---
title: "Coriolis User Scripts"
wp_id: 38725
---

# Coriolis User Scripts

**User Scripts** allow users to hook into Coriolis’ OS Morphing process and execute any needed last-minute customizations for the instance(s) being Migrated before being booted up on the destination cloud platform.

The feature is available in the following scenarios:

  * Creating a Replica Deployment from a current Replica

![](_static/images/123.jpg)

  * Creating a Migration
    * User Scrips will be one of the steps prior to starting a Migration task
    * The step is available after target configurations

![](_static/images/321.jpg)

In both cases, you can choose to have one generic, global script per operating system type (Linux, Windows, etc.) or a custom script for a specific instance.

Supported User Scripts file formats:

  * for Linux VMs, any scripting language available on a standard Linux (bash, python, etc.)
  * for Windows VMs, PowerShell and batch scripts are supported.

User Scripts can be leveraged in the following sample scenarios:

  * Install/Remove packages on the instance, that take place on the destination platform (not on the source VM) prior to the Migration process
  * Make additional configuration changes
  * Download files on the instance
  * Install 3rd party drivers

User scripts will run with elevated privileges, so they will have the same access rights as Coriolis itself.

Example of a PowerShell User Script for a Windows VM, this lists all 3rd party drivers from the migrated OS disk of the instance:

```powershell
$OS=$args[0]
dism.exe /Image:$OS /Get-Drivers 
```

This is a Linux User Script snippet that will download a file to the /var folder on the migrated instance disk:

```bash
#!/bin/bash
#$1 represents the root disk path
root_disk="$1"
wget https://url -O "$root_disk/var" 
```