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tutorial-provision-multiple-hubs.md

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Tutorial - Provision devices across load balanced hubs using Azure IoT Hub Device Provisioning Service
This tutorial demonstrates how Device Provisioning Service (DPS) enables automatic device provisioning across load balanced IoT hubs in the Azure portal.
kgremban
kgremban
10/18/2021
tutorial
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Tutorial: Provision devices across load-balanced IoT hubs

This tutorial shows how to provision devices for multiple, load-balanced IoT hubs using the Device Provisioning Service. In this tutorial, you learn how to:

[!div class="checklist"]

  • Use the Azure portal to provision a second device to a second IoT hub
  • Add an enrollment list entry to the second device
  • Set the Device Provisioning Service allocation policy to even distribution
  • Link the new IoT hub to the Device Provisioning Service

If you don't have an Azure subscription, create a free account before you begin.

Use the Azure portal to provision a second device to a second IoT hub

Follow the steps in the quickstarts to link a second IoT hub to your DPS instance and provision a device to that hub:

Add an enrollment list entry to the second device

The enrollment list tells the Device Provisioning Service which method of attestation (the method for confirming a device identity) it is using with the device. The next step is to add an enrollment list entry for the second device.

  1. In the page for your Device Provisioning Service, click Manage enrollments. The Add enrollment list entry page appears.
  2. At the top of the page, click Add.
  3. Complete the fields and then click Save.

Set the Device Provisioning Service allocation policy

The allocation policy is a Device Provisioning Service setting that determines how devices are assigned to an IoT hub. There are three supported allocation policies: 

  1. Lowest latency: Devices are provisioned to an IoT hub based on the hub with the lowest latency to the device.

  2. Evenly weighted distribution (default): Linked IoT hubs are equally likely to have devices provisioned to them. This is the default setting. If you are provisioning devices to only one IoT hub, you can keep this setting. If you plan to use on IoT hub, but expect to increase the number of hubs as the number of devices increases, it's important to note that, when assigning to an IoT Hub, the policy doesn't take into account previously registered devices. All linked hubs hold an equal chance of getting a device registration based on the weight of the linked IoT Hub. However, if an IoT hub has reached its device capacity limit, it will no longer receive device registrations. You can, however, adjust the weight of allocation for each linked IoT Hub.

  3. Static configuration via the enrollment list: Specification of the desired IoT hub in the enrollment list takes priority over the Device Provisioning Service-level allocation policy.

How the allocation policy assigns devices to IoT Hubs

It may be desirable to use only one IoT Hub, until a specific number of devices is reached. In that scenario, it's important to note that, once a new IoT Hub is added, a new device has the potential to be provisioned to any one of the IoT Hubs. If you wish to balance all devices, registered and unregistered, then you'll need to re-provision all devices.

Follow these steps to set the allocation policy:

  1. To set the allocation policy, in the Device Provisioning Service page click Manage allocation policy.
  2. Set the allocation policy to Evenly weighted distribution.
  3. Click Save.

Link the new IoT hub to the Device Provisioning Service

Link the Device Provisioning Service and IoT hub so that the Device Provisioning Service can register devices to that hub.

  1. In the All resources page, click the Device Provisioning Service you created previously.
  2. In the Device Provisioning Service page, click Linked IoT hubs.
  3. Click Add.
  4. In the Add link to IoT hub page, use the radio buttons to specify whether the linked IoT hub is located in the current subscription, or in a different subscription. Then, choose the name of the IoT hub from the IoT hub box.
  5. Click Save.

In this tutorial, you learned how to:

[!div class="checklist"]

  • Use the Azure portal to provision a second device to a second IoT hub
  • Add an enrollment list entry to the second device
  • Set the Device Provisioning Service allocation policy to even distribution
  • Link the new IoT hub to the Device Provisioning Service

Next steps