Make configuring an IIS Server Farm easier

Add-ServerFarm.ps1

function Add-ServerFarm {

  [CmdletBinding(SupportsShouldProcess=$true)]
  param(
    [Parameter(Mandatory=$true)]
    [string]$Name,

    [Parameter(Mandatory=$true)]
    [string[]]$Servers,

    [string]$HostName,

    [string]$RootPath,

    [string]$HealthCheckPath='healthcheck',
    [string]$HealthCheckUrl,

    [switch]$IncludeNonSSL=$true,
    [switch]$IncludeSSL=$true,
    
    [string]$HealthCheckStatus='200',
    [string]$HealthCheckInterval='00:00:10',
    [string]$HealthCheckTimeout='00:00:02',
    [string]$PSPath = 'MACHINE/WEBROOT/APPHOST'
  )

    if (!$HealthCheckUrl) {
      if ($IncludeSSL) {
        $HealthCheckUrl = "https://$HostName"
      } else {
        $HealthCheckUrl = "http://$HostName"
      }

      if ($RootPath) {
        $HealthCheckUrl += "/$RootPath"
      }

      if ($HealthCheckPath) {
        $HealthCheckUrl += "/$HealthCheckPath"
      }
    }

    Add-WebConfigurationProperty -pspath $PSPath  -filter "webFarms" -name "." -value @{name=$Name}
    Set-WebConfigurationProperty -pspath $PSPath  -filter "webFarms/webFarm[@name='$Name']/applicationRequestRouting/healthCheck" -name "url" -value $HealthCheckUrl
    Set-WebConfigurationProperty -pspath $PSPath  -filter "webFarms/webFarm[@name='$Name']/applicationRequestRouting/healthCheck" -name "interval" -value $HealthCheckInterval
    Set-WebConfigurationProperty -pspath $PSPath  -filter "webFarms/webFarm[@name='$Name']/applicationRequestRouting/healthCheck" -name "timeout" -value $HealthCheckTimeout
    Set-WebConfigurationProperty -pspath $PSPath  -filter "webFarms/webFarm[@name='$Name']/applicationRequestRouting/healthCheck" -name "statusCodeMatch" -value $HealthCheckStatus
    Set-WebConfigurationProperty -pspath $PSPath  -filter "webFarms/webFarm[@name='$Name']/applicationRequestRouting/loadBalancing" -name "algorithm" -value "WeightedRoundRobin"

    foreach($server in $Servers)
    {
      Add-WebConfigurationProperty -pspath $PSPath  -filter "webFarms/webFarm[@name='$Name']" -name "." -value @{address=$server}
    }

    $arrRewriteRuleName = "ARR_{0}_loadBalance" -f $Name
      if ($RootPath) {
        $ruleMatch = "{0}/*" -f $RootPath
      } else {
        $ruleMatch = '*'
      }

    if ($IncludeNonSSL) {
      # Add the Non SSL Rewrite Rule
      
      Add-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules" -name "." -value @{name=$arrRewriteRuleName;patternSyntax='Wildcard';stopProcessing='True'}
      Set-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/match" -name "url" -value $ruleMatch
      Add-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/conditions" -name "." -value @{input='{HTTP_HOST}';matchType='Pattern';pattern=$HostName}
      Set-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/action" -name "type" -value "Rewrite"
      Set-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/action" -name "url" -value "http://$Name/{R:0}"
    }

    # Add the SSL Rewrite rule
    $arrRewriteRuleName += "_SSL"
    Add-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules" -name "." -value @{name=$arrRewriteRuleName;stopProcessing='True'}
    Set-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/match" -name "url" -value $ruleMatch

    Add-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/conditions" -name "." -value @{input='{HTTPS}';pattern='on'}
    Add-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/conditions" -name "." -value @{input='{HTTP_HOST}';matchType='Pattern';pattern=$HostName}
    Set-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/action" -name "type" -value "Rewrite"
    Set-WebConfigurationProperty -pspath $PSPath  -filter "system.webServer/rewrite/globalRules/rule[@name='$arrRewriteRuleName']/action" -name "url" -value "https://$Name/{R:0}"
}