IIS binding switch for Blue-Green Deployment

SwitchBlueToGreen.ps1

param (
    [string]$blueSiteName = "testblue.mydomain.com",
    [string]$greenSiteName = "testgreen.mydomain.com",
    [string]$ipAddress = "192.168.1.108",
    [int]$httpPort = 80,
    [int]$httpsPort = 443,
    [string]$certificateThumbprint = "20437383726bb2e609619ee345825c4854ab0598",
    [string]$certificateStore = "My"
)

Write-Host "Traffic switching from $blueSiteName to $greenSiteName ..."

# Import the WebAdministration module
Import-Module IISAdministration

# Display existing bindings for Blue environment
Write-Host "Existing bindings for $blueSiteName :"

$existingBindings = Get-IISSiteBinding -Name $blueSiteName

# Create a copy of the collection to avoid "Collection was modified" error
$bindingsCopy = @()

foreach ($binding in $existingBindings) {
	$bindingInfo = $binding.BindingInformation
# Do not copy blue website's blue tagged binding, because we want to keep it to prevent blue website stopped by IIS.
	if ($bindingInfo -notlike "*blue*") {
		$bindingsCopy += $binding
	}
}

# Remove existing bindings for Blue environment
foreach ($binding in $bindingsCopy) {    
	$bindingInfo = $binding.BindingInformation
	
	Write-Host "Removing binding: $bindingInfo "
				
	Remove-IISSiteBinding -Name $blueSiteName -BindingInformation $bindingInfo -Confirm:$false  -Protocol $binding.Protocol -RemoveConfigOnly    
}

Reset-IISServerManager -Confirm:$false

# Add bindings for Green environment
foreach ($binding in $bindingsCopy) {	
    if ($binding.Protocol -eq "http") {
        New-IISSiteBinding -Name $greenSiteName -BindingInformation $binding.BindingInformation -Protocol http
    }
    elseif ($binding.Protocol -eq "https") {
        New-IISSiteBinding -Name $greenSiteName -BindingInformation $binding.BindingInformation -CertificateThumbPrint $certificateThumbprint -CertStoreLocation "Cert:\LocalMachine\$certificateStore" -Protocol https
    }
}

Reset-IISServerManager -Confirm:$false
Write-Host "Traffic switched from $blueSiteName to $greenSiteName."