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With the recent release of Vue 2.6, the syntax for using slots has been made more succinct. This change to slots has gotten me re-interested in discovering the potential power of slots to provide reusability, new features, and clearer readability to our Vue-based projects. What are slots truly capable of?

If you’re new to Vue or haven’t seen the changes from version 2.6, read on. Probably the best resource for learning about slots is Vue’s own documentation, but I’ll try to give a rundown here.

What Are Slots?

Slots are a mechanism for Vue components that allows you to compose your components in a way other than the strict parent-child relationship. Slots give you an outlet to place content in new places or make components more generic. The best way to understand them is to see them in action. Let’s start with a simple example:

This component has a wrapper div. Let’s pretend that div is there to create a stylistic frame around its content. This component is able to be used generically to wrap a frame around any content you want. Let’s see what it looks like to use it. The frame component here refers to the component we just made above.

The content that is between the opening and closing frame tags will get inserted into the frame component where the slot is, replacing the slot tags. This is the most basic way of doing it. You can also specify default content to go into a slot simply by filling it in:

So now if we use it like this instead:

The default text of “This is the default content if nothing gets specified to go here” will show up, but if we use it as we did before, the default text will be overridden by the img tag.

Multiple/Named Slots

You can add multiple slots to a component, but if you do, all but one of them is required to have a name. If there is one without a name, it is the default slot. Here’s how you create multiple slots:

We kept the same default slot, but this time we added a slot named header where you can enter a title. You use it like this:

Just like before, if we want to add content to the default slot, just put it directly inside the titled-frame component. To add content to a named slot, though, we needed to wrap the code in a template tag with a v-slot directive. You add a colon (:) after v-slot and then write the name of the slot you want the content to be passed to. Note that v-slot is new to Vue 2.6, so if you’re using an older version, you’ll need to read the docs about the deprecated slot syntax.

Scoped Slots

One more thing you’ll need to know is that slots can pass data/functions down to their children. To demonstrate this, we’ll need a completely different example component with slots, one that’s even more contrived than the previous one: let’s sorta copy the example from the docs by creating a component that supplies the data about the current user to its slots:

This component has a property called user with details about the user. By default, the component shows the user’s last name, but note that it is using v-bind to bind the user data to the slot. With that, we can use this component to provide the user data to its descendant:

To get access to the data passed to the slot, we specify the name of the scope variable with the value of the v-slot directive.

There are a few notes to take here:

• We specified the name of default, though we don’t need to for the default slot. Instead we could just use v-slot='slotProps'.
• You don’t need to use slotProps as the name. You can call it whatever you want.
• If you’re only using a default slot, you can skip that inner template tag and put the v-slot directive directly onto the current-user tag.
• You can use object destructuring to create direct references to the scoped slot data rather than using a single variable name. In other words, you can use v-slot='{user}' instead of v-slot='slotProps' and then you can use user directly instead of slotProps.user.

Taking those notes into account, the above example can be rewritten like this:

A couple more things to keep in mind:

• You can bind more than one value with v-bind directives. So in the example, I could have done more than just user.
• You can pass functions to scoped slots too. Many libraries use this to provide reusable functional components as you’ll see later.
• v-slot has an alias of #. So instead of writing v-slot:header='data', you can write #header='data'. You can also just specify #header instead of v-slot:header when you’re not using scoped slots. As for default slots, you’ll need to specify the name of default when you use the alias. In other words, you’ll need to write #default='data' instead of #='data'.

There are a few more minor points you can learn about from the docs, but that should be enough to help you understand what we’re talking about in the rest of this article.

What Can You Do With Slots?

Slots weren’t built for a single purpose, or at least if they were, they’ve evolved way beyond that original intention to be a powerhouse tool for doing many different things.

Reusable Patterns

Components were always designed to be able to be reused, but some patterns aren’t practical to enforce with a single “normal” component because the number of props you’ll need in order to customize it can be excessive or you’d need to pass large sections of content and potentially other components through the props. Slots can be used to encompass the “outside” part of the pattern and allow other HTML and/or components to placed inside of them to customize the “inside” part, allowing the component with slots to define the pattern and the components injected into the slots to be unique.

For our first example, let’s start with something simple: a button. Imagine you and your team are using Bootstrap*. With Bootstrap, your buttons are often strapped with the base `btn` class and a class specifying the color, such as `btn-primary`. You can also add a size class, such as `btn-lg`.

* I neither encourage nor discourage you from doing this, I just needed something for my example and it’s pretty well known.

Let’s now assume, for simplicity’s sake that your app/site always uses btn-primary and btn-lg. You don’t want to always have to write all three classes on your buttons, or maybe you don’t trust a rookie to remember to do all three. In that case, you can create a component that automatically has all three of those classes, but how do you allow customization of the content? A prop isn’t practical because a button tag is allowed to have all kinds of HTML in it, so we should use a slot.

Now we can use it everywhere with whatever content you want:

Of course, you can go with something much bigger than a button. Sticking with Bootstrap, let’s look at a modal, or least the HTML part; I won’t be going into functionality… yet.

Now, let’s use this:

The above type of use case for slots is obviously very useful, but it can do even more.

Reusing Functionality

Vue components aren’t all about the HTML and CSS. They’re built with JavaScript, so they’re also about functionality. Slots can be useful for creating functionality once and using it in multiple places. Let’s go back to our modal example and add a function that closes the modal:

Now when you use this component, you can add a button to the footer that can close the modal. Normally, in the case of a Bootstrap modal, you could just add data-dismiss='modal' to a button, but we want to hide Bootstrap specific things away from the components that will be slotting into this modal component. So we pass them a function they can call and they are none the wiser about Bootstrap’s involvement:

Renderless Components

And finally, you can take what you know about using slots to pass around reusable functionality and strip practically all of the HTML and just use the slots. That’s essentially what a renderless component is: a component that provides only functionality without any HTML.

Making components truly renderless can be a little tricky because you’ll need to write render functions rather than using a template in order to remove the need for a root element, but it may not always be necessary. Let’s take a look at a simple example that does let us use a template first, though:

This is an odd example of a renderless component because it doesn’t even have any JavaScript in it. That’s mostly because we’re just creating a pre-configured reusable version of a built-in renderless function: transition.

Yup, Vue has built-in renderless components. This particular example is taken from an article on reusable transitions by Cristi Jora and shows a simple way to create a renderless component that can standardize the transitions used throughout your application. Cristi’s article goes into a lot more depth and shows some more advanced variations of reusable transitions, so I recommend checking it out.

For our other example, we’ll create a component that handles switching what is shown during the different states of a Promise: pending, successfully resolved, and failed. It’s a common pattern and while it doesn’t require a lot of code, it can muddy up a lot of your components if the logic isn’t pulled out for reusability.

So what is going on here? First, note that we are receiving a prop called promise that is a Promise. In the watch section we watch for changes to the promise and when it changes (or immediately on component creation thanks to the immediate property) we clear the state, and call then and catch on the promise, updating the state when it either finishes successfully or fails.

Then, in the template, we show a different slot based on the state. Note that we failed to keep it truly renderless because we needed a root element in order to use a template. We’re passing data and error to the relevant slot scopes as well.

And here’s an example of it being used:

We pass in somePromise to the renderless component. While we’re waiting for it to finish, we’re displaying “Working on it…” thanks to the pending slot. If it succeeds we display “Resolved:” and the resolution value. If it fails we display “Rejected:” and the error that caused the rejection. Now we no longer need to track the state of the promise within this component because that part is pulled out into its own reusable component.

So, what can we do about that span wrapping around the slots in promised.vue? To remove it, we’ll need to remove the template portion and add a render function to our component:

There isn’t anything too tricky going on here. We’re just using some if blocks to find the state and then returning the correct scoped slot (via this.$scopedSlots['SLOTNAME'](...)) and passing the relevant data to the slot scope. When you’re not using a template, you can skip using the .vue file extension by pulling the JavaScript out of the script tag and just plunking it into a .js file. This should give you a very slight performance bump when compiling those Vue files.

This example is a stripped-down and slightly tweaked version of vue-promised, which I would recommend over using the above example because they cover over some potential pitfalls. There are plenty of other great examples of renderless components out there too. Baleada is an entire library full of renderless components that provide useful functionality like this. There’s also vue-virtual-scroller for controlling the rendering of list item based on what is visible on the screen or PortalVue for “teleporting” content to completely different parts of the DOM.

I’m Out

Vue’s slots take component-based development to a whole new level, and while I’ve demonstrated a lot of great ways slots can be used, there are countless more out there. What great idea can you think of? What ways do you think slots could get an upgrade? If you have any, make sure to bring your ideas to the Vue team. God bless and happy coding.

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When you deploy your web app, web app on Linux, mobile back end, or API app to Azure App Service, you can use a separate deployment slot instead of the default production slot when you're running in the Standard, Premium, or Isolated App Service plan tier. Deployment slots are live apps with their own host names. App content and configurations elements can be swapped between two deployment slots, including the production slot.

Deploying your application to a non-production slot has the following benefits:

• You can validate app changes in a staging deployment slot before swapping it with the production slot.
• Deploying an app to a slot first and swapping it into production makes sure that all instances of the slot are warmed up before being swapped into production. This eliminates downtime when you deploy your app. The traffic redirection is seamless, and no requests are dropped because of swap operations. You can automate this entire workflow by configuring auto swap when pre-swap validation isn't needed.
• After a swap, the slot with previously staged app now has the previous production app. If the changes swapped into the production slot aren't as you expect, you can perform the same swap immediately to get your 'last known good site' back.

Each App Service plan tier supports a different number of deployment slots. There's no additional charge for using deployment slots. To find out the number of slots your app's tier supports, see App Service limits.

To scale your app to a different tier, make sure that the target tier supports the number of slots your app already uses. For example, if your app has more than five slots, you can't scale it down to the Standard tier, because the Standard tier supports only five deployment slots.

Add a slot

The app must be running in the Standard, Premium, or Isolated tier in order for you to enable multiple deployment slots.

1. in the Azure portal, search for and select App Services and select your app.

2. In the left pane, select Deployment slots > Add Slot.

   Note

   If the app isn't already in the Standard, Premium, or Isolated tier, you receive a message that indicates the supported tiers for enabling staged publishing. At this point, you have the option to select Upgrade and go to the Scale tab of your app before continuing.

3. In the Add a slot dialog box, give the slot a name, and select whether to clone an app configuration from another deployment slot. Select Add to continue.

   You can clone a configuration from any existing slot. Settings that can be cloned include app settings, connection strings, language framework versions, web sockets, HTTP version, and platform bitness.

4. After the slot is added, select Close to close the dialog box. The new slot is now shown on the Deployment slots page. By default, Traffic % is set to 0 for the new slot, with all customer traffic routed to the production slot.

5. Select the new deployment slot to open that slot's resource page.

   The staging slot has a management page just like any other App Service app. You can change the slot's configuration. To remind you that you're viewing the deployment slot, the app name is shown as <app-name>/<slot-name>, and the app type is App Service (Slot). You can also see the slot as a separate app in your resource group, with the same designations.

6. Select the app URL on the slot's resource page. The deployment slot has its own host name and is also a live app. To limit public access to the deployment slot, see Azure App Service IP restrictions.

The new deployment slot has no content, even if you clone the settings from a different slot. For example, you can publish to this slot with Git. You can deploy to the slot from a different repository branch or a different repository.

What happens during a swap

Swap operation steps

When you swap two slots (usually from a staging slot into the production slot), App Service does the following to ensure that the target slot doesn't experience downtime:

1. Apply the following settings from the target slot (for example, the production slot) to all instances of the source slot:

   • Slot-specific app settings and connection strings, if applicable.
   • Continuous deployment settings, if enabled.
   • App Service authentication settings, if enabled.

   Any of these cases trigger all instances in the source slot to restart. During swap with preview, this marks the end of the first phase. The swap operation is paused, and you can validate that the source slot works correctly with the target slot's settings.

2. Wait for every instance in the source slot to complete its restart. If any instance fails to restart, the swap operation reverts all changes to the source slot and stops the operation.

3. If local cache is enabled, trigger local cache initialization by making an HTTP request to the application root ('/') on each instance of the source slot. Wait until each instance returns any HTTP response. Local cache initialization causes another restart on each instance.

4. If auto swap is enabled with custom warm-up, trigger Application Initiation by making an HTTP request to the application root ('/') on each instance of the source slot.

   If applicationInitialization isn't specified, trigger an HTTP request to the application root of the source slot on each instance.

   If an instance returns any HTTP response, it's considered to be warmed up.

5. If all instances on the source slot are warmed up successfully, swap the two slots by switching the routing rules for the two slots. After this step, the target slot (for example, the production slot) has the app that's previously warmed up in the source slot.

6. Now that the source slot has the pre-swap app previously in the target slot, perform the same operation by applying all settings and restarting the instances.

At any point of the swap operation, all work of initializing the swapped apps happens on the source slot. The target slot remains online while the source slot is being prepared and warmed up, regardless of where the swap succeeds or fails. To swap a staging slot with the production slot, make sure that the production slot is always the target slot. This way, the swap operation doesn't affect your production app.

Which settings are swapped?

When you clone configuration from another deployment slot, the cloned configuration is editable. Some configuration elements follow the content across a swap (not slot specific), whereas other configuration elements stay in the same slot after a swap (slot specific). The following lists show the settings that change when you swap slots.

Settings that are swapped:

• General settings, such as framework version, 32/64-bit, web sockets
• App settings (can be configured to stick to a slot)
• Connection strings (can be configured to stick to a slot)
• Handler mappings
• Public certificates
• WebJobs content
• Hybrid connections *
• Service endpoints *
• Azure Content Delivery Network *

Features marked with an asterisk (*) are planned to be unswapped.

Settings that aren't swapped:

• Publishing endpoints
• Custom domain names
• Non-public certificates and TLS/SSL settings
• Scale settings
• WebJobs schedulers
• IP restrictions
• Always On
• Diagnostic settings
• Cross-origin resource sharing (CORS)
• Virtual network integration

Note

To make these settings swappable, add the app setting WEBSITE_OVERRIDE_PRESERVE_DEFAULT_STICKY_SLOT_SETTINGS in every slot of the app and set its value to 0 or false. These settings are either all swappable or not at all. You can’t make just some settings swappable and not the others.

Certain app settings that apply to unswapped settings are also not swapped. For example, since diagnostic settings are not swapped, related app settings like WEBSITE_HTTPLOGGING_RETENTION_DAYS and DIAGNOSTICS_AZUREBLOBRETENTIONDAYS are also not swapped, even if they don't show up as slot settings.

To configure an app setting or connection string to stick to a specific slot (not swapped), go to the Configuration page for that slot. Add or edit a setting, and then select deployment slot setting. Selecting this check box tells App Service that the setting is not swappable.

Swap two slots

You can swap deployment slots on your app's Deployment slots page and the Overview page. For technical details on the slot swap, see What happens during swap.

Important

Before you swap an app from a deployment slot into production, make sure that production is your target slot and that all settings in the source slot are configured exactly as you want to have them in production.

To swap deployment slots:

1. Go to your app's Deployment slots page and select Swap.

   The Swap dialog box shows settings in the selected source and target slots that will be changed.

2. Select the desired Source and Target slots. Usually, the target is the production slot. Also, select the Source Changes and Target Changes tabs and verify that the configuration changes are expected. When you're finished, you can swap the slots immediately by selecting Swap.

   To see how your target slot would run with the new settings before the swap actually happens, don't select Swap, but follow the instructions in Swap with preview.

3. When you're finished, close the dialog box by selecting Close.

If you have any problems, see Troubleshoot swaps.

Swap with preview (multi-phase swap)

Before you swap into production as the target slot, validate that the app runs with the swapped settings. The source slot is also warmed up before the swap completion, which is desirable for mission-critical applications.

When you perform a swap with preview, App Service performs the same swap operation but pauses after the first step. You can then verify the result on the staging slot before completing the swap.

If you cancel the swap, App Service reapplies configuration elements to the source slot.

To swap with preview:

1. Follow the steps in Swap deployment slots but select Perform swap with preview.

   The dialog box shows you how the configuration in the source slot changes in phase 1, and how the source and target slot change in phase 2.

2. When you're ready to start the swap, select Start Swap.

   When phase 1 finishes, you're notified in the dialog box. Preview the swap in the source slot by going to https://<app_name>-<source-slot-name>.azurewebsites.net.

3. When you're ready to complete the pending swap, select Complete Swap in Swap action and select Complete Swap.

   To cancel a pending swap, select Cancel Swap instead.

4. When you're finished, close the dialog box by selecting Close.

If you have any problems, see Troubleshoot swaps.

To automate a multi-phase swap, see Automate with PowerShell.

Roll back a swap

If any errors occur in the target slot (for example, the production slot) after a slot swap, restore the slots to their pre-swap states by swapping the same two slots immediately.

Configure auto swap

Note

Auto swap isn't supported in web apps on Linux.

Auto swap streamlines Azure DevOps scenarios where you want to deploy your app continuously with zero cold starts and zero downtime for customers of the app. When auto swap is enabled from a slot into production, every time you push your code changes to that slot, App Service automatically swaps the app into production after it's warmed up in the source slot.

Note

Before you configure auto swap for the production slot, consider testing auto swap on a non-production target slot.

To configure auto swap:

1. Go to your app's resource page. Select Deployment slots > <desired source slot> > Configuration > General settings.

2. For Auto swap enabled, select On. Then select the desired target slot for Auto swap deployment slot, and select Save on the command bar.

3. Execute a code push to the source slot. Auto swap happens after a short time, and the update is reflected at your target slot's URL.

If you have any problems, see Troubleshoot swaps.

Specify custom warm-up

Some apps might require custom warm-up actions before the swap. The applicationInitialization configuration element in web.config lets you specify custom initialization actions. The swap operation waits for this custom warm-up to finish before swapping with the target slot. Here's a sample web.config fragment.

For more information on customizing the applicationInitialization element, see Most common deployment slot swap failures and how to fix them.

You can also customize the warm-up behavior with one or both of the following app settings:

• WEBSITE_SWAP_WARMUP_PING_PATH: The path to ping to warm up your site. Add this app setting by specifying a custom path that begins with a slash as the value. An example is /statuscheck. The default value is /.
• WEBSITE_SWAP_WARMUP_PING_STATUSES: Valid HTTP response codes for the warm-up operation. Add this app setting with a comma-separated list of HTTP codes. An example is 200,202 . If the returned status code isn't in the list, the warmup and swap operations are stopped. By default, all response codes are valid.

Note

The <applicationInitialization> configuration element is part of each app start-up, whereas the two warm-up behavior app settings apply only to slot swaps.

If you have any problems, see Troubleshoot swaps.

Monitor a swap

If the swap operation takes a long time to complete, you can get information on the swap operation in the activity log.

On your app's resource page in the portal, in the left pane, select Activity log.

A swap operation appears in the log query as Swap Web App Slots. You can expand it and select one of the suboperations or errors to see the details.

Route traffic

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By default, all client requests to the app's production URL (http://<app_name>.azurewebsites.net) are routed to the production slot. You can route a portion of the traffic to another slot. This feature is useful if you need user feedback for a new update, but you're not ready to release it to production.

Route production traffic automatically

To route production traffic automatically:

1. Go to your app's resource page and select Deployment slots.

2. In the Traffic % column of the slot you want to route to, specify a percentage (between 0 and 100) to represent the amount of total traffic you want to route. Select Save.

After the setting is saved, the specified percentage of clients is randomly routed to the non-production slot.

After a client is automatically routed to a specific slot, it's 'pinned' to that slot for the life of that client session. On the client browser, you can see which slot your session is pinned to by looking at the x-ms-routing-name cookie in your HTTP headers. A request that's routed to the 'staging' slot has the cookie x-ms-routing-name=staging. A request that's routed to the production slot has the cookie x-ms-routing-name=self.

Note

Next to the Azure portal, you can also use the az webapp traffic-routing set command in the Azure CLI to set the routing percentages from CI/CD tools like DevOps pipelines or other automation systems.

Route production traffic manually

In addition to automatic traffic routing, App Service can route requests to a specific slot. This is useful when you want your users to be able to opt in to or opt out of your beta app. To route production traffic manually, you use the x-ms-routing-name query parameter.

To let users opt out of your beta app, for example, you can put this link on your webpage:

The string x-ms-routing-name=self specifies the production slot. After the client browser accesses the link, it's redirected to the production slot. Every subsequent request has the x-ms-routing-name=self cookie that pins the session to the production slot.

To let users opt in to your beta app, set the same query parameter to the name of the non-production slot. Here's an example:

By default, new slots are given a routing rule of 0%, shown in grey. When you explicitly set this value to 0% (shown in black text), your users can access the staging slot manually by using the x-ms-routing-name query parameter. But they won't be routed to the slot automatically because the routing percentage is set to 0. This is an advanced scenario where you can 'hide' your staging slot from the public while allowing internal teams to test changes on the slot.

Delete a slot

Search for and select your app. Select Deployment slots > <slot to delete> > Overview. The app type is shown as App Service (Slot) to remind you that you're viewing a deployment slot. Select Delete on the command bar.

Automate with PowerShell

Note

This article has been updated to use the new Azure PowerShell Azmodule. You can still use the AzureRM module, which will continue to receive bug fixes until at least December 2020.To learn more about the new Az module and AzureRM compatibility, seeIntroducing the new Azure PowerShell Az module. ForAz module installation instructions, see Install Azure PowerShell.

Azure PowerShell is a module that provides cmdlets to manage Azure through Windows PowerShell, including support for managing deployment slots in Azure App Service.

For information on installing and configuring Azure PowerShell, and on authenticating Azure PowerShell with your Azure subscription, see How to install and configure Microsoft Azure PowerShell.

Create a web app

Create a slot

Initiate a swap with a preview (multi-phase swap), and apply destination slot configuration to the source slot

Cancel a pending swap (swap with review) and restore the source slot configuration

Swap deployment slots

Monitor swap events in the activity log

Delete a slot

Automate with Resource Manager templates

Azure Resource Manager templates are declarative JSON files used to automate the deployment and configuration of Azure resources. To swap slots by using Resource Manager templates, you will set two properties on the Microsoft.Web/sites/slots and Microsoft.Web/sites resources:

• buildVersion: this is a string property which represents the current version of the app deployed in the slot. For example: 'v1', '1.0.0.1', or '2019-09-20T11:53:25.2887393-07:00'.
• targetBuildVersion: this is a string property that specifies what buildVersion the slot should have. If the targetBuildVersion does not equal the current buildVersion, then this will trigger the swap operation by finding the slot which has the specified buildVersion.

Example Resource Manager template

The following Resource Manager template will update the buildVersion of the staging slot and set the targetBuildVersion on the production slot. This will swap the two slots. The template assumes you already have a webapp created with a slot named 'staging'.

This Resource Manager template is idempotent, meaning that it can be executed repeatedly and produce the same state of the slots. After the first execution, targetBuildVersion will match the current buildVersion, so a swap will not be triggered.

Automate with the CLI

For Azure CLI commands for deployment slots, see az webapp deployment slot.

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Troubleshoot swaps

If any error occurs during a slot swap, it's logged in D:homeLogFileseventlog.xml. It's also logged in the application-specific error log.

Here are some common swap errors:

• An HTTP request to the application root is timed. The swap operation waits for 90 seconds for each HTTP request, and retries up to 5 times. If all retries are timed out, the swap operation is stopped.

• Local cache initialization might fail when the app content exceeds the local disk quota specified for the local cache. For more information, see Local cache overview.

• During custom warm-up, the HTTP requests are made internally (without going through the external URL). They can fail with certain URL rewrite rules in Web.config. For example, rules for redirecting domain names or enforcing HTTPS can prevent warm-up requests from reaching the app code. To work around this issue, modify your rewrite rules by adding the following two conditions:

• Without a custom warm-up, the URL rewrite rules can still block HTTP requests. To work around this issue, modify your rewrite rules by adding the following condition:

• After slot swaps, the app may experience unexpected restarts. This is because after a swap, the hostname binding configuration goes out of sync, which by itself doesn't cause restarts. However, certain underlying storage events (such as storage volume failovers) may detect these discrepancies and force all worker processes to restart. To minimize these types of restarts, set the WEBSITE_ADD_SITENAME_BINDINGS_IN_APPHOST_CONFIG=1 app setting on all slots. However, this app setting does not work with Windows Communication Foundation (WCF) apps.

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Next steps