Integrating docker release management in TFS with webtests

TFS express 2017 provides free and fully integrated environment for continious integration and release management for docker windows containers. Post below only focuses on release management for docker containers via TFS and webtests produced by Visual Studio Enterprise edition.

My current setup of TFS build produces following artifacts available for release management.

  • docker-stack.yml

This file presented below provides information about build version of container image and in imagetag and additional information for running environment

  • tests folder with 3 files
    • local.testsettings
      • This file provides information which server webtest have to be running against

    • webtest1.webtest
      • This file provides actual steps which is tested

  • runtest.ps1
    • This file which performs 2 functions: waits for swarm manager to bring latest version of image up and then run webtests tests on those.

Release pipeline itself contains of 3 steps for each environment. Screenshot below for staging environment.

chrome_2017-07-27_15-13-27

First step is pushing newly built image to staging docker swarm. This step is using built-in Docker command tasks in TFS and passing information about swarm location and registry connection via built in TFS properties along with docker-stack.yml file above.

chrome_2017-07-27_15-17-31

Second step is powershell script named runtest.ps1above. Variables  are passed to script to specify which server needs to be checked against as well current version of new build version of docker image

chrome_2017-07-27_15-20-09

Last step is publishing results of those tests

chrome_2017-07-27_15-21-52

Below is screenshot what failure in webtest looks like. Along with failure also attached webtestresult file which you can open in Visual Studio to inspect details of what has failed.

chrome_2017-07-27_15-25-25

Please note to enable test run you need to have mstest.exe installed on TFS agent as part of Visual Studio Enterprise 2017 installation. You can use Evaluation Version to install it. Test will fail otherwise with File extension specified .webtest is not a valid test extension.

Another thing to note is that there is currently a bug in TFS 2017 U2 which does not properly pull results form TRX file and hence additional logic was added to powershell script to put results in correct location to Publish Test Results tag can find results.

 

Comparing windows containers CPU perfomance vs alternatives

When presenting containers solution to wider audience question of perfomance invariably comes to place (the same sort of discussion everybody had 10 years ago during virtualization craze). I decided to do unscientific test of running Windows containers vs alternatives. Specifically windows containers are compared against running the same application on physical hardware, inside Hyper-V VM on the same hardware as well as windows containers in process and hypervisolation modes.

You can check results by yourself as image is posted at artisticcheese\iis on docker hub.

Code which is used for testing is designed to return PI number calculates to certain number which is very CPU intensive operation. In my specific run I was calculating to 8000s place with total of 100 requests in multithreaded client.

Client code is below, which is powershell code relying on runspaces via PSParallel module


#requires -Modules PSParallel
Measure-command {1..100 | Invoke-Parallel -ScriptBlock
{Invoke-WebRequest http://localhost/service.svc/pi/8000 -UseBasicParsing}}

Below are results of running this tests against 4 different environments

Test environment Hyper-V Hardware Process Isolation HyperV isolation
96.47 90.12 90.77 91.4
97.12 90.13 90.86 90.24
97.87 89.27 90.49 91.3

Conclusion may be surprising or may be not but running Windows containers introduce virtually no overhead from CPU point of view on application perfomance.

Replacing ServiceMonitor.exe with IIS error log events in windows IIS container

ServiceMonitor.exe is used as default ENTRYPOINT entry official Microsoft IIS build. It does not seem to be doing much except for checking if service W3SVC is running. There is multitude of issues with this EXE based on github (https://github.com/Microsoft/iis-docker/issues). Bearing in mind very limited functionality that this EXE provides I decided it to replace with something more useful.
Starting with IIS 8.5 it’s possible to output IIS logs not only to log files but also to ETW events. You can consume those inside eventlog name called Microsoft-Windows-IIS-Logging/Logs which shall be enabled to receive those events. Steps below will allow to provide output of all errors being logged on your webserver to docker logs instead of default ENTRYPOINT of IIS image which does not provide any valuable information.
I also decided to start my images now in servercore instead of IIS since latter only installs WindowsFeature Web-Server and creates ENTRYPOINT for ServiceMonitor.exe. Neither of which is really necessary anyway.
To accomplish this 2 things would need to be changed in base Microsoft image.

  1. Enable IIS to log to ETW (in addition or insted of file logging)
  2. Enable log called Microsoft-IIS-Logging/logs

Step number 1 is accomplished by executing following powershell

Import-module WebAdministration
$splat = @{
    pspath = "MACHINE/WEBROOT/APPHOST"
    filter = "system.applicationHost/sites/siteDefaults/logFile"
    name =  "logTargetW3C"
    value = "File,ETW"
}
Set-WebConfigurationProperty @splat

Step 2 is below

$IISOpsLog = Get-WinEvent -ListLog Microsoft-IIS-Logging/logs
$IISOpsLog.IsEnabled = "true"
$IISOpsLog.SaveChanges()

Both entries are made inside website_config.ps1 file in artifacts directory.

This setup will output ETW events to Microsoft-IIS-Logging/logs which will be repeatadly read in powershell script called entrypoint.ps1 below

$VerbosePreference = "ignore"
$sleep = 5
while ($true)
{
    $datediff = (New-TimeSpan -Seconds $sleep).TotalMilliseconds
    $filter = "*/System/TimeCreated[timediff(@SystemTime) <= $datediff] and *[EventData/Data[@Name='sc-status'] >'400']"
    Get-WinEvent -MaxEvents 10 -FilterXPath $filter -ProviderName "Microsoft-Windows-IIS-Logging" -ErrorAction SilentlyContinue | 
    Select-Object @{Name = "time"; e = {$_.Properties[2].value}}, @{Name = "VERB"; e = {$_.Properties[8].value}}, 
    @{Name = "ClientIP"; e = {$_.Properties[3].value}}, @{Name = "URI"; e = {$_.Properties[9].value}}, 
    @{Name = "Query"; e = {$_.Properties[10].value}}, @{Name = "Status"; e = {$_.Properties[11].value}}, 
    @{Name = "host"; e = {$_.Properties[21].value}} | Format-Table
    Start-Sleep $sleep
}

I restrict number of events returned by query at source based on time since last request as well as only for specific eventcodes which identifies Web Server errors (status codes > 400)

The last step is to put this script into ENTRYPOINT in DOCKERFILE

ENTRYPOINT powershell.exe C:\startup\entrypoint.ps1

Entire code base along with additional files is available on Github page (https://github.com/artisticcheese/IISadmin)
Image on dockerhub is (https://hub.docker.com/r/artisticcheese/iis-admin/)

You can test functionality below

docker run -it artisticcheese/iis-admin

Issue request to non-existent file to local container

invoke-webrequest http://172.30.163.51/asda

You will see output in stdout of container

time     VERB ClientIP     URI   Query Status host         
----     ---- --------     ---   ----- ------ ----         
18:28:08 GET  172.30.160.1 /asda -        404 172.30.163.51

Using pure powershell to generate TLS certificates for Docker daemon running on Windows

Steps below will allow you to create necessary PKI infrastructure to secure you docker daemons with no requirement to download any external tools. Snippets below are not part of complete script but tidbits which you can use to procure both CA, server certificate as well as client certificate and reuse pieces for issuing additional certificates down the road.

Docker daemon requires 3 files on server to for secure TLS connection:

  • tlscacert which is Base64 encoded public key of CA certificate
  • tlscert which is Base64 encoded public key of server certificate
  • tlskey which Base64 encoded private key of server certificate

Docker daemon will list those keys in file called daemon.json under  $env:programdata\docker\config

Example of that file is below

{
"group": "Network Service",
"graph": "E:\\images",
"tlscacert": "C:\\ProgramData\\docker\\certs.d\\rootCA.cer",
"tlskey": "C:\\ProgramData\\docker\\certs.d\\privateKey.cer",
"hosts": [
"tcp://0.0.0.0:2376",
"npipe://"
],
"tlscert": "C:\\ProgramData\\docker\\certs.d\\serverCert.cer",
"tlsverify": true
}

Similar files will be required on client to connect to server, difference is certificate which will be used to connect which will have different EKU (Enhanced Key Usage) specified

  • tlscacert which is Base64 encoded public key of CA certificate
  • tlscert which is Base64 encoded public key of client certificate
  • tlskey which is Base64 encoded private key of client certificate
Docker client will use syntax below to connect to TLS secured docker endpoint
& docker --tlsverify --tlscacert=c:\test\rootca.cer --tlscert=c:\test\clientPublicKey.cer --tlskey=c:\test\clientPrivateKey.cer -H=tcp://containerhost1:2376 version

Creating CA certificate

Snippet below creates CA certificate and exports it’s public key to c:\test\rootCA.cer. Private key stays in your Windows Certificate Store and is exportable for your backup purpouses and reissuing new server and client certificates later. The only changeable parameter which you can modify for your environment is Subject.

        $splat = @{
        type = "Custom" ;
        KeyExportPolicy = "Exportable";
        Subject = "CN=Docker TLS Root";
        CertStoreLocation = "Cert:\CurrentUser\My";
        HashAlgorithm = "sha256";
        KeyLength = 4096;
        KeyUsage = @("CertSign", "CRLSign");
        TextExtension = @("2.5.29.19 ={critical} {text}ca=1")
    }
    $rootCert = New-SelfSignedCertificate @splat

After CA certificate is generated we need to export it’s public key to a file, the only changeable part here is Path

 $splat = @{
Path = "c:\test\rootCA.cer";
        Value = "-----BEGIN CERTIFICATE-----`n" + [System.Convert]::ToBase64String($rootCert.RawData, [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END CERTIFICATE-----";
        Encoding = "ASCII";
    }
    Set-Content @splat

Creating Server Certificate to secure TLS on container host

Code similar to generation of CA certificate with few notable changes, that is we provide which certificate is used to sign it as well as type of certificate, we export key after cert is generated. Changeable parameters are DNSName and Path

    $splat = @{
        CertStoreLocation = "Cert:\CurrentUser\My";
        DnsName = "swarmmanager1", "localhost", "containerhost1";
        Signer = $rootCert ;
        KeyExportPolicy = "Exportable";
        Provider = "Microsoft Enhanced Cryptographic Provider v1.0";
        Type = "SSLServerAuthentication";
        HashAlgorithm = "sha256";
        TextExtension = @("2.5.29.37= {text}1.3.6.1.5.5.7.3.1");
        KeyLength = 4096;
    }
    $serverCert = New-SelfSignedCertificate @splat
    $splat = @{
       Path = "c:\test\serverCert.cer";
       Value = "-----BEGIN CERTIFICATE-----`n" + [System.Convert]::ToBase64String($serverCert.RawData, [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END CERTIFICATE-----";
       Encoding = "Ascii"
}
   Set-Content @splat

Exporting private key for server certificate to a file

Last step for TLS connectivity for docker host to export private key to Base64 encoded file which has been pretty difficult with off the shelf powershell/.NET framework untill version 4.6 which provided method to export that key. Implementation is below

    $privateKeyFromCert = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPrivateKey($serverCert)
    $splat = @{
        Path = "c:\test\privateKey.cer";
        Value = ("-----BEGIN RSA PRIVATE KEY-----`n" + [System.Convert]::ToBase64String($privateKeyFromCert.Key.Export([System.Security.Cryptography.CngKeyBlobFormat]::Pkcs8PrivateBlob), [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END RSA PRIVATE KEY-----");
        Encoding = "Ascii";
    }
    Set-Content @splat

Creating client certificate

Code below performs similar tasks in relevant to client certificate like server certificate tasks above

    $splat = @{
        CertStoreLocation = "Cert:\CurrentUser\My";
        Subject = "CN=clientCert";
        Signer = $rootCert ;
        KeyExportPolicy = "Exportable";
        Provider = "Microsoft Enhanced Cryptographic Provider v1.0";
        TextExtension = @("2.5.29.37= {text}1.3.6.1.5.5.7.3.2") ;
        HashAlgorithm = "sha256";
        KeyLength = 4096;
    }
    $clientCert = New-SelfSignedCertificate  @splat
    $splat = @{
        Path = "c:\test\clientPublicKey.cer" ;
        Value = ("-----BEGIN CERTIFICATE-----`n" + [System.Convert]::ToBase64String($clientCert.RawData, [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END CERTIFICATE-----");
        Encoding = "Ascii";
    }
    Set-Content  @splat
    $clientprivateKeyFromCert = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPrivateKey($clientCert)
    $splat = @{
        Path = "c:\test\clientPrivateKey.cer";
        Value = ("-----BEGIN RSA PRIVATE KEY-----`n" + [System.Convert]::ToBase64String($clientprivateKeyFromCert.Key.Export([System.Security.Cryptography.CngKeyBlobFormat]::Pkcs8PrivateBlob), [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END RSA PRIVATE KEY-----");
        Encoding = "Ascii";
    }
    Set-Content  @splat

If everything worked correctly you are supposed to see 3 certificates on your machine listed below, which are CA certificate, server certificate and client certificate, you also shall have private key for each of those (indicated by key image).

mmc_2017-06-10_16-10-12

You shall also have 5 files created in c:\test folder like below

&amp;amp;amp;amp;amp;amp;nbsp;Directory: C:\test

Mode                LastWriteTime         Length Name
----                -------------         ------ ----
-a----        6/10/2017   4:09 PM           3314 clientPrivateKey.cer
-a----        6/10/2017   4:09 PM           1858 clientPublicKey.cer
-a----        6/10/2017   4:09 PM           3310 privateKey.cer
-a----        6/10/2017   4:09 PM           1812 rootCA.cer
-a----        6/10/2017   4:09 PM           1936 serverCert.cer

Add your CA root certificate to your trusted root certificate authorities in certmgr.msc. Make sure you copy and paste and not move CA root certificate since if you move you will not be able to sign any more keys. This is not not a requirement but will allow you to use native Windows tools in working with certificates instead of relying on file based store like openSSL does. For example you will be able to use HTTPS to call docker REST API both in browser and via Invoke-WebRequest

Deploy server certificate to docker container host

  • Open file named daemon.json under  $env:programdata\docker\config and paste lines in snippet below into it.
    "tlscacert":  "C:\\ProgramData\\docker\\certs.d\\rootCA.cer",
    "tlskey":  "C:\\ProgramData\\docker\\certs.d\\privateKey.cer",
    "hosts":  [
                  "tcp://0.0.0.0:2376",
                  "npipe://"
              ],
    "tlscert":  "C:\\ProgramData\\docker\\certs.d\\serverCert.cer",
    "tlsverify":  true
  • Copy files rootCA.cer, privateKey.cer, serverCert.cer to $env:programdata\docker\certs.d
  • Restart docker service Restart-Service docker

At this point you shall not be able to connect to daemon via HTTPS without providing a valid certificate. Try following  Invoke-WebRequest https://containerhost1:2376, it shall fail complaining that SSL client certificate is required for connection

The request was aborted: Could not create SSL/TLS secure channel.
At line:1 char:1
+ Invoke-WebRequest https://containerhost1:2376
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebException
+ FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

Attach client certificate to request by first finding thumbprint of your client cert in certificates manager and then use tab completion to iterate to it in get-item cert:\CurrentUser\My\, assign it to variable which you will attach to REST request $cert = get-item Cert:\CurrentUser\My\350A62B64152D9B85673E902A1F1C2CB6766598E

Issue the same request as above and it will succeed returning information about available images on remote system

PS >(Invoke-WebRequest https://containerhost1:2376/images/json -Certificate $cert -UseBasicParsing).Content | convertfrom-json

Containers : -1
Created : 1494389426
Id : sha256:242b8694ed621610a27746e0075c95e87f1a239e1800a4ea55e753010a49d9d5
Labels :
ParentId :
RepoDigests : {stefanscherer/dockertls-windows@sha256:5fe358a57cb31f18d2d148b0481898d530a5547c4d5d6f9ce5e0334ed8d3de19}
RepoTags : {stefanscherer/dockertls-windows:latest}
SharedSize : -1
Size : 1049291645
VirtualSize : 1049291645

One last thing is to try to use docker CLI to query the same information.

PS C:\admin> docker --tlsverify --tlscacert=c:\test\rootca.cer --tlscert=c:\test\clientPublicKey.cer --tlskey=c:\test\clientPrivateKey.c
er -H=tcp://containerhost1:2376 images

time="2017-06-10T16:46:14-05:00" level=info msg="Unable to use system certificate pool: crypto/x509: system root pool is not available on Windows"
REPOSITORY                        TAG                 IMAGE ID            CREATED             SIZE
stefanscherer/dockertls-windows   latest              242b8694ed62        4 weeks ago         1.05 GB

Full script is below

$ErrorActionPreference = "Stop"
if ([int](Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"  -Name Release).Release -lt 393295) {
    throw "Your version of .NET framework is not supported for this script, needs at least 4.6+"
}
function GenerateCerts {
    $splat = @{
        type = "Custom" ;
        KeyExportPolicy = "Exportable";
        Subject = "CN=Docker TLS Root";
        CertStoreLocation = "Cert:\CurrentUser\My";
        HashAlgorithm = "sha256";
        KeyLength = 4096;
        KeyUsage = @("CertSign", "CRLSign");
        TextExtension = @("2.5.29.19 ={critical} {text}ca=1")
    }
    $rootCert = New-SelfSignedCertificate @splat
    $splat = @{
        Path = "c:\test\rootCA.cer";
        Value = "-----BEGIN CERTIFICATE-----`n" + [System.Convert]::ToBase64String($rootCert.RawData, [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END CERTIFICATE-----";
        Encoding = "ASCII";
    }
    Set-Content @splat
    $splat = @{
        CertStoreLocation = "Cert:\CurrentUser\My";
        DnsName = "swarmmanager1", "localhost", "containerhost1";
        Signer = $rootCert ;
        KeyExportPolicy = "Exportable";
        Provider = "Microsoft Enhanced Cryptographic Provider v1.0";
        Type = "SSLServerAuthentication";
        HashAlgorithm = "sha256";
        TextExtension = @("2.5.29.37= {text}1.3.6.1.5.5.7.3.1");
        KeyLength = 4096;
    }
    $serverCert = New-SelfSignedCertificate @splat
    $splat = @{
        Path = "c:\test\serverCert.cer";
        Value = "-----BEGIN CERTIFICATE-----`n" + [System.Convert]::ToBase64String($serverCert.RawData, [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END CERTIFICATE-----";
        Encoding = "Ascii"
    }
    Set-Content @splat

    $privateKeyFromCert = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPrivateKey($serverCert)
    $splat = @{
        Path = "c:\test\privateKey.cer";
        Value = ("-----BEGIN RSA PRIVATE KEY-----`n" + [System.Convert]::ToBase64String($privateKeyFromCert.Key.Export([System.Security.Cryptography.CngKeyBlobFormat]::Pkcs8PrivateBlob), [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END RSA PRIVATE KEY-----");
        Encoding = "Ascii";
    }
    Set-Content @splat

    $splat = @{
        CertStoreLocation = "Cert:\CurrentUser\My";
        Subject = "CN=clientCert";
        Signer = $rootCert ;
        KeyExportPolicy = "Exportable";
        Provider = "Microsoft Enhanced Cryptographic Provider v1.0";
        TextExtension = @("2.5.29.37= {text}1.3.6.1.5.5.7.3.2") ;
        HashAlgorithm = "sha256";
        KeyLength = 4096;
    }
    $clientCert = New-SelfSignedCertificate  @splat
    $splat = @{
        Path = "c:\test\clientPublicKey.cer" ;
        Value = ("-----BEGIN CERTIFICATE-----`n" + [System.Convert]::ToBase64String($clientCert.RawData, [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END CERTIFICATE-----");
        Encoding = "Ascii";
    }
    Set-Content  @splat
    $clientprivateKeyFromCert = [System.Security.Cryptography.X509Certificates.RSACertificateExtensions]::GetRSAPrivateKey($clientCert)
    $splat = @{
        Path = "c:\test\clientPrivateKey.cer";
        Value = ("-----BEGIN RSA PRIVATE KEY-----`n" + [System.Convert]::ToBase64String($clientprivateKeyFromCert.Key.Export([System.Security.Cryptography.CngKeyBlobFormat]::Pkcs8PrivateBlob), [System.Base64FormattingOptions]::InsertLineBreaks) + "`n-----END RSA PRIVATE KEY-----");
        Encoding = "Ascii";
    }
    Set-Content  @splat
}
GenerateCerts

& docker --tlsverify --tlscacert=c:\test\rootca.cer --tlscert=c:\test\clientPublicKey.cer --tlskey=c:\test\clientPrivateKey.cer -H=tcp://containerhost1:2376 images

How to download individual files from GitHub enterprise

Hello,

Below instructions how to download individual files from private GitHub repository using powershell.

Assumptions:

  1. Your GitHub repository is hosted at github.mycompany.com
  2. Your organisation name is my-org
  3. Your repository name is my-repo
  4. Path to file you are trying to download is /myfiles/file.txt

Steps

  1. Obtain personal access token for you account by navigating to your account and choosing settings.
  2. Go to Personal Access Token setting and choose “Generate New Token”. Copy the resulting token key.
  3. Construct URL to the file you are trying to download in following format: http://github.mycompany.com/api/v3/repos/my-org/my-repo/contents/myfiles/file.txt
  4. Powershell script to download file is below. Values in italic are variables which will be different in your environment

Invoke-WebRequest http://github.mycompany.com/api/v3/repos/my-org/my-repo/contents/myfiles/file.txt -Headers @{“Authorization”=”token 8d795936d2c1b2806587719b9b6456bd16549ad8“;”Accept”= “application/vnd.github.v3.raw”}

If you need to download entire contents of your master branch then request will look like below

Invoke-WebRequest http://github.mycompany.com/api/v3/repos/my-org/my-repo/zipball/master -Headers @{“Authorization”=”token 8d795936d2c1b2806587719b9b6456bd16549ad8“} -OutFile out.zip

IIS WebDav hosting using IIS Manager Users to authentication

Enabling IIS WebDav functionality by using IIS Manager Users

Setting up IIS WebDav functionality is pretty trivial if one to rely on Windows user accounts for authentication but this architecture causing massive issues, namely:

  1. Accounts have to be precreated in Windows and are in fact real Windows accounts with permissions through system. I frequently see people while troubleshooting WebDav authentication issues adding those users to various group (in addition to default Users group) including Administrators account. 
  2. It’s difficult to maintain since those users accounts are specific to machine where they live and hence not trivial to extend setup to several servers without keeping all accounts in sync.
Instead we can rely on IIS Manager to store and maintain users which was designed to allow hosting providers to provide remote IIS management functionality to customers. This setup remove all the drawbacks of using Windows users as authentication provider. It’s easily scalable (since IIS shared configuration can be used) and do not provide any sort of access to underlying operating system.
Solution consists of 2 DSC scripts below. Instead of using UI to set this up DSC was chosen since it’s easily replicated at scale and provide reproducible and consistent behavior.
Prerequisites.ps1 which performs following:

  1. Install basic IIS features
  2. Enabled remote management to enable IIS Manager User features
  3. Install Nuget and chocolatey providers to pull required DSC resources to create website and manipulate NTFS permissions

Startup.ps1 which performs following:

  1. Enables WebDav and neccessary features
  2. Configured IIS Manager to accept both Windows and IIS Manager credentials
  3. Modifies permissions to allow IIS_IUSRS users to read configuration file
  4. Creates website and bindings it to default ports
  5. Create IIS manager users with the password
  6. Modifies IIS configuration to allow WebDav publishing based off IIS Manager credentials provider
  7. Assigns WebDav permissions to newly created users to access website

Prerequisites.ps1
https://gist.github.com/artisticcheese/d5bae27a14e5abe1d1eb57e36b558a5e.jsStartup.ps1 https://gist.github.com/artisticcheese/f03fe8d850d7abc61da2b714fad42968.js