PS: Remove Azure NIC from LB Pool - azure

Question

I'm trying to remove Azure Load Balancer Backend Pool setting out of NIC Ipconfig in PowerShell but not succeeding without destroying whole Ipconfig. Either it removes entire config like
Remove-AzNetworkInterfaceIpConfig -NetworkInterface $NIC
Or when I was trying to set Ipconfig while naming other properties, LB pool config persists
Set-AzNetworkInterfaceIpConfig -NetworkInterface $NIC -Name "ipconfig1" -PrivateIpAddress $DIP -Subnet $backendSubnet -PublicIpAddress $PIP -ApplicationSecurityGroup $NSG
How can I only remove LB Backend Pool and keep the other properties? Thanks

Answer 1

If you want just remove or add specific NIC you can use this one. Just pass required variables and Action name "remove" or "add". It removes only NIC from Backend Load Balancer Pool, but didn't destroys whole Backend Pool configuration.
$ResourceGroup = "YourResourceGroupName"
$Loadbalancer = "YourLoadBalancerName"
$NICName = "YourVirtualMachineNetworkInterfaceName"
$Action = "remove" #add
if ($Action -eq 'add')
{
Write-Host ("Adding to LB")
$nic = Get-AzNetworkInterface | Where-Object { ($_.ResourceGroupName -eq "$ResourceGroup") -and ($_.Name -eq "$NICName") }
$lb = Get-AzLoadBalancer | Where-Object { ($_.ResourceGroupName -eq "$ResourceGroup") -and ($_.Name -eq "$Loadbalancer") }
$nic.IpConfigurations[0].LoadBalancerBackendAddressPools = $lb.BackendAddressPools[0]
Set-AzNetworkInterface -NetworkInterface $nic
}
if ($Action -eq 'remove')
{
Write-Host ("Removing from LB")
$nic = Get-AzNetworkInterface | Where-Object { ($_.ResourceGroupName -eq "$ResourceGroup") -and ($_.Name -eq "$NICName") }
$nic.Ipconfigurations[0].LoadBalancerBackendAddressPools = $null
Set-AzNetworkInterface -NetworkInterface $nic
}

Answer 2

What you need to do is not remove the Ipconfig of the NIC, but remove the nat rule config and backend pool config from the Load Balancer that associated with the Ipconfig of the NIC. And the example code here:
$resourceGrouName = "xxxxx"
$loabBalancerName = "xxxxx"
$inboundRuleConfigName = "xxxxx"
$backendpoolconfigName = "xxxxx"
$lb = Get-AzLoadBalancer -ResourceGroupName $resourceGrouName -Name $loabBalancerName
Remove-AzLoadBalancerInboundNatRuleConfig -LoadBalancer $lb -Name $inboundRuleConfigName
Remove-AzLoadBalancerBackendAddressPoolConfig -LoadBalancer $lb -Name $backendpoolconfigName
Set-AzLoadBalancer -LoadBalancer $lb
And you need to change the variables into yours. Then you can find the info about the Load Balancer that was removed from the Ipconfig of the NIC.

Answer 3

turns that you don't have to remove entire backend pool config but just modify NIC Ipconfig. I've tried
$DeactivateNIC = Get-AzNetworkInterface -ResourceGroupName $RG -Name $DeactivateNICName
$DeactivateNIC.IpConfigurations[0].LoadBalancerBackendAddressPools = $null
Set-AzNetworkInterface -NetworkInterface $DeactivateNIC
that works and LB pool stays. For adding I just add the Ipconfig property like:
$ActivateNIC = Get-AzNetworkInterface -ResourceGroupName $RG -Name $ActivateNICName
$lb = Get-AzLoadBalancer -ResourceGroupName $RG -Name "LB"
$lbPoolConfig = Get-AzLoadBalancerBackendAddressPoolConfig -LoadBalancer $lb
$ActivateNIC.IpConfigurations[0].LoadBalancerBackendAddressPools=$lbPoolConfig
Set-AzNetworkInterface -NetworkInterface $ActivateNIC