AzureILBUpgrade

3.0

AzureILBUpgrade.ps1

                                
<#PSScriptInfo

.VERSION 3.0

.GUID 836ca1ab-93b7-49a3-b1d1-b257601da1dd

.AUTHOR Microsoft Corporation

.COMPANYNAME Microsoft Corporation

.COPYRIGHT Microsoft Corporation. All rights reserved.

.TAGS Azure, Az, LoadBalancer, AzNetworking

.LICENSEURI

.PROJECTURI

.ICONURI

.EXTERNALMODULEDEPENDENCIES 

.REQUIREDSCRIPTS

.EXTERNALSCRIPTDEPENDENCIES

.RELEASENOTES

.PRIVATEDATA

#>

<# 

.DESCRIPTION

This script will help you create a Standard SKU Internal load balancer with the same configuration as your Basic SKU load balancer.

.PARAMETER rgName

Name of ResourceGroup of Basic Internal Load Balancer and the Standard Internal Load Balancer, like "microsoft_rg1"

.PARAMETER oldLBName

Name of Basic Internal Load Balancer you want to upgrade.

.PARAMETER newlocation

Location where you want to place new Standard Internal Load Balancer in. For example, "centralus"

.PARAMETER newLBName

Name of the newly created Standard Internal Load Balancer.

.EXAMPLE

./AzureILBUpgrade.ps1 -rgName "test_InternalUpgrade_rg" -oldLBName "LBForInternal" -newlocation "centralus" -newLbName "LBForUpgrade"

.LINK

https://aka.ms/upgradeloadbalancerdoc

https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-overview/

.NOTES

Note - all paramemters are required in order to successfully create a Standard Internal Load Balancer.

#> 

Param(

[Parameter(Mandatory = $True)][string] $rgName,

[Parameter(Mandatory = $True)][string] $oldLBName,

#Parameters for new Standard Load Balancer

[Parameter(Mandatory = $True)][string] $newlocation,

[Parameter(Mandatory = $True)][string] $newLBName

)

#getting current loadbalancer

$lb = Get-AzLoadBalancer -ResourceGroupName $rgName -Name $oldLbName

#$originalIP = $lb.FrontendIpConfigurations[0].PrivateIpAddress

#1. Backend subnet is always the same as the front end ip config - automatic association

$vnetName = ($lb.FrontendIpConfigurations.subnet.id).Split("/")[8]

$vnet = Get-AzVirtualNetwork -Name $vnetName -ResourceGroupName $rgName

$backendSubnetName = $lb.FrontendIpConfigurations.subnet.id.Split("/")[10]

$backendSubnet = Get-AzVirtualNetworkSubnetConfig -Name $backendSubnetName -VirtualNetwork $vnet

$ipRange = ($backendSubnet.AddressPrefix).split("/")[0]

$newlbFrontendConfigs = $lb.FrontendIpConfigurations

$feProcessed = 1

$startIp = $ipRange.Split(".")[3] + 1

$startIPTest = $ipRange.Split(".")[0] + "." + $ipRange.Split(".")[1] + "." + $ipRange.Split(".")[2] + "." + $startIp

$availableIPS = (Test-AzPrivateIPAddressAvailability -VirtualNetwork $vnet -IPAddress $startIPTest).AvailableIPAddresses

$lastAvailableIp = $availableIPS[$availableIPS.count-1]

#initial bit in array to check for available ips

$i = 0

#creating array to store original ips

$frontEndArray=@()

#2. Front Ends

foreach ($frontEndConfig in $newlbFrontendConfigs)

{

    Get-AzLoadBalancerFrontendIpConfig -Name ($frontEndConfig).Name -LoadBalancer $lb

    $newFrontEndConfigName = $frontEndConfig.Name

    ##adding information to array

    $frontEndArray += $newFrontEndConfigName + "," + $frontEndConfig.PrivateIpAddress

    $newFrontEndIp = $availableIPS[$i]

    #$newFrontEndIp = $frontEndConfig.PrivateIpAddress

    $newSubnetId = $frontEndConfig.subnet.Id

    #2. create frontend config

    New-Variable -Name "frontEndIpConfig$feProcessed" -Value (New-AzLoadBalancerFrontendIpConfig -Name $newFrontEndConfigName -PrivateIpAddress $newFrontEndIp -SubnetId $newSubnetId)

    $feProcessed++

    $i++

}

$rulesFrontEndIpConfig = (Get-Variable -Include frontEndIpConfig*)

#3. create inbound nat rule configs

$newlbNatRules = $lb.InboundNatRules

##looping through NAT Rules

$ruleprocessed = 1

foreach ($natRule in $newlbNatRules)

{

    ##need to get correct frontend IP Config

    $frontEndName = (($natRule.FrontendIPConfiguration).id).Split("/")[10]

    $frontEndNameConfig = ((Get-Variable -Include frontEndIpConfig* | Where-Object {$_.Value.name -eq $frontEndName})).value

    New-Variable -Name "nat$ruleprocessed" -Value (New-AzLoadBalancerInboundNatRuleConfig -Name $natRule.name -FrontendIpConfiguration $frontEndNameConfig -Protocol $natRule.Protocol -FrontendPort $natRule.FrontendPort -BackendPort $natRule.BackendPort)

    $ruleprocessed++

}

$rulesNat = (Get-Variable -Include nat* | Where-Object {$_.Name -ne "natRule"})

##setting private ip to last available ip address - cannot be null

##adding a loop

$z = 0

$y = 1

foreach ($item in $newlbFrontendConfigs)

{

    $item.PrivateIpAddress = $availableIPS[$availableIPS.count-$y]

    $lb | Set-AzLoadBalancer

    $y++

    $z++

}

#4. Create loadbalancer

$newlb = New-AzLoadBalancer -ResourceGroupName $rgName -Name $newLbName -SKU Standard -Location $newlocation -FrontendIpConfiguration $rulesFrontEndIpConfig.Value  -InboundNatRule $rulesNat.Value #-outboundRule $outboundrule

#getting LB now after creation

$newlb = (Get-AzLoadBalancer  -ResourceGroupName $rgName -Name $newLbName)

#5. Probe configuration

$newProbes = Get-AzLoadBalancerProbeConfig -LoadBalancer $lb

foreach ($probe in $newProbes)

{

    $probeName = $probe.name

    $probeProtocol = $probe.protocol

    $probePort = $probe.port

    $probeInterval = $probe.intervalinseconds

    $probeRequestPath = $probe.requestPath

    $probeNumbers = $probe.numberofprobes

    $newlb | Add-AzLoadBalancerProbeConfig -Name $probeName -RequestPath $probeRequestPath -Protocol $probeProtocol -Port $probePort -IntervalInSeconds $probeInterval -ProbeCount $probeNumbers 

    $newlb | Set-AzLoadBalancer

}

#6. Backend configuration

$backendArray=@()

$newBackendPools = $lb.BackendAddressPools

$newlb = (Get-AzLoadBalancer -ResourceGroupName $rgName -Name $newLbName)

foreach ($newBackendPool in $newBackendPools)

{

    $existingBackendPoolConfig = Get-AzLoadBalancerBackendAddressPoolConfig -LoadBalancer $lb -Name ($newBackendPool).Name

    $newlb | Add-AzLoadBalancerBackendAddressPoolConfig -Name ($existingBackendPoolConfig).Name | Set-AzLoadBalancer

    $newlb = (Get-AzLoadBalancer -ResourceGroupName $rgName -Name $newLbName)

    #$newBackendPoolConfig

    $nics = (($lb.BackendAddressPools) | Where-Object {$_.Name -eq ($newBackendPool).name}).backendipconfigurations

    foreach ($nic in $nics)

    {

        $nicToAdd = Get-AzNetworkInterface -name ($nic.id).Split("/")[8] -ResourceGroupName $rgName

        #write-host "Reconfiguring $nicToAdd.Name"

        $nicToAdd.IpConfigurations[0].LoadBalancerBackendAddressPools = $null

        Set-AzNetworkInterface -NetworkInterface $nicToAdd

        $backendArray += ($newBackendPool).Name +"," + ($nicToAdd).id

    }

}

#7. Re-adding NICs to backend pool

foreach ($backendItem in $backendArray)  

{

    $newlb = (Get-AzLoadBalancer  -ResourceGroupName $rgName -Name $newLbName)

    #write-host "backend"

    $lbBackend = Get-AzLoadBalancerBackendAddressPoolConfig -name ($backendItem.Split(",")[0]) -LoadBalancer $newlb

    #$lbBackend

    #write-host "nic"

    $nicToAssociate = Get-AzNetworkInterface -name (($backendItem.Split(",")[1]).split("/")[8]) -resourcegroupname $rgName

    #$nicToAssociate

    $nicToAssociate.IpConfigurations[0].LoadBalancerBackendAddressPools = $lbBackend

    Set-AzNetworkInterface -NetworkInterface $nicToAssociate

}

#8. create load balancer rule config

$newlb = (Get-AzLoadBalancer -ResourceGroupName $rgName -Name $newLbName)

$newLbRuleConfigs = Get-AzLoadBalancerRuleConfig -LoadBalancer $lb

foreach ($newLbRuleConfig in $newLbRuleConfigs)

{

    $backendPool = (Get-AzLoadBalancerBackendAddressPoolConfig -LoadBalancer $newlb -Name ((($newLbRuleConfig.BackendAddressPool.id).split("/"))[10]))

    $lbFrontEndName = (($newLbRuleConfig.FrontendIPConfiguration).id).Split("/")[10]

    $lbFrontEndNameConfig = ((Get-Variable -Include frontEndIpConfig* | Where-Object {$_.Value.name -eq $lbFrontEndName})).value

    $newlb | Add-AzLoadBalancerRuleConfig -Name ($newLbRuleConfig).Name -FrontendIPConfiguration $lbFrontEndNameConfig -BackendAddressPool $backendPool -Probe (Get-AzLoadBalancerProbeConfig -LoadBalancer $newlb -Name (($newLbRuleConfig.Probe.id).split("/")[10])) -Protocol ($newLbRuleConfig).protocol -FrontendPort ($newLbRuleConfig).FrontendPort -BackendPort ($newLbRuleConfig).BackendPort -IdleTimeoutInMinutes ($newLbRuleConfig).IdleTimeoutInMinutes -EnableFloatingIP -LoadDistribution SourceIP -DisableOutboundSNAT

    $newlb | set-AzLoadBalancer

    foreach ($backendIpConfig in $backendPool.BackendIpConfigurations)

    {

        #$backendIpConfig

        $nicToAssociate = Get-AzNetworkInterface -name (($backendIpConfig.id).split("/")[8]) -ResourceGroupName $rgName

        #$nicToAssociate

        $nicToAssociate.IpConfigurations[0].LoadBalancerBackendAddressPools = $lbBackend

        Set-AzNetworkInterface -NetworkInterface $nicToAssociate

    }

}

#9. re-adding private ip addresses

foreach ($frontendItem in $frontEndArray)  

{

    $newlb = (Get-AzLoadBalancer  -ResourceGroupName $rgName -Name $newLbName)

    #$frontEndName

    $lbFrontEnd = Get-AzLoadBalancerFrontendIpConfig -LoadBalancer $newlb -Name ($frontendItem.Split(",")[0])

    $lbFrontEnd.PrivateIpAddress = ($frontEndItem.Split(",")[1])

    $newlb | set-AzLoadBalancer

}