Create a custom topic or a domain in Azure Event Grid

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This article shows how to create a custom topic or a domain in Azure Event Grid.

Prerequisites

If you're new to Azure Event Grid, read through Event Grid overview before starting this tutorial.

Register the Event Grid resource provider

Unless you've used Event Grid before, you'll need to register the Event Grid resource provider. If you’ve used Event Grid before, skip to the next section.

In the Azure portal, do the following steps:

  1. On the left menu, select Subscriptions.

  2. Select the subscription you want to use for Event Grid from the subscription list.

  3. On the Subscription page, select Resource providers under Settings on the left menu.

  4. Search for Microsoft.EventGrid, and confirm that the Status is Not Registered.

  5. Select Microsoft.EventGrid in the provider list.

  6. Select Register on the command bar.

    Image showing the registration of Microsoft.EventGrid provider with the Azure subscription.

  7. Refresh to make sure the status of Microsoft.EventGrid is changed to Registered.

    Image showing the successful registration of Microsoft.EventGrid provider with the Azure subscription.

Create a custom topic or domain

An Event Grid topic provides a user-defined endpoint that you post your events to.

  1. Sign in to Azure portal.

  2. In the search bar at the top, type Event Grid Topics, and then select Event Grid Topics from the drop-down list. To create a domain, search for Event Grid Domains.

    Screenshot showing the Azure port search bar to search for Event Grid topics.

  3. On the Event Grid Topics or Event Grid Domains page, select + Create on the toolbar.

    Screenshot showing the Create Topic button on Event Grid topics page.

Basics page

On the Basics page of Create Topic or Create Event Grid Domain wizard, follow these steps:

  1. Select your Azure subscription.

  2. Select an existing resource group or select Create new, and enter a name for the resource group.

  3. Provide a unique name for the custom topic or domain. The name must be unique because it's represented by a Domain Name System (DNS) entry. Don't use the name shown in the image. Instead, create your own name - it must be between 3-50 characters and contain only values a-z, A-Z, 0-9, and "-".

  4. Select a location for the Event Grid topic or domain.

  5. Select Next: Networking at the bottom of the page to switch to the Networking page.

    Screenshot showing the Networking page of the Create Topic wizard.

Networking page

On the Networking page of the Create Topic or Create Event Grid Domain wizard, follow these steps:

  1. If you want to allow clients to connect to the topic or domain endpoint via a public IP address, keep the Public access option selected. You can restrict the access to specific IP addresses or IP address range.

    Screenshot showing the selection of Public access option on the Networking page of the Create topic wizard.

  2. To allow access to the topic or domain via a private endpoint, select the Private access option.

    Screenshot showing the selection of Private access option on the Networking page of the Create topic wizard.

  3. Follow instructions in the Add a private endpoint using Azure portal section to create a private endpoint.

  4. Select Next: Security at the bottom of the page to switch to the Security page.

Security page

On the Security page of the Create Topic or Create Event Grid Domain wizard, follow these steps:

  1. To assign a system-assigned managed identity to your topic or domain, select Enable system assigned identity.

    Screenshot of the Identity page with system assigned identity option selected.

  2. To assign a user-assigned identity, select Add user assigned identity in the User assigned identity section of the page.

  3. In the Select user assigned identity window, select the subscription that has the user-assigned identity, select the user-assigned identity, and then click Select.

    Screenshot of the Identity page with user assigned identity option selected.

  4. To disable local authentication, select Disabled. When you do it, the topic or domain can't be accessed using accesskey and SAS authentication, but only via Microsoft Entra authentication.

    Screenshot showing the Advanced tab of Create Topic page when you can disable local authentication.

  5. Configure the minimum required Transport Layer Security (TLS) version. For more information, see Configure minimum TLS version.

    Screenshot showing the Advanced tab of Create Topic page when you can select the minimum TLS version.

  6. Select Advanced at the bottom of the page to switch to the Advanced page.

Advanced page

  1. On the Advanced page of the Create Topic or Create Event Grid Domain wizard, select the schema for events that will be published to this topic.

    Screenshot showing the selection of a schema on the Advanced page.

  2. For Data residency, select whether you don't want any data to be replicated to another region (Regional) or you want the metadata to be replicated to a predefined secondary region (Cross-Geo).

    Screenshot showing the Data residency section of the Advanced page in the Create Topic wizard.

    The Cross-Geo option allows Azure-initiated failover to the paired region when there's a region failure. For more information, see Server-side geo disaster recovery in Azure Event Grid. Azure-initiated failover is exercised by Microsoft in rare situations to fail over Event Grid resources from an affected region to the corresponding geo-paired region. This process doesn't require an intervention from user. Microsoft reserves right to make a determination of when this path will be taken. The mechanism doesn't involve a user consent before the user's topic or domain is failed over. For more information, see How do I recover from a failover?.

    If you select the Regional option, you can define your own disaster recovery plan.

  3. Select Next: Tags to move to the Tags page.

Tags page

The Tags page has no fields that are specific to Event Grid. You can assign a tag (name-value pair) as you do for any other Azure resource. Select Next: Review + create to switch to the Review + create page.

Review + create page

On the Review + create page, review all your settings, confirm the validation succeeded, and then select Create to create the topic or the domain.

Screenshot showing the Review + create page.

Next steps

Now that you know how to create custom topics or domains, learn more about what Event Grid can help you do:

See the following samples to learn about publishing events to and consuming events from Event Grid using different programming languages.