This help article contains step-by-step instructions for setting up peering in Azure. See the Using VPC peering article for how to set up a Project VPC. This creates an isolated virtual network in the Aiven subcription where you can create services instead of the Aiven cloud's public network.

Peer your network with the VPC

For an Azure virtual network peering's state to become connected between networks A and B, a peering must be created both from network A to B and from B to A. See this for an overview. In the case of Project VPCs, one of the networks is located in the Aiven subscription and the Aiven platform handles creating the peering from that network to the network you wish to peer. For this the Aiven platform's Active Directory application object needs permissions in your subscription. Because the peering is between subscriptions with different AD tenants, an application object is also needed to your AD tenant, which can be used to create the peering from your network to Aiven once it's been given permissions to do so.

Preparation

The support for cross tenant peerings is relatively new, and the Azure portal does not yet have full support for this. Managing most of the resources in this guide currently only works with the Azure CLI, but can typically be viewed with the web console.

Likewise the Aiven CLI is needed to set up peering connections for Azure currently - web console support is coming soon. 

1. Log in with an Azure admin account

Using the Azure CLI:

az account clear
az account login

This should open a window in your browser prompting to choose an Azure account to log in with. An administrator account will be needed for the later steps.
If you manage multiple Azure subscriptions, also configure the Azure CLI to default to the correct subscription for the subsequent commands. This is not needed if there's only one subscription:

az account set --subscription <subscription name or id> 

2. Create application object

Create an application object in your AD tenant. Using the Azure CLI, this can be done with:

az ad app create --display-name "<name of your choosing>" --available-to-other-tenants --key-type Password

This creates an entity to your AD that can be used to log into multiple AD tenants (--available-to-other-tenants ), but only the home tenant (the tenant the app was created in) has the credentials to authenticate the app. Save the appId  field from the output - this will be refered to as $user_app_id

3. Create a service principal for your app object

Create a service principal for the app object you created. The service principal should be created to the Azure subscription the VNet you wish to peer is located in:

az ad sp create --id $user_app_id

 This creates a service principal to your subscription that may given permissions to peer your VNet. Save the objectId  field from the output - this will be referred to as $user_sp_id . Notice that this is different from the $user_app_id value earlier, which is also shown in the output.

4. Set a password for your app object

az ad app credential reset --id $user_app_id

Save the password  field from the output - this will be referred to as $user_app_secret below

5. Find the id properties of your virtual network

This can be found in the Azure portal in "Virtual networks" -> name of your network -> "Properties" -> "Resource ID", or using

az network vnet list

Save the id field which will be referred to as $user_vnet_id . Also grab

  • the Azure Subscription ID ("Properties" -> "Subscription ID") or the part after /subscriptions/ in the resource ID. This is referred to as $user_subscription_id
  •  the resource group name ("Properties" -> "Resource group") or the resourceGroup  field in the output. This is referred to as $user_resource_group
  • the Vnet name (title of the network page), or the name  field from the output. Save this for later as $user_vnet_name

$user_vnet_id should have the format /subscriptions/$user_subscription_id/resourceGroups/$user_resource_group/providers/Microsoft.Network/virtualNetworks/$user_vnet_name 

6. Grant your service principal permissions to peer

The service principal created in step 3 needs to be assigned a role that has permission for the Microsoft.Network/virtualNetworks/virtualNetworkPeerings/write  action on the scope of your VNet. To limit the amount of permissions the app object and service principal has, you can create a custom role with just that permission. The built-in Network Contributor role includes that permission, and can be found using the Azur CLI with 

az role definition list --name "Network Contributor"

The id  field from the output will be used as $network_contributor_role_id  to assign the service principal that role:

az role assignment create --role $network_contributor_role_id --assignee-object-id $user_sp_id --scope $user_vnet_id

This allows the application object created earlier to manage the network in the --scope  above. Since the application object is controlled by you, it may also be given permission for the scope of an entire resource group, or the whole subscription to allow create other peerings later without assigning the role again for each VNet separately.

7. Create a service principal for the Aiven application object

The Aiven AD tenant contains an application object (similar to the one you created in step 2 that the Aiven platform uses to create a peering from the Project VPC VNet in the Aiven subcription to the VNet from step 5 in your subscription. For this the Aiven app object needs a service principal in your subscription:

az ad sp create --id 55f300d4-fc50-4c5e-9222-e90a6e2187fb

The argument to --id  field above is the ID of the Aiven application object. Save the objectId field from the output - it will be referred to as $aiven_sp_id  later

8. Create a custom role for the Aiven application object

The Aiven application now has a service principal that can be given permissions. In order to target a network in your subscription with a peering and nothing else, we'll create a this a custom role definition, with only a single action allowing to do that and only that:

az role definition create --role-definition '{"Name": "<name of your choosing>", "Description": "Allows creating a peering to vnets in scope (but not from)", "Actions": ["Microsoft.Network/virtualNetworks/peer/action"], "AssignableScopes": ["/subscriptions/'$user_subscription_id'"]}'

Creating a custom role must include your subscription's id in AssignableScopes . This in itself does not give permissions to your subscription - it merely restricts which scopes a role assignment can include. Save the id  field from the output - this will be referred to as $aiven_role_id 

9. Assign the custom role to the Aiven service principal

To give the Aiven application object's service principal permissions to peer with your VNet, assign the role created in the previous step to the Aiven service principal (step 7) with the scope of your VNet (step 5) with

az role assignment create --role $aiven_role_id --assignee-object-id $aiven_sp_id --scope $user_vnet_id

10. Find your AD tenant id

The ID of your AD tenant will be needed in the next step. Find it from the Azure portal from "Azure Active Directory" -> "Properties" -> "Directory ID" or with the Azure CLI using 

az account list

saving the tenantId  field from the output. It will be referred to as $user_tenant_id later

11. Create a peering connection from the Aiven Project VPC

This leads to the Aiven platfrom creating a peering from the VNet in the Aiven Project VPC to the VNet in your subscription. In addition it will create a service principal for the application object in your tenant (--peer-azure-app-id $user_app_id ) giving it permission to target the Aiven subscription VNet with a peering. Your AD tenant ID is also needed in order for the Aiven application object to authenticate with your tenant to give it access to the service principal created in step 7 (--peer-azure-tenant-id $user_tenant_id ).

$aiven_project_vpc_id is the ID of the Aiven Project VPC, and can be found with avn vpc list

Using the Aiven CLI:

avn vpc peering-connection create --project-vpc-id $aiven_project_vpc_id --peer-cloud-account $user_subscription_id --peer-resource-group $user_resource_group --peer-vpc $user_vnet_name --peer-azure-app-id $user_app_id --peer-azure-tenant-id $user_tenant_id

Note that the arguments starting with $user_ should be given in lower case. Azure resource names are case-agnostic, but the Aiven API currently only accepts names in lower case. If no error is shown, the peering connection is being set up by the Aiven platform.

12. Wait for the Aiven platform to set up the connection

Run the following command until the state is no longer APPROVED , but PENDING_PEER

avn vpc peering-connection get -v --project-vpc-id $aiven_project_vpc_id --peer-cloud-account $user_subscription_id --peer-resource-group $user_resource_group --peer-vpc $user_vnet_name

A state such as INVALID_SPECIFICATION  or REJECTED_BY_PEER  may be shown if the VNet specified in the previous step did not exist, or the Aiven app object wasn't given permissions to peer with it. If that occurs, check your configuration and then recreate the peering connection in step 12
If everything went as expected, the state changes to PENDING_PEER  within a couple of minutes showing details to set up the peering connection from your VNet to the Project VPC's VNet in the Aiven subscription.

Save the to-tenant-id  field from the output. It will be referred to as the aiven_tenant_id  later. The to-network-id  field from the output is referred to as the $aiven_vnet_id

13. Create peering from your VNet to the Project VPC's VNet

Log out the Azure user you logged in with in step 1 using

az account clear

Log in the application object you created with in step 2 to your AD tenant with

az login --service-principal -u $user_app_id -p $user_app_secret --tenant $user_tenant_id

Log in the same application object to the Aiven AD tenant

az login --service-principal -u $user_app_id -p $user_app_secret --tenant $aiven_tenant_id

Now that your application object has a session with both AD tenants, create a peering from your VNet to the VNet in the Aiven subscription with

az network vnet peering create --name <peering name of your choosing> --remote-vnet $aiven_vnet_id --vnet-name $user_vnet_name --resource-group $user_resource_group --allow-vnet-access

Note that without --allow-vnet-access no traffic is allowed to flow from the peered VNet and Aiven services cannot be reached through the peering. After the peering has been created the peering should be in state connected

In case you get the error below, it's possible the role assignment from step 6 hasn't taken effect yet. If that is the case, try logging in again and creating the peering again after waiting a bit by repeating the commands in this step. If the error message persists, please check the role assignment in step 6 was correct.

The client '<random uuid>' with object id '<another random uuid>' does not have authorization to perform action 'Microsoft.Network/virtualNetworks/virtualNetworkPeerings/write' over scope '$user_vnet_id' If access was recently granted, please refresh your credentials.

14. Wait until the Aiven peering connection is active

The Aiven platform polls peering connections in state PENDING_PEER regularly to see if the peer (your subscription) has created a peering connection to the Aiven Project VPC's VNet. Once this is detected, the state changes from PENDING_PEER  to ACTIVE. After this services in the Project VPC can be reached through the peering. To check if the peering connection is ACTIVE, run the same Aiven CLI avn vpc peering-connection get command from step 12. Note that it may take a few minutes for the state to update:

avn vpc peering-connection get -v --project-vpc-id $aiven_project_vpc_id --peer-cloud-account $user_subscription_id --peer-resource-group $user_resource_group --peer-vpc $user_vnet_name
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