CODEWITHSUNDEEP
azure-eventgrid
Alex
Alex

Reputation: 3345

Azure Event Grid Subscriptions on custom topic in different resource group

I am trying to subscribe to a custom event grid topic that exists on a different resource group. For example if I have a custom event grid topic my-custom-topic in a resource group publisher-group. How do I create an event grid subscription to my topic from within the resource group subscriber-group?

The following ARM template only works if the my-custom-topic is in the same resource group that I am applying the template too

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "eventGridSubscriptionName": {
            "type": "String",
            "metadata": {
                "description": "The name of the Event Grid custom topic's subscription."
            }
        },
        "location": {
            "defaultValue": "[resourceGroup().location]",
            "type": "String",
            "metadata": {
                "description": "The location in which the Event Grid resources should be deployed."
            }
        }
    },
    "resources": [
        {
            "type": "Microsoft.EventGrid/topics/providers/eventSubscriptions",
            "apiVersion": "2018-01-01",
            "name": "[concat('my-custom-topic', '/Microsoft.EventGrid/', parameters('eventGridSubscriptionName'))]",
            "location": "[parameters('location')]",
            "properties": {
                "destination": {
                    "endpointType": "EventHub",
                    "properties": {
                        "resourceId": "..."
                    }
                },
                "filter": {
                    "includedEventTypes": [
                        "All"
                    ]
                }
            }
        }
    ]
}

If I change name to be a the full path of the topic (e.g. subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx/resourceGroups/publisher-group/providers/Microsoft.EventGrid/topics/my-custom-topic) then the template complains I have too many segments

I would have thought this was a very common use case having topics and subscriptions in different resource groups but I am unable to find concrete examples of this

How do I create an ARM template to subscribe to an event grid topic on a different resource group?

Upvotes: 6

Views: 1821

Answers (2)

irhetoric
irhetoric

Reputation: 361

While it is true that the subscription has to be in the same resource group as the topic, the actual resource that subscribes to the topic can be in ANY resource group, as specified in the resourceId of the destination. In other words, the subscription is tightly coupled to the topic, but the resource used by the subscription is not. This is definitely confusing and opposite of how you might think it would work.

Upvotes: 0

Phillip Harris
Phillip Harris

Reputation: 34

This isn't possible - Event Grid Topics and Subscriptions have to be in the same resource group.

I would suggest creating a separate resource group just for containing your Event Grid Topic and all of it's Subscriptions.

Logically you shouldn't think of a single event publisher as owning the Event Grid Topic it publishes to - rather think of a Topic as a shared resource which many publishers and subscribers depend on.

Upvotes: 1

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