Configure Azure Devops Agents in bulk

ConfigureAzureDevopsAgents.ps1

param(
    [Parameter(Mandatory=$true)] [string] $AzDoTenant,
    [Parameter(Mandatory=$true)] [string] $AzDoPAT,
    [Parameter(Mandatory=$true)] [string] $AgentPool,
    [Parameter(Mandatory=$true)] [string] $WorkDirectory,
    [Parameter(Mandatory=$true)] [int] $AgentCount,
    [Parameter(Mandatory=$false)] [string] $AgentPrefix = "Agent_"
)

$InformationPreference = "Continue"
$WarningPreference = "Continue"
$ErrorPreference = "Stop"


$agentDownloadURL = "https://vstsagentpackage.azureedge.net/agent/2.154.3/vsts-agent-win-x64-2.154.3.zip"
$rootFolder = Get-Location
$agentZip = Join-Path $rootFolder "agent.zip"
$agentTemplate = Join-Path $rootFolder "agent_template"



# Download Agent
if(Test-Path $agentZip) { 
    Remove-Item $agentZip -Force 
}
Write-Information "Downloading Agent from `"$agentDownloadURL`""
$ProgressPreference = "SilentlyContinue"
Invoke-WebRequest $agentDownloadURL -OutFile $agentZip

# Ensure AgentTemplate directory
if(Test-Path $agentTemplate) { 
    Remove-Item $agentTemplate -Recurse -Force 
}
New-Item $agentTemplate -ItemType Directory | Out-Null

# Extract Agent
Write-Information "Extracting Agent to `"$agentTemplate`""
Add-Type -AssemblyName System.IO.Compression.FileSystem
[System.IO.Compression.ZipFile]::ExtractToDirectory($agentZip, $agentTemplate)

# Create individual Agents
for($i=0; $i -lt $AgentCount; $i++) {
    $cAgentName = "$($AgentPrefix)$($i)"
    $cAgentPath = Join-Path $rootFolder $cAgentName
    Write-Information "Setting up `"$cAgentName`""

    if(Test-Path $cAgentPath) { 
        Remove-Item $cAgentPath -Recurse -Force 
    }
    Copy-Item -Path $agentTemplate -Destination $cAgentPath -Recurse

    $cWorkDir = Join-Path $WorkDirectory $cAgentName
    
    $command = "$($cAgentPath)\config.cmd"
    $command += " --unattended"
    $command += " --url https://dev.azure.com/$AzDoTenant"
    $command += " --auth pat"
    $command += " --token $AzDoPAT"
    $command += " --pool `"$AgentPool`""
    $command += " --agent `"$cAgentName`""
    $command += " --replace"
    $command += " --runAsService"
    $command += " --windowsLogonAccount `"NT AUTHORITY\NETWORK SERVICE`""
    $command += " --work `"$cWorkDir`""
    
    Invoke-Expression $command
}

Remove-Item $agentZip -Force -Recurse
Remove-Item $agentTemplate -Force -Recurse