How to make a FunctionApp setting slotSpecific using ARM templates - azure-devops

Question

We are using ARM templates to deploy function apps but the slotSetting: true property is not respected and I cannot find any modern documentation as to how to make app settings slot specific.
THis is my app settings snippet in my ARM template
{
"name": "AzureWebJobs.HandleFiscalFrResponse.Disabled",
"value": "1",
"slotSetting": true
}
the setting and the value works but the slotSettings attribute is ignored silently, no error is shown its just ignored.
What is the correct way to make a function app setting slot specific?

Answer 1

I have reproduced the issue and able to resolve, please follow the below steps
Open VS code and create a file using .json extension and se the below code
Thanks #patelchandni for the ARM Template code.
My Filename.json
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"functionAppName": {
"type": "string",
"defaultValue": "[format('tar-{0}', uniqueString(resourceGroup().id))]"
},
"storageAccountType": {
"type": "string",
"defaultValue": "Standard_LRS",
"allowedValues": [
"Standard_LRS",
"Standard_GRS",
"Standard_RAGRS"
]
},
"location": {
"type": "string",
"defaultValue": "[resourceGroup().location]"
},
"appInsightsLocation": {
"type": "string",
"defaultValue": "[resourceGroup().location]"
},
"functionWorkerRuntime": {
"type": "string",
"defaultValue": "node",
"allowedValues": [
"dotnet",
"node",
"python",
"java"
]
},
"functionPlanOS": {
"type": "string",
"defaultValue": "Windows",
"allowedValues": [
"Windows",
"Linux"
]
},
"functionAppPlanSku": {
"type": "string",
"defaultValue": "EP1",
"allowedValues": [
"EP1",
"EP2",
"EP3"
]
},
"linuxFxVersion": {
"type": "string",
"defaultValue": "",
"metadata": {
"description": "Only required for Linux app to represent runtime stack in the format of 'runtime|runtimeVersion'. For example: 'python|3.9'"
}
}
},
"variables": {
"hostingPlanName": "[parameters('functionAppName')]",
"applicationInsightsName": "[parameters('functionAppName')]",
"storageAccountName": "[concat(uniquestring(resourceGroup().id), 'azfunctions')]",
"isReserved": "[if(equals(parameters('functionPlanOS'), 'Linux'), true(), false())]",
"slotContentShareName": "[concat(parameters('functionAppName'), '-deployment')]"
},
"resources": [
{
"type": "Microsoft.Storage/storageAccounts",
"apiVersion": "2021-02-01",
"name": "[variables('storageAccountName')]",
"location": "[parameters('location')]",
"sku": {
"name": "[parameters('storageAccountType')]"
},
"kind": "Storage"
},
{
"type": "Microsoft.Web/serverfarms",
"apiVersion": "2021-02-01",
"name": "[variables('hostingPlanName')]",
"location": "[parameters('location')]",
"sku": {
"tier": "ElasticPremium",
"name": "[parameters('functionAppPlanSku')]",
"family": "EP"
},
"properties": {
"maximumElasticWorkerCount": 20,
"reserved": "[variables('isReserved')]"
},
"kind": "elastic"
},
{
"type": "microsoft.insights/components",
"apiVersion": "2020-02-02",
"name": "[variables('applicationInsightsName')]",
"location": "[parameters('appInsightsLocation')]",
"tags": {
"[concat('hidden-link:', resourceId('Microsoft.Web/sites', variables('applicationInsightsName')))]": "Resource"
},
"properties": {
"Application_Type": "web"
},
"kind": "web"
},
{
"type": "Microsoft.Web/sites",
"apiVersion": "2021-02-01",
"name": "[parameters('functionAppName')]",
"location": "[parameters('location')]",
"kind": "[if(variables('isReserved'), 'functionapp,linux', 'functionapp')]",
"dependsOn": [
"[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
"[resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName'))]",
"[resourceId('Microsoft.Insights/components', variables('applicationInsightsName'))]"
],
"properties": {
"reserved": "[variables('isReserved')]",
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
"siteConfig": {
"linuxFxVersion": "[if(variables('isReserved'), parameters('linuxFxVersion'), json('null'))]",
"appSettings": [
{
"name": "APPINSIGHTS_INSTRUMENTATIONKEY",
"value": "[reference(resourceId('microsoft.insights/components', variables('applicationInsightsName')), '2015-05-01').InstrumentationKey]"
},
{
"name": "AzureWebJobsStorage",
"value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';EndpointSuffix=', environment().suffixes.storage, ';AccountKey=',listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')), '2019-06-01').keys[0].value)]"
},
{
"name": "WEBSITE_CONTENTAZUREFILECONNECTIONSTRING",
"value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';EndpointSuffix=', environment().suffixes.storage, ';AccountKey=',listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')), '2019-06-01').keys[0].value)]"
},
{
"name": "WEBSITE_CONTENTSHARE",
"value": "[toLower(parameters('functionAppName'))]"
},
{
"name": "FUNCTIONS_EXTENSION_VERSION",
"value": "~4"
},
{
"name": "FUNCTIONS_WORKER_RUNTIME",
"value": "[parameters('functionWorkerRuntime')]"
},
{
"name": "WEBSITE_NODE_DEFAULT_VERSION",
"value": "~14"
}
]
}
}
},
{
"type": "Microsoft.Web/sites/slots",
"apiVersion": "2021-02-01",
"name": "[concat(parameters('functionAppName'), '/deployment')]",
"kind": "[if(variables('isReserved'), 'functionapp,linux', 'functionapp')]",
"location": "[parameters('location')]",
"dependsOn": [
"[resourceId('Microsoft.Web/sites', parameters('functionAppName'))]"
],
"properties": {
"reserved": "[variables('isReserved')]",
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('hostingPlanName'))]",
"siteConfig": {
"linuxFxVersion": "[if(variables('isReserved'), parameters('linuxFxVersion'), json('null'))]",
"appSettings": [
{
"name": "APPINSIGHTS_INSTRUMENTATIONKEY",
"value": "[reference(resourceId('microsoft.insights/components', variables('applicationInsightsName')), '2015-05-01').InstrumentationKey]"
},
{
"name": "AzureWebJobsStorage",
"value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';EndpointSuffix=', environment().suffixes.storage, ';AccountKey=',listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')), '2019-06-01').keys[0].value)]"
},
{
"name": "WEBSITE_CONTENTAZUREFILECONNECTIONSTRING",
"value": "[concat('DefaultEndpointsProtocol=https;AccountName=', variables('storageAccountName'), ';EndpointSuffix=', environment().suffixes.storage, ';AccountKey=',listKeys(resourceId('Microsoft.Storage/storageAccounts', variables('storageAccountName')), '2019-06-01').keys[0].value)]"
},
{
"name": "WEBSITE_CONTENTSHARE",
"value": "[variables('slotContentShareName')]"
},
{
"name": "FUNCTIONS_EXTENSION_VERSION",
"value": "~4"
},
{
"name": "FUNCTIONS_WORKER_RUNTIME",
"value": "[parameters('functionWorkerRuntime')]"
},
{
"name": "WEBSITE_NODE_DEFAULT_VERSION",
"value": "~14"
}
]
}
}
}
]
}
Click on the below marked one to create parameter file
Click new as shown in below picture
Use the below code in FileName.parameters.json
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"functionAppName": {
"value": "zapper01"
},
"storageAccountType": {
"value": "Standard_LRS"
},
"location": {
"value": "EastUS"
},
"appInsightsLocation": {
"value": "EastUS"
},
"functionWorkerRuntime": {
"value": "node"
},
"functionPlanOS": {
"value": "Windows"
},
"functionAppPlanSku": {
"value": "EP1"
},
"linuxFxVersion": {
"value": "3.9"
}
}
}
To login to azure portal, run the PowerShell command
az login
Set subscription by using
az account set --subscription "Subscription ID xxxxxx-xxxxxxx-xxxxxxx-xxxxx"
Deploy to azure portal
New-AzResourceGroupDeployment -ResourceGroupName "ResourceGroupName" -TemplateFile "FileName.json" -TemplateParameterFile "Filename.parameters.json"
After execution you will get below one as result in power shall
After deploying into azure portal open the function app and select deployment slot
Update
I have deployed the below code in Custom deployment In Azure portal
Thanks, #seligj95 for the ARM Template code.
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"baseResourceName": {
"type": "string",
"metadata": {
"description": "Name of the resource"
},
"maxLength": 15
},
"appSettingName": {
"type": "string",
"metadata": {
"description": "Name of the app setting"
},
"maxLength": 24
},
"environments": {
"defaultValue": [
"Dev",
"QA",
"UAT",
"Preview"
],
"type": "array",
"metadata": {
"description": "Array with the names for the environment slots"
},
"maxLength": 19
},
"location": {
"type": "string",
"defaultValue": "[resourceGroup().location]",
"metadata": {
"description": "Location for all resources."
}
}
},
"variables": {
"standardPlanMaxAdditionalSlots": 4,
"webAppPortalName": "[concat(parameters('baseResourceName'), 'Portal')]",
"appServicePlanName": "[concat('AppServicePlan-', parameters('baseResourceName'))]",
"stickyAppSettingName": "[concat(parameters('appSettingName'), '-sticky')]"
},
"resources": [
{
"apiVersion": "2020-06-01",
"type": "Microsoft.Web/serverfarms",
"kind": "app",
"name": "[variables('appServicePlanName')]",
"location": "[parameters('location')]",
"comments": "This app service plan is used for the web app and slots.",
"tags": {
"displayName": "AppServicePlan"
},
"properties": { },
"sku": {
"name": "[if(lessOrEquals(length(parameters('environments')), variables('standardPlanMaxAdditionalSlots')), 'S1', 'P1')]"
}
},
{
"apiVersion": "2020-06-01",
"type": "Microsoft.Web/sites",
"kind": "app",
"name": "[variables('webAppPortalName')]",
"location": "[parameters('location')]",
"comments": "This is the web app, also the default 'nameless' slot.",
"tags": {
"displayName": "WebApp"
},
"properties": {
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
"siteConfig": {
"appSettings": [
{
"name": "[parameters('appSettingName')]",
"value": "value"
},
{
"name": "[variables('stickyAppSettingName')]",
"value": "value"
}
]
}
},
"dependsOn": [
"[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
]
},
{
"apiVersion": "2020-06-01",
"type": "Microsoft.Web/sites/slots",
"name": "[concat(variables('webAppPortalName'), '/', parameters('environments')[copyIndex()])]",
"kind": "app",
"location": "[parameters('location')]",
"comments": "This specifies the web app slots.",
"tags": {
"displayName": "WebAppSlots"
},
"properties": {
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
},
"dependsOn": [
"[resourceId('Microsoft.Web/Sites', variables('webAppPortalName'))]"
],
"copy": {
"name": "webPortalSlot",
"count": "[length(parameters('environments'))]"
}
},
{
"apiVersion": "2020-06-01",
"name": "[concat(variables('webAppPortalName'), '/slotconfignames')]",
"type": "Microsoft.Web/sites/config",
"comments": "This specifies the sticky (slot setting) application settings.",
"dependsOn": [
"[resourceId('Microsoft.Web/Sites', variables('webAppPortalName'))]"
],
"properties": {
"appSettingNames": [
"[variables('stickyAppSettingName')]"
]
}
}
]
}
I have selected the second slot as specific sticky slot in arm template, So the second slot is deployed