Microsoft.Web sites/slots

The sites/slots resource type can be deployed to: Resource groups.

To learn about resource group deployments, see Bicep or ARM template.

For a list of changed properties in each API version, see change log.

Template format

To create a Microsoft.Web/sites/slots resource, add the following Bicep or JSON to your template.

resource symbolicname 'Microsoft.Web/sites/slots@2021-03-01' = {
  name: 'string'
  location: 'string'
  tags: {
    tagName1: 'tagValue1'
    tagName2: 'tagValue2'
  kind: 'string'
  parent: resourceSymbolicName
  extendedLocation: {
    name: 'string'
  identity: {
    type: 'string'
    userAssignedIdentities: {}
  properties: {
    clientAffinityEnabled: bool
    clientCertEnabled: bool
    clientCertExclusionPaths: 'string'
    clientCertMode: 'string'
    cloningInfo: {
      appSettingsOverrides: {}
      cloneCustomHostNames: bool
      cloneSourceControl: bool
      configureLoadBalancing: bool
      correlationId: 'string'
      hostingEnvironment: 'string'
      overwrite: bool
      sourceWebAppId: 'string'
      sourceWebAppLocation: 'string'
      trafficManagerProfileId: 'string'
      trafficManagerProfileName: 'string'
    containerSize: int
    customDomainVerificationId: 'string'
    dailyMemoryTimeQuota: int
    enabled: bool
    hostingEnvironmentProfile: {
      id: 'string'
    hostNamesDisabled: bool
    hostNameSslStates: [
        hostType: 'string'
        name: 'string'
        sslState: 'string'
        thumbprint: 'string'
        toUpdate: bool
        virtualIP: 'string'
    httpsOnly: bool
    hyperV: bool
    isXenon: bool
    keyVaultReferenceIdentity: 'string'
    redundancyMode: 'string'
    reserved: bool
    scmSiteAlsoStopped: bool
    serverFarmId: 'string'
    siteConfig: {
      acrUseManagedIdentityCreds: bool
      acrUserManagedIdentityID: 'string'
      alwaysOn: bool
      apiDefinition: {
        url: 'string'
      apiManagementConfig: {
        id: 'string'
      appCommandLine: 'string'
      appSettings: [
          name: 'string'
          value: 'string'
      autoHealEnabled: bool
      autoHealRules: {
        actions: {
          actionType: 'string'
          customAction: {
            exe: 'string'
            parameters: 'string'
          minProcessExecutionTime: 'string'
        triggers: {
          privateBytesInKB: int
          requests: {
            count: int
            timeInterval: 'string'
          slowRequests: {
            count: int
            path: 'string'
            timeInterval: 'string'
            timeTaken: 'string'
          slowRequestsWithPath: [
              count: int
              path: 'string'
              timeInterval: 'string'
              timeTaken: 'string'
          statusCodes: [
              count: int
              path: 'string'
              status: int
              subStatus: int
              timeInterval: 'string'
              win32Status: int
          statusCodesRange: [
              count: int
              path: 'string'
              statusCodes: 'string'
              timeInterval: 'string'
      autoSwapSlotName: 'string'
      azureStorageAccounts: {}
      connectionStrings: [
          connectionString: 'string'
          name: 'string'
          type: 'string'
      cors: {
        allowedOrigins: [
        supportCredentials: bool
      defaultDocuments: [
      detailedErrorLoggingEnabled: bool
      documentRoot: 'string'
      experiments: {
        rampUpRules: [
            actionHostName: 'string'
            changeDecisionCallbackUrl: 'string'
            changeIntervalInMinutes: int
            changeStep: int
            maxReroutePercentage: int
            minReroutePercentage: int
            name: 'string'
            reroutePercentage: int
      ftpsState: 'string'
      functionAppScaleLimit: int
      functionsRuntimeScaleMonitoringEnabled: bool
      handlerMappings: [
          arguments: 'string'
          extension: 'string'
          scriptProcessor: 'string'
      healthCheckPath: 'string'
      http20Enabled: bool
      httpLoggingEnabled: bool
      ipSecurityRestrictions: [
          action: 'string'
          description: 'string'
          headers: {}
          ipAddress: 'string'
          name: 'string'
          priority: int
          subnetMask: 'string'
          subnetTrafficTag: int
          tag: 'string'
          vnetSubnetResourceId: 'string'
          vnetTrafficTag: int
      javaContainer: 'string'
      javaContainerVersion: 'string'
      javaVersion: 'string'
      keyVaultReferenceIdentity: 'string'
      limits: {
        maxDiskSizeInMb: int
        maxMemoryInMb: int
        maxPercentageCpu: int
      linuxFxVersion: 'string'
      loadBalancing: 'string'
      localMySqlEnabled: bool
      logsDirectorySizeLimit: int
      managedPipelineMode: 'string'
      managedServiceIdentityId: int
      minimumElasticInstanceCount: int
      minTlsVersion: 'string'
      netFrameworkVersion: 'string'
      nodeVersion: 'string'
      numberOfWorkers: int
      phpVersion: 'string'
      powerShellVersion: 'string'
      preWarmedInstanceCount: int
      publicNetworkAccess: 'string'
      publishingUsername: 'string'
      push: {
        kind: 'string'
        properties: {
          dynamicTagsJson: 'string'
          isPushEnabled: bool
          tagsRequiringAuth: 'string'
          tagWhitelistJson: 'string'
      pythonVersion: 'string'
      remoteDebuggingEnabled: bool
      remoteDebuggingVersion: 'string'
      requestTracingEnabled: bool
      requestTracingExpirationTime: 'string'
      scmIpSecurityRestrictions: [
          action: 'string'
          description: 'string'
          headers: {}
          ipAddress: 'string'
          name: 'string'
          priority: int
          subnetMask: 'string'
          subnetTrafficTag: int
          tag: 'string'
          vnetSubnetResourceId: 'string'
          vnetTrafficTag: int
      scmIpSecurityRestrictionsUseMain: bool
      scmMinTlsVersion: 'string'
      scmType: 'string'
      tracingOptions: 'string'
      use32BitWorkerProcess: bool
      virtualApplications: [
          physicalPath: 'string'
          preloadEnabled: bool
          virtualDirectories: [
              physicalPath: 'string'
              virtualPath: 'string'
          virtualPath: 'string'
      vnetName: 'string'
      vnetPrivatePortsCount: int
      vnetRouteAllEnabled: bool
      websiteTimeZone: 'string'
      webSocketsEnabled: bool
      windowsFxVersion: 'string'
      xManagedServiceIdentityId: int
    storageAccountRequired: bool
    virtualNetworkSubnetId: 'string'

Property values


Name Description Value
type The resource type

For Bicep, set this value in the resource declaration.
apiVersion The resource api version

For Bicep, set this value in the resource declaration.
name The resource name

See how to set names and types for child resources in Bicep or JSON ARM templates.
string (required)

Character limit: 2-59

Valid characters:
Alphanumeric, hyphens and Unicode characters that can be mapped to Punycode
location Resource Location. string (required)
tags Resource tags. Dictionary of tag names and values. See Tags in templates
kind Kind of resource. string
parent In Bicep, you can specify the parent resource for a child resource. You only need to add this property when the child resource is declared outside of the parent resource.

For more information, see Child resource outside parent resource.
Symbolic name for resource of type: sites
extendedLocation Extended Location. ExtendedLocation
identity Managed service identity. ManagedServiceIdentity
properties Site resource specific properties SiteProperties


Name Description Value
name Name of extended location. string


Name Description Value
type Type of managed service identity. 'None'
'SystemAssigned, UserAssigned'
userAssignedIdentities The list of user assigned identities associated with the resource. The user identity dictionary key references will be ARM resource ids in the form: '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ManagedIdentity/userAssignedIdentities/{identityName} object


Name Description Value
clientAffinityEnabled true to enable client affinity; false to stop sending session affinity cookies, which route client requests in the same session to the same instance. Default is true. bool
clientCertEnabled true to enable client certificate authentication (TLS mutual authentication); otherwise, false. Default is false. bool
clientCertExclusionPaths client certificate authentication comma-separated exclusion paths string
clientCertMode This composes with ClientCertEnabled setting.
- ClientCertEnabled: false means ClientCert is ignored.
- ClientCertEnabled: true and ClientCertMode: Required means ClientCert is required.
- ClientCertEnabled: true and ClientCertMode: Optional means ClientCert is optional or accepted.
cloningInfo If specified during app creation, the app is cloned from a source app. CloningInfo
containerSize Size of the function container. int
customDomainVerificationId Unique identifier that verifies the custom domains assigned to the app. Customer will add this id to a txt record for verification. string
dailyMemoryTimeQuota Maximum allowed daily memory-time quota (applicable on dynamic apps only). int
enabled true if the app is enabled; otherwise, false. Setting this value to false disables the app (takes the app offline). bool
hostingEnvironmentProfile App Service Environment to use for the app. HostingEnvironmentProfile
hostNamesDisabled true to disable the public hostnames of the app; otherwise, false.
If true, the app is only accessible via API management process.
hostNameSslStates Hostname SSL states are used to manage the SSL bindings for app's hostnames. HostNameSslState[]
httpsOnly HttpsOnly: configures a web site to accept only https requests. Issues redirect for
http requests
hyperV Hyper-V sandbox. bool
isXenon Obsolete: Hyper-V sandbox. bool
keyVaultReferenceIdentity Identity to use for Key Vault Reference authentication. string
redundancyMode Site redundancy mode 'ActiveActive'
reserved true if reserved; otherwise, false. bool
scmSiteAlsoStopped true to stop SCM (KUDU) site when the app is stopped; otherwise, false. The default is false. bool
serverFarmId Resource ID of the associated App Service plan, formatted as: "/subscriptions/{subscriptionID}/resourceGroups/{groupName}/providers/Microsoft.Web/serverfarms/{appServicePlanName}". string
siteConfig Configuration of the app. SiteConfig
storageAccountRequired Checks if Customer provided storage account is required bool
virtualNetworkSubnetId Azure Resource Manager ID of the Virtual network and subnet to be joined by Regional VNET Integration.
This must be of the form /subscriptions/{subscriptionName}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/virtualNetworks/{vnetName}/subnets/{subnetName}


Name Description Value
appSettingsOverrides Application setting overrides for cloned app. If specified, these settings override the settings cloned
from source app. Otherwise, application settings from source app are retained.
cloneCustomHostNames true to clone custom hostnames from source app; otherwise, false. bool
cloneSourceControl true to clone source control from source app; otherwise, false. bool
configureLoadBalancing true to configure load balancing for source and destination app. bool
correlationId Correlation ID of cloning operation. This ID ties multiple cloning operations
together to use the same snapshot.
hostingEnvironment App Service Environment. string
overwrite true to overwrite destination app; otherwise, false. bool
sourceWebAppId ARM resource ID of the source app. App resource ID is of the form
/subscriptions/{subId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{siteName} for production slots and
/subscriptions/{subId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/sites/{siteName}/slots/{slotName} for other slots.
string (required)
sourceWebAppLocation Location of source app ex: West US or North Europe string
trafficManagerProfileId ARM resource ID of the Traffic Manager profile to use, if it exists. Traffic Manager resource ID is of the form
trafficManagerProfileName Name of Traffic Manager profile to create. This is only needed if Traffic Manager profile does not already exist. string


Name Description Value
id Resource ID of the App Service Environment. string


Name Description Value
hostType Indicates whether the hostname is a standard or repository hostname. 'Repository'
name Hostname. string
sslState SSL type. 'Disabled'
thumbprint SSL certificate thumbprint. string
toUpdate Set to true to update existing hostname. bool
virtualIP Virtual IP address assigned to the hostname if IP based SSL is enabled. string


Name Description Value
acrUseManagedIdentityCreds Flag to use Managed Identity Creds for ACR pull bool
acrUserManagedIdentityID If using user managed identity, the user managed identity ClientId string
alwaysOn true if Always On is enabled; otherwise, false. bool
apiDefinition Information about the formal API definition for the app. ApiDefinitionInfo
apiManagementConfig Azure API management settings linked to the app. ApiManagementConfig
appCommandLine App command line to launch. string
appSettings Application settings. NameValuePair[]
autoHealEnabled true if Auto Heal is enabled; otherwise, false. bool
autoHealRules Auto Heal rules. AutoHealRules
autoSwapSlotName Auto-swap slot name. string
azureStorageAccounts List of Azure Storage Accounts. object
connectionStrings Connection strings. ConnStringInfo[]
cors Cross-Origin Resource Sharing (CORS) settings. CorsSettings
defaultDocuments Default documents. string[]
detailedErrorLoggingEnabled true if detailed error logging is enabled; otherwise, false. bool
documentRoot Document root. string
experiments This is work around for polymorphic types. Experiments
ftpsState State of FTP / FTPS service 'AllAllowed'
functionAppScaleLimit Maximum number of workers that a site can scale out to.
This setting only applies to the Consumption and Elastic Premium Plans
functionsRuntimeScaleMonitoringEnabled Gets or sets a value indicating whether functions runtime scale monitoring is enabled. When enabled,
the ScaleController will not monitor event sources directly, but will instead call to the
runtime to get scale status.
handlerMappings Handler mappings. HandlerMapping[]
healthCheckPath Health check path string
http20Enabled Http20Enabled: configures a web site to allow clients to connect over http2.0 bool
httpLoggingEnabled true if HTTP logging is enabled; otherwise, false. bool
ipSecurityRestrictions IP security restrictions for main. IpSecurityRestriction[]
javaContainer Java container. string
javaContainerVersion Java container version. string
javaVersion Java version. string
keyVaultReferenceIdentity Identity to use for Key Vault Reference authentication. string
limits Site limits. SiteLimits
linuxFxVersion Linux App Framework and version string
loadBalancing Site load balancing. 'LeastRequests'
localMySqlEnabled true to enable local MySQL; otherwise, false. bool
logsDirectorySizeLimit HTTP logs directory size limit. int
managedPipelineMode Managed pipeline mode. 'Classic'
managedServiceIdentityId Managed Service Identity Id int
minimumElasticInstanceCount Number of minimum instance count for a site
This setting only applies to the Elastic Plans
minTlsVersion MinTlsVersion: configures the minimum version of TLS required for SSL requests '1.0'
netFrameworkVersion .NET Framework version. string
nodeVersion Version of Node.js. string
numberOfWorkers Number of workers. int
phpVersion Version of PHP. string
powerShellVersion Version of PowerShell. string
preWarmedInstanceCount Number of preWarmed instances.
This setting only applies to the Consumption and Elastic Plans
publicNetworkAccess Property to allow or block all public traffic. string
publishingUsername Publishing user name. string
push Push endpoint settings. PushSettings
pythonVersion Version of Python. string
remoteDebuggingEnabled true if remote debugging is enabled; otherwise, false. bool
remoteDebuggingVersion Remote debugging version. string
requestTracingEnabled true if request tracing is enabled; otherwise, false. bool
requestTracingExpirationTime Request tracing expiration time. string
scmIpSecurityRestrictions IP security restrictions for scm. IpSecurityRestriction[]
scmIpSecurityRestrictionsUseMain IP security restrictions for scm to use main. bool
scmMinTlsVersion ScmMinTlsVersion: configures the minimum version of TLS required for SSL requests for SCM site '1.0'
scmType SCM type. 'BitbucketGit'
tracingOptions Tracing options. string
use32BitWorkerProcess true to use 32-bit worker process; otherwise, false. bool
virtualApplications Virtual applications. VirtualApplication[]
vnetName Virtual Network name. string
vnetPrivatePortsCount The number of private ports assigned to this app. These will be assigned dynamically on runtime. int
vnetRouteAllEnabled Virtual Network Route All enabled. This causes all outbound traffic to have Virtual Network Security Groups and User Defined Routes applied. bool
websiteTimeZone Sets the time zone a site uses for generating timestamps. Compatible with Linux and Windows App Service. Setting the WEBSITE_TIME_ZONE app setting takes precedence over this config. For Linux, expects tz database values (for a quick reference see For Windows, expects one of the time zones listed under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones string
webSocketsEnabled true if WebSocket is enabled; otherwise, false. bool
windowsFxVersion Xenon App Framework and version string
xManagedServiceIdentityId Explicit Managed Service Identity Id int


Name Description Value
url The URL of the API definition. string


Name Description Value
id APIM-Api Identifier. string


Name Description Value
name Pair name. string
value Pair value. string


Name Description Value
actions Actions to be executed when a rule is triggered. AutoHealActions
triggers Conditions that describe when to execute the auto-heal actions. AutoHealTriggers


Name Description Value
actionType Predefined action to be taken. 'CustomAction'
customAction Custom action to be taken. AutoHealCustomAction
minProcessExecutionTime Minimum time the process must execute
before taking the action


Name Description Value
exe Executable to be run. string
parameters Parameters for the executable. string


Name Description Value
privateBytesInKB A rule based on private bytes. int
requests A rule based on total requests. RequestsBasedTrigger
slowRequests A rule based on request execution time. SlowRequestsBasedTrigger
slowRequestsWithPath A rule based on multiple Slow Requests Rule with path SlowRequestsBasedTrigger[]
statusCodes A rule based on status codes. StatusCodesBasedTrigger[]
statusCodesRange A rule based on status codes ranges. StatusCodesRangeBasedTrigger[]


Name Description Value
count Request Count. int
timeInterval Time interval. string


Name Description Value
count Request Count. int
path Request Path. string
timeInterval Time interval. string
timeTaken Time taken. string


Name Description Value
count Request Count. int
path Request Path string
status HTTP status code. int
subStatus Request Sub Status. int
timeInterval Time interval. string
win32Status Win32 error code. int


Name Description Value
count Request Count. int
path string
statusCodes HTTP status code. string
timeInterval Time interval. string


Name Description Value
connectionString Connection string value. string
name Name of connection string. string
type Type of database. 'ApiHub'


Name Description Value
allowedOrigins Gets or sets the list of origins that should be allowed to make cross-origin
calls (for example: Use "*" to allow all.
supportCredentials Gets or sets whether CORS requests with credentials are allowed. See
for more details.


Name Description Value
rampUpRules List of ramp-up rules. RampUpRule[]


Name Description Value
actionHostName Hostname of a slot to which the traffic will be redirected if decided to. E.g. string
changeDecisionCallbackUrl Custom decision algorithm can be provided in TiPCallback site extension which URL can be specified. See TiPCallback site extension for the scaffold and contracts.
changeIntervalInMinutes Specifies interval in minutes to reevaluate ReroutePercentage. int
changeStep In auto ramp up scenario this is the step to add/remove from ReroutePercentage until it reaches \nMinReroutePercentage or
MaxReroutePercentage. Site metrics are checked every N minutes specified in ChangeIntervalInMinutes.\nCustom decision algorithm
can be provided in TiPCallback site extension which URL can be specified in ChangeDecisionCallbackUrl.
maxReroutePercentage Specifies upper boundary below which ReroutePercentage will stay. int
minReroutePercentage Specifies lower boundary above which ReroutePercentage will stay. int
name Name of the routing rule. The recommended name would be to point to the slot which will receive the traffic in the experiment. string
reroutePercentage Percentage of the traffic which will be redirected to ActionHostName. int


Name Description Value
arguments Command-line arguments to be passed to the script processor. string
extension Requests with this extension will be handled using the specified FastCGI application. string
scriptProcessor The absolute path to the FastCGI application. string


Name Description Value
action Allow or Deny access for this IP range. string
description IP restriction rule description. string
headers IP restriction rule headers.
X-Forwarded-Host (
The matching logic is ..
- If the property is null or empty (default), all hosts(or lack of) are allowed.
- A value is compared using ordinal-ignore-case (excluding port number).
- Subdomain wildcards are permitted but don't match the root domain. For example, * matches the subdomain
but not the root domain or multi-level
- Unicode host names are allowed but are converted to Punycode for matching.

X-Forwarded-For (
The matching logic is ..
- If the property is null or empty (default), any forwarded-for chains (or lack of) are allowed.
- If any address (excluding port number) in the chain (comma separated) matches the CIDR defined by the property.

X-Azure-FDID and X-FD-HealthProbe.
The matching logic is exact match.
ipAddress IP address the security restriction is valid for.
It can be in form of pure ipv4 address (required SubnetMask property) or
CIDR notation such as ipv4/mask (leading bit match). For CIDR,
SubnetMask property must not be specified.
name IP restriction rule name. string
priority Priority of IP restriction rule. int
subnetMask Subnet mask for the range of IP addresses the restriction is valid for. string
subnetTrafficTag (internal) Subnet traffic tag int
tag Defines what this IP filter will be used for. This is to support IP filtering on proxies. 'Default'
vnetSubnetResourceId Virtual network resource id string
vnetTrafficTag (internal) Vnet traffic tag int


Name Description Value
maxDiskSizeInMb Maximum allowed disk size usage in MB. int
maxMemoryInMb Maximum allowed memory usage in MB. int
maxPercentageCpu Maximum allowed CPU usage percentage. int


Name Description Value
kind Kind of resource. string
properties PushSettings resource specific properties PushSettingsProperties


Name Description Value
dynamicTagsJson Gets or sets a JSON string containing a list of dynamic tags that will be evaluated from user claims in the push registration endpoint. string
isPushEnabled Gets or sets a flag indicating whether the Push endpoint is enabled. bool (required)
tagsRequiringAuth Gets or sets a JSON string containing a list of tags that require user authentication to be used in the push registration endpoint.
Tags can consist of alphanumeric characters and the following:
'_', '@', '#', '.', ':', '-'.
Validation should be performed at the PushRequestHandler.
tagWhitelistJson Gets or sets a JSON string containing a list of tags that are allowed for use by the push registration endpoint. string


Name Description Value
physicalPath Physical path. string
preloadEnabled true if preloading is enabled; otherwise, false. bool
virtualDirectories Virtual directories for virtual application. VirtualDirectory[]
virtualPath Virtual path. string


Name Description Value
physicalPath Physical path. string
virtualPath Path to virtual application. string

Quickstart templates

The following quickstart templates deploy this resource type.

Template Description
Provision Consumption plan function with a Deployment Slot

Deploy to Azure
This template provisions a function app on a Consumption plan, which is a dynamic hosting plan. The app runs on demand and you're billed per execution, with no standing resource committment. There are other templates available for provisioning on a dedicated hosting plan.
Web App with custom Deployment slots

Deploy to Azure
This template provides an easy way to deploy a web app with custom deployment slots on Azure Web Apps.