You have 3 azure instances (VMs) that you need to provison in 3 diff availability zones under the same region? how do you automate provisioning this infrastructure using power shell?

Question

In azure cloud 3 instances like VM's, these 3 VM's should be deployed in 3 diff virtual networks and under 3 availability zones, so we achieve High Availability,in case one of the availability zone goes offline (down) my app still run through other availability zone, all 3 availability zones are under single region say East US so how will you write power shell for this or how will you automate this infrastructure provisioning on azure cloud?

Answer 1

Hello @Prasad ,
Please use the below customized script.
Below PowerShell script will create 3 Ubuntu VMs in 3 different Availability Zones

$ResourceGroup = "AvailabilityZonesDemo" #ResourceGroupname (All the VMs will be created under single resource group)
$Location = "EastUS" #Location where to create the VMs
$vNetName = "avzone-vnet" # VirtualNetwork name
$AddressSpace = "10.10.0.0/16" #Address space for VNET
$SubnetIPRange = "10.10.1.0/24" #Subnet under the VNET
$SubnetName = "avzone-subnet" #SubnetName
$nsgName = "avzone-multi" #NSG rules for the VMs

New-AzureRmResourceGroup -Name $ResourceGroup -Location $Location

Create Virtual Network and Subnet

$vNetwork = New-AzureRmVirtualNetwork -ResourceGroupName $ResourceGroup -Name $vNetName -AddressPrefix $AddressSpace -Location $location
Add-AzureRmVirtualNetworkSubnetConfig -Name $SubnetName -VirtualNetwork $vNetwork -AddressPrefix $SubnetIPRange
Set-AzureRmVirtualNetwork -VirtualNetwork $vNetwork

Create Network Security Group

$nsgRuleVMAccess = New-AzureRmNetworkSecurityRuleConfig -Name 'allow-vm-access' -Protocol Tcp -Direction Inbound -Priority 100 -SourceAddressPrefix * -SourcePortRange * -DestinationAddressPrefix * -DestinationPortRange 22,3389 -Access Allow
New-AzureRmNetworkSecurityGroup -ResourceGroupName $ResourceGroup -Location $location -Name $nsgName -SecurityRules $nsgRuleVMAccess

Define Variables needed for Virtual Machine

$vNet = Get-AzureRmVirtualNetwork -ResourceGroupName $ResourceGroup -Name $vNetName
$Subnet = Get-AzureRmVirtualNetworkSubnetConfig -Name $SubnetName -VirtualNetwork $vNet
$nsg = Get-AzureRmNetworkSecurityGroup -ResourceGroupName $ResourceGroup -Name $NsgName
$vmName = "VMName"
$pubName = "Canonical"
$offerName = "UbuntuServer"
$skuName = "18.04-LTS"
$vmSize = "Standard_Ds1_v2" #Change the SKU size accordingly
$pipName = "$vmName-pip"
$nicName = "$vmName-nic"
$osDiskName = "$vmName-OsDisk"
$osDiskSize = "30"
$osDiskType = "Premium_LRS"

Create Admin Credentials

$adminUsername = 'admin'
$adminPassword = 'Password1234567$'

[String] [ValidateNotNullOrEmpty()] $secpasswd = "Password1234567"
[SecureString] $secpasswd = ConvertTo-SecureString -String "Password1234567" -AsPlainText -Force
[PSCredential] $adminCreds = New-Object System.Management.Automation.PSCredential (“fortuneuser”, $secpasswd)

//Below code will create 3 Virtual Machines in different Availability zones
for($i=1;$i -le 3;$i++){

// Create a public IP and NIC
$pip = New-AzureRmPublicIpAddress -Name $pipName$i -ResourceGroupName $ResourceGroup -Location $location -AllocationMethod Static -Zone $i -Sku Standard
$nic = New-AzureRmNetworkInterface -Name $nicName$i -ResourceGroupName $ResourceGroup -Location $location -SubnetId $Subnet.Id -PublicIpAddressId $pip.Id -NetworkSecurityGroupId $nsg.Id

Set VM Configuration

$vmConfig = New-AzureRmVMConfig -VMName $vmName$i -VMSize $vmSize -Zone $i
Add-AzureRmVMNetworkInterface -VM $vmConfig -Id $nic.Id

Set VM operating system parameters

Set-AzureRmVMOperatingSystem -VM $vmConfig -Linux -ComputerName $vmName -Credential $adminCreds

Set boot diagnostic storage account

Set-AzureRmVMBootDiagnostics -Enable -ResourceGroupName $ResourceGroup -VM $vmConfig #-StorageAccountName $StorageAccount

Set virtual machine source image

Set-AzureRmVMSourceImage -VM $vmConfig -PublisherName $pubName -Offer $offerName -Skus $skuName -Version 'latest'

Set OsDisk configuration

Set-AzureRmVMOSDisk -VM $vmConfig -Name $osDiskName$i -DiskSizeInGB $osDiskSize -StorageAccountType $osDiskType -CreateOption fromImage

Create the VM

New-AzureRmVM -ResourceGroupName $ResourceGroup -Location $location -VM $vmConfig
}

You can use the below reference document
https://learn.microsoft.com/en-us/azure/virtual-machines/windows/create-powershell-availability-zone

Let me know if you have additional questions.

Regards,
Shiva.