Rough script to quickly start cluster of local mongoDb instances, for experimenting with elections and sharding.

mongo_cluster.ps1

function Add-MongoToPath () {
    $mongoPath = "C:\Program Files\MongoDB\Server\3.2\bin"
    if ($env:Path -notlike "*$mongoPath*")
    {
        $env:path += ";$mongoPath"
    }
}

function Start-ServerInstace ([string]$ComputerName = "localhost", [int]$Port, [string]$ReplicationSet = "rs0", [string]$DatabasePath) {
    $process =  Start-Process Powershell.exe -PassThru -ArgumentList "-NoProfile", "-Command ""
            mongod --bind_ip $ComputerName --port $Port --dbpath $DatabasePath --replSet $ReplicationSet |
                foreach { `$host.ui.rawui.WindowTitle = ""'${ComputerName}:$Port -- ' + `$_""; ""`$_"" | Out-Default }
                "" "

    [PsCustomObject]@{
        ComputerName = $ComputerName
        Port=$Port
        Process = $process
    }
}

Add-MongoToPath

$script:instances = @()
 1..10 | foreach { 
    $port = 27000 + $_
    $dbPath = "C:\temp\data\db$_"
    New-Item -ItemType Directory -Force -Path $dbPath | Out-Null
    $script:instances += Start-ServerInstace -ComputerName localhost -Port $Port -DatabasePath $dbPath -ReplicationSet rs0
    Start-Sleep -Seconds 2
    if ($_ -eq 1)
    {
        mongo localhost:27001 -eval 'rs.initiate({_id:"rs0", members: [{"_id":1, "host":"localhost:27001"}]})'
    }
    else
    {
        mongo localhost:27001 -eval "rs.add('localhost:$port')"
    }
}

Start-Process  mongo -ArgumentList 'localhost:27001' -Wait

#do not use Stop-Process here it does not allow the db to perform it's cleanup
$script:instances | foreach { 
    if (-not $_.process.ExitTime) { 
        taskkill /pid $_.process.id 
    }
}