Forcing update of Azure function zip package during terraform deployment

Question

I'm trying to deploy an azure function via terraform and everytime I update code & create a new zip file and run terraform apply locally, it doesn't register the change and shows nothing to update. I thought using the hash() function inside the appsettings of the function app like below, should have been enough to detect changes to the zip folder and force the redeployment. What changes can I make to allow force update everytime the zip file changes. Also is there a way to allow force deployment of a resource regardless of any changes in terraform state?

resource "azurerm_storage_blob" "app" {
  name = "${var.storageblobname}"
  storage_account_name  = "${azurerm_storage_account.app.name}"
  storage_container_name = "${azurerm_storage_container.app.name}"
  type   = "Block"
  source = "./../functionapp.zip"
}



resource "azurerm_function_app" "app" {
    name                      = "${var.appname}"
    location                  = "${azurerm_resource_group.app.location}"
    resource_group_name       = "${azurerm_resource_group.app.name}"
    app_service_plan_id       = "${azurerm_app_service_plan.app.id}"
    storage_connection_string = "${azurerm_storage_account.app.primary_connection_string}"    
    identity {
        type  = "SystemAssigned"
    }
    version = "~3"

    app_settings    =   "${merge(var.appsettings,
                                map("APPINSIGHTS_INSTRUMENTATIONKEY", "${azurerm_application_insights.app.instrumentation_key}",
                                    "FUNCTIONS_WORKER_RUNTIME", "powershell",
                                    "FUNCTION_APP_EDIT_MODE",  "readonly",
                                    "https_only",  true,
                                    "HASH",  "${filebase64sha256("./../functionapp.zip")}",
                                    "WEBSITE_RUN_FROM_PACKAGE", "https://${azurerm_storage_account.app.name}.blob.core.windows.net/${azurerm_storage_container.app.name}/${azurerm_storage_blob.app.name}${data.azurerm_storage_account_sas.app.sas}"
                                    ))}"
}

Nancy Xiong Nancy Xiong · Accepted Answer · 2020-07-30T09:02:12

I'm trying to deploy an azure function via terraform and everytime I update code & create a new zip file and run terraform apply locally, it doesn't register the change and shows nothing to update.

The terraform engine works based on the configuration files. If you want to reflect on the change of the zip file in the Azure function. I suggest creating a .zip file with a new name which is different than the old one, then the terraform plan will detect changes to the zip folder and force the redeployment.

If you are interested, you can read Zero Downtime Updates with HashiCorp Terraform.

Forcing update of Azure function zip package during terraform deployment

1 Answers