Windows docker images creation goodies

Docker for Windows Server Cheatsheet

Below are some commands that migth be usefull for docker image creator:

Don’t forget that windows multiline commands can be separated by \ symbol in dockerfile and ^ in powershell/cmd file.

Decription	Command Syntax
Download file	Invoke-WebRequest -OutFile
Unzip file	Expand-Archive -DestinationPath
Run command	Start-Process -ArgumentList 'arg1', 'arg2';
Sleep	Start-Sleep -s 5
Print to console	Write-Host “It’s like echo on Linux”
Get environment variable SOMETHING	(Get-Item Env:SOMETHING).Value
Fail & exit with errorcode	exit($ERRORCODE)
Check if env. variable is not empty	if (-Not (Get-Item Env:SOMETHING)) { }
Add registry key	New-Item -Path -Name MSMQ –Force
Update registry entry	Set-ItemProperty -Path -Name -Value -Force
Remove registry entry	Remove-Item -Path
Install service / feature (windows server)	Install-WindowsFeature -ConfigurationFilePath c:\temp\appInit.xml
Stop / Start service	Stop-Service / Start-Service -Name WMSVC
Start process	& “C:/Windows/System32/iisreset” /restart

Here are some usefull code snippets:

Clean code

Remember that you can create functions in powershell and keep code clean:

#functions definitions
function initDbWithBasicValues {
  ...
}

function copyFilledDb {
  ...
}

#functions call place
initDbWithBasicValues
copyFilledDb

Wait for server restart

function waitForServerStart {
$sw = [Diagnostics.Stopwatch]::StartNew()
	while ($True){
		Write-Host "waiting for server to start"
		try {
			$status = (Invoke-WebRequest -Uri http://localhost:80 -UseBasicParsing -TimeoutSec 30).StatusCode.equals(200)
			if ($status) {break};

			Start-Sleep -s 5

		} catch {}
	}
$sw.Stop()

	Write-Host "Server is started !"
	Write-Host "Time-taken:" $sw.Elapsed
}

Grant permission to some folder

$Account = New-Object System.Security.Principal.NTAccount("IIS APPPOOL\.NET v4.5");
	$ItemList = Get-ChildItem -Path <SomePath> -Recurse;
	$ACL = Get-ACL <SomePath>;
	foreach ($Item in $ItemList) {
		$ACL.SetOwner($Account);
		Set-Acl -Path $Item.FullName -AclObject $Acl;
	};

Replace File contents

$content = Get-Content -Encoding UTF8 -path somePath
$content = $content -Replace '#original', "#newvalue"
$content | Out-File -Encoding UTF8 newPath

Download Huge file (it will take forever otherwise)

# Unless we silence here Download progress it would pause every second for no reason
$ProgressPreference = "SilentlyContinue"
Invoke-WebRequest $url -OutFile <outfile>
# Return back output
$progressPreference = 'Continue'