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Many items in Terraform are supported in a first-class manner. However, sometimes you find an item not currently supported. In the case of Azure, we can specify absent Terraform provider functionality we need using ARM templates. It’s a bit more verbose to setup than a simple built-in property, but it works.
Here’s the code:
Assuming azurerm_app_service.app_service and azurerm_app_service_slot.app_service_slot are available (update this template as needed):
resource "azurerm_template_deployment" "app_service_auto_swap" {
name = "my-app-service-auto-swap"
resource_group_name = "YOUR_RESOURCE_GROUP_NAME"
deployment_mode = "Incremental"
template_body = "${file("./path/to/app-service-slot-auto-swap.json")}"
parameters {
"existingWebAppLocation" = "eastus"
"webAppName" = "${azurerm_app_service.app_service.name}"
"slotName" = "staging"
"autoSwapSlotName" = "production"
}
depends_on = [
"azurerm_app_service.app_service",
"azurerm_app_service_slot.app_service_slot"
]
}
app-service-slot-auto-swap.json
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"existingWebAppLocation": {
"type": "string",
"metadata": {
"description": "App location"
}
},
"webAppName": {
"type": "string",
"metadata": {
"description": "Example: app-name"
}
},
"slotName": {
"type": "string",
"metadata": {
"description": "Example: staging"
}
},
"autoSwapSlotName": {
"type": "string",
"metadata": {
"description": "Example: production"
}
}
},
"resources": [
{
"type": "Microsoft.Web/sites/slots",
"name": "[concat(parameters('webAppName'), '/', parameters('slotName'))]",
"apiVersion": "2015-08-01",
"location": "[parameters('existingWebAppLocation')]",
"properties": {
"siteConfig": {
"autoSwapSlotName": "[parameters('autoSwapSlotName')]"
}
}
}
]
}
