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Create logical networks for Kubernetes clusters on Azure Stack HCI 23H2

  • Article

Applies to: Azure Stack HCI, version 23H2

After you install and configure Azure Stack HCI 23H2, you must create Arc VM logical networks. AKS on Azure Stack HCI uses static logical networks to provide IP addresses to the underlying VMs of the AKS clusters.

Before you begin

Before you begin, make sure you have the following prerequisites:

  • Install and configure Azure Stack HCI 23H2. Make sure you have the custom location Azure Resource Manager ID, as this ID is a required parameter for creating a logical network.
  • Make sure that the logical network you create contains enough usable IP addresses to avoid IP address exhaustion. IP address exhaustion can lead to Kubernetes cluster deployment failures. For more information, see Networking concepts in AKS on Azure Stack HCI 23H2.
  • Make sure you have an external VM switch that can be accessed by all the servers in your Azure Stack HCI cluster. By default, an external switch is created during the deployment of your Azure Stack HCI cluster that you can use to associate with the logical network you will create.

Run the following command to get the name of the external VM switch on your Azure Stack HCI cluster:

Get-VmSwitch -SwitchType External

Make a note of the name of the switch. You use this information when you create a logical network. For example:

Get-VmSwitch -SwitchType External

Name                               SwitchType       NetAdapterInterfaceDescription
----                               ----------       ----------------------------
ConvergedSwitch(management_compute_storage) External        Teamed-Interface

Create the logical network

You can create a logical network using either the Azure Command-Line Interface (CLI) or by using the Azure portal.

You can use the az stack-hci-vm network lnet create cmdlet to create a logical network on the VM switch in Static IP configuration.

For static IP, the required parameters are as follows:

Required parameters Description
--name Name for the logical network that you create for your Azure Stack HCI cluster. Make sure to provide a name that follows the rules for Azure resources. You can't rename a logical network after it's created.
--resource-group Name of the resource group where you create the logical network.
--subscription Name or ID of the subscription where your Azure Stack HCI is deployed.
--custom-location Provide the custom location associated with your Azure Stack HCI cluster where you're creating the logical network.
--vm-switch-name The name of the VM switch. Usage: --vm-switch-name "vm-switch-01".
--address-prefixes AddressPrefix for the network. Currently only 1 address prefix is supported. Usage: --address-prefixes "10.220.32.16/24".
--dns-servers Space-separated list of DNS server IP addresses. Usage: --dns-servers 10.220.32.16 10.220.32.17.
--gateway Gateway. The gateway IP address must be within the scope of the address prefix. Usage: --gateway 10.220.32.16.
--ip-allocation-method The IP address allocation method. Supported values are "Static". Usage: --ip-allocation-method "Static".
--ip-pool-start The start IP address of your IP pool. The address must be in range of the address prefix. Usage: --ip-pool-start "10.220.32.18".
--ip-pool-end The end IP address of your IP pool. The address must be in range of the address prefix. Usage: --ip-pool-end "10.220.32.38". 
az stack-hci-vm network lnet create --subscription $subscription --resource-group $resource_group --custom-location $customLocationID --name $lnetName --vm-switch-name $vmSwitchName --ip-allocation-method "Static" --address-prefixes $addressPrefixes --gateway $gateway --dns-servers $dnsServers --ip-pool-start $ipPoolStart --ip-pool-end $ipPoolEnd

Next steps

Create and manage Kubernetes clusters on-premises using Azure CLI