hosted services

Here's a snippet for adding custom scripts to an Azure Linux VM. I'm not personally too fond of these extensions as they're limited and can almost randomly repeat. Ensure you remove it using the -uninstall flag once you've got confirmation that the script finished cleanly.

$module_list = @( "azurerm", "azure" )

foreach( $module in $module_list ) {
    if( !( Get-InstalledModule -name $module ) ) {
        write-host "Installing $module"
        install-module -Name $module -Scope CurrentUser -Force -allowclobber
    }
    Import-Module $module
}

write-host "Finished module checks"

$subscription = "yoursubscription"
$machine      = "vmname"
$servicename  = "vmservice"

$cred = get-credential -username $user

Add-AzureAccount     -Credential $cred | out-null
Login-AzureRmAccount -credential $cred | out-null

Select-AzureSubscription -subscriptionname   $subscription -current -ErrorAction Stop | out-null

$public_configuration = @'
    {
        "fileUris" : [],
        "commandToExecute": "/sbin/usermod -p 'yourpasswordcrypt' root"
    }
'@

$vm = get-azurevm -name $machine -ServiceName $servicename
Set-AzureVMExtension -VM $vm -ExtensionName "CustomScriptForLinux" -Publisher "Microsoft.OSTCExtensions" -Version "1.*"  -PublicConfiguration $public_configuration

# don't forget to add the flag -uninstall once your work is finished as a vm can have
# only one CustomScriptForLinux extension

$vm | update-azurevm