
provisioner "remote-exec" {
inline = [
"/bin/bash /tmp/script.sh"
]
}
}
Note: the script should be created in the current directory.