function Join-AlkamiServiceFabricCluster {
<#
.SYNOPSIS
    Adds the executing server into an existing ServiceFabric cluster. Returns $true on success.

.PARAMETER servers
    The server hostname(s) of an existing cluster. Only one is required.
#>
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    Param(
        [Parameter(Mandatory = $true)]
        [string[]]$Servers
    )

    $loglead = (Get-LogLeadName);

    # Make sure we're not installing this on a web server.
    if(Test-IsWebServer) {
        Write-Error "$loglead : Cannot install Service Fabric on a Web server!";
        return $false;
    }

    if(($null -eq $servers) -or ($servers.count -eq 0))
    {
        Write-Error "$loglead No SF cluster servers passed in to join. Exiting.";
        return;
    }

    $endpointPort = 19000;

    Write-Host "$loglead : Scanning for an existing Service Fabric cluster to join.";
    $localIP = (Get-IpAddress);
    $existingClusterNodeIp = $null;
    foreach($server in $servers) {
        if($server -eq $localIP) {
            continue;
        }

        Write-Host "$loglead : Testing endpoint $($server):$endpointPort for a Service Fabric cluster.";
        $testEndpoint = (Test-NetConnection -ComputerName $server -Port $endpointPort);

        if($testEndpoint.TcpTestSucceeded) {
            $existingClusterNodeIp = $server;
            break;
        }
    }

    if($null -eq $existingClusterNodeIp) {
        Write-Host "$loglead : Could not find a running service fabric cluster to join server to.";
        return $false;
    }

    # Connect to an existing cluster if one exists.
    Write-Host "$loglead : Downloading Service Fabric installer/runtime files via Chocolatey."
    choco upgrade Alkami.DevOps.ServiceFabric -yr;

    $chocoInstallPath = Get-ChocolateyInstallPath
    $fabricBasePath = Join-Path $chocoInstallPath "lib\Alkami.DevOps.ServiceFabric\files"
    if(!(Test-Path $fabricBasePath)) {
        Write-Error "$loglead : Service Fabric was not downloaded correctly. Check the Chocolatey logs.";
        return $false;
    }

    # Make sure that the offline installation .cab was downloaded successfully.
    $runtime = Get-ChildItem -Path $fabricBasePath -Filter "*.cab" | select-object -First 1;
    if(($null -eq $runtime) -or (!(Test-Path $runtime.FullName))) {
        Write-Error "$loglead : The Service Fabric offline installation .cab was not downloaded correctly. Check the chocolatey logs.";
        return $false;
    }
    $runtimePath = $runtime.FullName;

    # Determine the name of the SF node and its fqdn for windows authentication.
    $nodeName = $env:COMPUTERNAME;
    $fqdn = (Get-FullyQualifiedServerName);

    # Determine endpoint of the existing cluster endpoint we're joining.
    $endpoint = "{0}:$endpointPort" -f $existingClusterNodeIp;

    # Determine fault/upgrade domain.
    $faultDomain = $null;
    $hashcode = [Math]::Abs($fqdn.GetHashCode());

    # Use the hostname as the AZ to get around overtly strict rules around microservice placements in SF
    $az = $env:COMPUTERNAME;

    # Set the fault domain to the availability zone in AWS.
    $faultDomain = "fd:/{0}/r0" -f $az;
    $upgradeDomain = $hashcode;

    $environmentName = (Get-AppSetting -appSettingKey "Environment.Name");
    $workerName = (Format-AlkamiEnvironmentWorkerNodeType $environmentName);

    # TODO: Fix this to remove a manual setup step.
        # The issue is that this relies on SF module functions to work.
        # However, the SF module is installed with the AddNode.ps1 script below.
    # New-AlkamiServiceFabricEnvironmentNodeType -environmentName $environmentName;

    # Look up the server certificate name from the seed node.
    $clusterManifestLocation = "C:\ProgramData\SF\clusterManifest.xml";
    $clusterManifestLocation = Get-UncPath -filePath $clusterManifestLocation -ComputerName ($Servers[0]);
    if(!(Test-Path $clusterManifestLocation)) {
        Write-Error "$loglead : Could not find Cluster Manifest config file at '$clusterManifestLocation'.";
        return;
    }

    # Read the certificate common name to connect to the cluster with.
    $ServerCertificateCommonName = $null;
    $namespace = @{ x = "http://schemas.microsoft.com/2011/01/fabric" };
    $serverCertNode = (Select-Xml -Path $clusterManifestLocation -XPath "//x:ServerCertificate" -Namespace $namespace) | Select-Object -ExpandProperty Node -First 1;
    if(!([string]::IsNullOrWhiteSpace($serverCertNode.X509FindValue))) {
        $ServerCertificateCommonName = $serverCertNode.X509FindValue;
    } else {
        Write-Error "$loglead Could not locate a certificate common name in the cluster manifest. Exiting.."
        return;
    }

    # Look up the certificate to connect to the cluster with.
    $serverCert = Find-CertificateByName -CommonName $ServerCertificateCommonName -StoreLocation "LocalMachine" -StoreName "My";
    if($null -eq $serverCert) {
        Write-Host "$loglead Could not locate certificate $ServerCertificateCommonName. Make sure it is loaded to the local machine store.";
    }
    $serverCertThumbprint = $serverCert.Thumbprint;

    Write-Host "$loglead : Connecting to existing Service Fabric cluster on node $existingClusterNodeIp";
    $installerPath = Join-Path $fabricBasePath "AddNode.ps1";
    & $installerPath -NodeName $nodeName -NodeType $workerName -NodeIPAddressorFQDN $fqdn -ExistingClientConnectionEndpoint $endpoint -UpgradeDomain $upgradeDomain -FaultDomain $faultDomain -FabricRuntimePackagePath $runtimePath -AcceptEULA -X509Credential -ServerCertThumbprint $serverCertThumbprint -StoreLocation "LocalMachine" -StoreName "My" -FindValueThumbprint $serverCertThumbprint -Verbose;

    # See if the SF port is listening as a test. The SF AddNode script doesn't actually fail.
    Start-Sleep -Seconds 5;
    if ($null -eq (Get-NetTCPConnection | Where-Object {($_.LocalPort -eq $endpointPort) -and ($_.State -eq "Listen")})) {
        Write-Error "$loglead : Server did not successfully join cluster. Read logs.";
        return $false;
    }

    return $true;
}