PowerShell :: Configure Hyper-V replication between a set of host servers.

HyperVReplicationSetup.ps1

<#
	Configures Hyper-V replication between a set of host servers.
	v1.0 - DPO - Aug. 2022
#>
#Requires -RunAsAdministrator
#Requires -Version 5.1
param (
	[string]$HostReplicaFolderPath = 'D:\ReplicaVMs',
	[switch]$LeaveExistingAllowedServers
)

$hvHosts = @(
	'HV-VMHost1.corp.company.com',
	'HV-VMHost2.corp.company.com',
	'HV-VMHost3.corp.company.com',
	'HV-VMHost4.corp.company.com'
)

# Prepare variables for internal use.
$HostReplicaFolderPath = $HostReplicaFolderPath -replace '\\$'
$hostReplicaFolderAdminUNC = $HostReplicaFolderPath -replace '^(.):\\','$1$\'

foreach ($hvHost in $hvHosts) {
	# Configure and enable HyperV replication on current server.
	Set-VMReplicationServer -ComputerName $hvHost `
		-ReplicationEnabled $true `
		-AllowedAuthenticationType Kerberos `
		-ReplicationAllowedFromAnyServer $false `
		-KerberosAuthenticationPort 80 `
		-CertificateAuthenticationPort 443

	# Create folder on host server to hold replica VMs.
	mkdir ('\\{0}\{1}' -f $hvHost, $hostReplicaFolderAdminUNC ) -Force

	if (!$LeaveExistingAllowedServers) {
		# Wipe all existing Allowed Servers.
		Get-VMReplicationAuthorizationEntry -ComputerName $hvHost `
			| Remove-VMReplicationAuthorizationEntry
	}

	# Populate Allowed Servers list with other host servers.
	foreach ($allowedHvHost in $hvHosts) {
		if ($allowedHvHost -ne $hvHost) {

			# Create a subfolder to hold the replica VMs from other host server.
			mkdir ('\\{0}\{1}\From_{2}' -f $hvHost, $hostReplicaFolderAdminUNC, $allowedHvHost) -Force

			# Add host server to the Allowed Servers list.
			New-VMReplicationAuthorizationEntry -ComputerName $hvHost `
				-AllowedPrimaryServer $allowedHvHost `
				-TrustGroup 'Our Company HV Host Servers' `
				-ReplicaStorageLocation ('{0}\From_{1}' -f $HostReplicaFolderPath, $allowedHvHost)
		}
	}
}