How to setup EventHub disasterRecoveryConfigs using Azure bicep? - azure-eventhub

Question

I have created a module 'resources.bicep' to create event hub namespace in two regions.
resource eventHubNamespace 'Microsoft.EventHub/namespaces#2021-11-01' = {
name: resourceName
location: location
sku: {
name:'Standard'
tier:'Standard'
capacity:1
}
}
resource eventHub 'Microsoft.EventHub/namespaces/eventhubs#2021-11-01' = if (shortRegion == 'wus2') {
name: 'city-temprature'
parent: eventHubNamespace
properties: {
messageRetentionInDays: 1
partitionCount: 2
}
}
From the parent bicep file I run the module as
module weatherWest 'resources.bicep' = {
name:'westResources'
scope:resourceGroup('${name}-wus2')
params: {
name: name
shortRegion: 'wus2'
location: 'westus2'
}
}
module weatherEast 'resources.bicep' = {
name:'eastResources'
scope:resourceGroup('${name}-eus2')
params: {
name: name
shortRegion: 'eus2'
location: 'eastus2'
}
}
How do I setup the GeoPairing?
I have not found a way to call Microsoft.EventHub/namespaces/disasterRecoveryConfigs#2021-11-01 from the parent bicep file.
Code is located in this branch
https://github.com/xavierjohn/SearchIndexDisasterRecoverNearRealTime/blob/bicep/bicep/weatherResources.bicep

Answer 1

Per the docs,
you need to specify a parent resource. You can look up an existing resource with the existing keyword.
Something along these lines should work.
resource primary 'Microsoft.EventHub/namespaces#2021-11-01' existing = {
name: 'primaryEventHubName'
resource secondary 'Microsoft.EventHub/namespaces#2021-11-01' existing = {
name: 'secondaryEventHubName'
resource symbolicname 'Microsoft.EventHub/namespaces/disasterRecoveryConfigs#2021-11-01' = {
name: 'foo'
parent: primary
properties: {
alternateName: 'string'
partnerNamespace: secondary.id
}
}

Answer 2

I got help from the Azure Bicep team and currently there is no way to pass a resource as output but they are working on a proposal. For now there is a trick that will work so till the elegant solution comes out,
use existing and set dependsOn on the Geo Pairing fragment.
The end code looks like below.
module allResources 'resources.bicep' = [for location in locations : {
name:'allResources'
scope:resourceGroup('${name}-${location.shortRegion}')
params: {
name: name
shortRegion: location.shortRegion
location: location.region
}
}]
resource primaryEventHubNamespace 'Microsoft.EventHub/namespaces#2021-11-01' existing = {
name: '${name}wus2'
}
resource disasterRecoveryConfigs 'Microsoft.EventHub/namespaces/disasterRecoveryConfigs#2021-11-01' = {
name: name
parent: primaryEventHubNamespace
properties: {
partnerNamespace: resourceId('${name}-eus2', 'Microsoft.EventHub/namespaces', '${name}eus2')
}
dependsOn: [
allResources
]
}