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Amazon Elastic Compute Cloud
User Guide for Windows Instances

Configuring a Windows Instance Using EC2Launch

EC2Launch is a set of Windows PowerShell scripts that replaces the EC2Config service on Windows Server 2016 AMIs. EC2Launch performs the following tasks by default during the initial instance boot:

  • Sets up new wallpaper that renders information about the instance. (Doesn't apply to Nano Server.)

  • Sets the computer name.

  • Sends instance information to the Amazon EC2 console.

  • Sends the RDP certificate thumbprint to the EC2 console. (Doesn't apply to Nano Server.)

  • Sets a random password for the administrator account.

  • Adds DNS suffixes.

  • Dynamically extends the operating system partition to include any unpartitioned space.

  • Executes user data (if specified). For more information about specifying user data, see Configuring Instances with User Data.

The following tasks help to maintain backward compatibility with the EC2Config service. You can also configure EC2Launch to perform these tasks during startup:

  • Initialize secondary EBS volumes.

  • Send Windows Event logs to the EC2 console logs.

  • Send the Windows is ready to use message to the EC2 console.

For more information about Windows Server 2016, see What's New with Windows Server 2016 and Install Nano Server on Microsoft.com.

Verify the EC2Launch Version

Use the following Windows Powershell command to verify the installed version of EC2Launch.

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PS C:\> Import-Module -Name C:\ProgramData\Amazon\EC2-Windows\Launch\Module\Ec2Launch.psd1; (Get-Module EC2Launch).Version.ToString()

Installing the Latest Version of EC2Launch

Use the following procedure to download and install the latest version of EC2Launch on your instances.

To download and install the latest version of EC2Launch

  1. If you have already installed and configured EC2Launch on an instance, make a backup of the EC2Launch configuration file. The installation process does not preserve changes in this file. By default, the file is located in the C:\ProgramData\Amazon\EC2-Windows\Launch\Config directory.

  2. Download EC2-Windows-Launch.zip to a directory on the instance.

  3. Download install.ps1 to the same directory where you downloaded EC2-Windows-Launch.zip.

  4. Run install.ps1

  5. If you made a backup of the EC2Launch configuration file, copy it to the C:\ProgramData\Amazon\EC2-Windows\Launch\Config directory.

EC2Launch Directory Structure

EC2Launch is installed by default on Windows Server 2016 AMIs in the root directory C:\ProgramData\Amazon\EC2-Windows\Launch.

Note

By default, Windows hides files and folders under C:\ProgramData. To view EC2Launch directories and files, you must either type the path in Windows Explorer or change the folder properties to show hidden files and folders.

The Launch directory contains the following subdirectories.

  • Scripts — Contains the PowerShell scripts that make up EC2Launch.

  • Module — Contains the module for building scripts related to Amazon EC2.

  • Config — Contains script configuration files that you can customize.

  • Sysprep — Contains Sysprep resources.

  • Settings — Contains an application for the Sysprep graphical user interface.

  • Logs — Contains log files generated by scripts.

Configuring EC2Launch

After your instance has been initialized the first time, you can configure EC2Launch to run again and perform different start-up tasks.

Configure Initialization Tasks

Enable or disable the following tasks using the LaunchConfig.json configuration file:

  • Set the computer name.

  • Set up new wallpaper.

  • Add DNS suffix list.

  • Extend the boot volume size.

  • Specify the administrator password.

To configure initialization settings

  1. On the instance to configure, open the following file in a text editor: C:\ProgramData\Amazon\EC2-Windows\Launch\Config\LaunchConfig.json.

  2. Update the following settings as needed and save your changes. Provide a password in adminPassword only if adminPasswordtype is Specify.

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    { "setComputerName": false, "setWallpaper": true, "addDnsSuffixList": true, "extendBootVolumeSize": true, "adminPasswordType": "Random, Specify, DoNothing", "adminPassword": "Password that adheres to your security policy." }

    The password types are defined as follows:

    Random

    EC2Launch generates a password and encrypts it using the user's key. The system disables this setting after the instance is launched so that this password persists if the instance is rebooted or stopped and started.

    Specify

    Choose this option to specify a password in adminPassword. If the password does not meet the system requirements, a random password is generated instead. The password is stored in LaunchConfig.json as clear text and is deleted after Sysprep sets the administrator password. EC2Launch encrypts the password using the user's key.

    DoNothing

    Choose this option if you specified a password in the unattend.xml file. If you choose this option and don't specify a password in unattend.xml, the system uses the password of the parent AMI.

  3. In Windows PowerShell, run the following command so that the system schedules the script to run as a Windows Scheduled Task. The script runs one time during the next boot and then disables these tasks from running again.

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    C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\InitializeInstance.ps1 -Schedule

Initialize Drives and Drive Letter Mappings

Specify settings in the DriveLetterMappingConfig.json file to initialize and format drives and map drive letters to EBS volumes on your EC2 instance. The script performs this operation if the drives have not already been initialized and partitioned.

To map drive letters to volumes

  1. Open the C:\ProgramData\Amazon\EC2-Windows\Launch\Config\DriveLetterMappingConfig.json file in a text editor.

  2. Specify the following volume settings and save your changes:

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    { "driveLetterMapping": [ { "volumeName": "Temporary Storage 0", "driveLetter": "H" } ] }
  3. In Windows PowerShell, run the following command so that the system schedules the script to run as a Windows Scheduled Task.

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    C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\InitializeDisks.ps1

    By default, the script runs only when the instance first boots. To initialize disks each time the instance boots (an option that is backwards compatible with EC2Config), run the following command:

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    C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\InitializeDisks.ps1 -Schedule

You can also initialize attached disks at the instance launch by adding the following path to the PowerShell script in Amazon EC2 user data.

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<powershell> C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\InitializeDisks.ps1 </powershell>

Send Windows Event Logs to the EC2 Console

Specify settings in the EventLogConfig.json configuration file to send Windows Event logs to EC2 console logs.

To configure settings to send Windows Event logs

  1. On the instance, open the C:\ProgramData\Amazon\EC2-Windows\Launch\Config\EventLogConfig.json file in a text editor.

  2. Configure the following log settings and save your changes:

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    { "events": [ { "logName": "System", "source": "An event source (optional)", "level": "Error", "numEntries": 3 } ] }
  3. In Windows PowerShell, run the following command so that the system schedules the script to run as a Windows Scheduled Task each time the instance boots.

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    C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\SendEventLogs.ps1 -Schedule

    The logs can take three minutes or more to appear in the EC2 console logs.

Send Windows Is Ready Message After A Successful Boot

The EC2Config service sent the "Windows is ready" message to the EC2 console after every boot. EC2Launch sends this message only after the initial boot. For backwards compatibility with the EC2Config service, you can schedule EC2Launch to send this message after every boot. On the instance, open Windows PowerShell and run the following command. The system schedules the script to run as a Windows Scheduled Task.

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C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts\SendWindowsIsReady.ps1 -Schedule

Using Sysprep with EC2Launch

Sysprep simplifies the process of duplicating a customized installation of Windows Server 2016. Ec2Launch offers a default answer file and batch files for Sysprep that automate and secure the image-preparation process on your AMI. Modifying these files is optional. These files are located in the following directory, by default: C:\ProgramData\Amazon\EC2-Windows\Launch\Sysprep.

Important

Sysprep is not supported on Windows Server 2016 Nano Server. Also, don't use Sysprep to create an instance backup. Sysprep removes system-specific information. If you remove this information there might be unintended consequences for an instance backup.

The EC2Launch answer file and batch files for Sysprep include the following:

Unattend.xml

This is the default answer file. If you run SysprepInstance.ps1 or choose ShutdownWithSysprep in the user interface, the system reads the setting from this file.

BeforeSysprep.cmd

Customize this batch file to run commands before Ec2Launch runs Sysprep.

SysprepSpecialize.cmd

Customize this batch file to run commands during the Sysprep specialize phase.

Running Sysprep with EC2Launch

On the full installation of Windows Server 2016 (with a desktop experience), you can run Sysprep with EC2Launch manually or by using the EC2 Launch Settings application.

To run Sysprep using the EC2Launch Settings application

  1. In the Amazon EC2 console, locate or create a Windows Server 2016, Standard edition AMI.

  2. Launch a Windows instance from the AMI.

  3. Connect to your Windows instance and customize it.

  4. Search for and run the EC2LaunchSettings application. It is located in the following directory by default: C:\ProgramData\Amazon\EC2-Windows\Launch\Settings.

    
                            EC2 Launch Settings application
  5. Select or clear options as needed. These settings are stored in the LaunchConfig.json file.

  6. For Administrator Password, do one of the following:

    • Choose Random. EC2Launch generates a password and encrypts it using the user's key. The system disables this setting after the instance is launched so that this password persists if the instance is rebooted or stopped and started.

    • Choose Specify and type a password that meets the system requirements. The password is stored in LaunchConfig.json as clear text and is deleted after Sysprep sets the administrator password. If you shut down now, the password is set immediately. EC2Launch encrypts the password using the user's key.

    • If you specified a password in the unattend.xml file, choose DoNothing. If you choose this option and don't specify a password in unattend.xml, the system sets the password to match the password of the parent AMI.

    • If you plan to shut down the system without running sysprep, choose DoNothing.

  7. Choose Shutdown with Sysprep.

To manually run Sysprep using EC2Launch

  1. In the Amazon EC2 console locate or create a Windows Server 2016, Standard edition AMI that you want to duplicate.

  2. Launch and connect to your Windows instance.

  3. Customize the instance.

  4. Specify settings in the LaunchConfig.json file. This file is located in the C:\ProgramData\Amazon\EC2-Windows\Launch\Config directory by default.

    For adminPasswordType, specify one of the following values:

    Random

    EC2Launch generates a password and encrypts it using the user's key. The system disables this setting after the instance is launched so that this password persists if the instance is rebooted or stopped and started.

    Specify

    Choose this option to specify a password in adminPassword. If the password does not meet the system requirements, a random password is generated instead. The password is stored in LaunchConfig.json as clear text and is deleted after Sysprep sets the administrator password. EC2Launch encrypts the password using the user's key.

    DoNothing

    Choose this option if you specified a password in the unattend.xml file. If you choose this option and don't specify a password in unattend.xml, the system uses the password of the parent AMI.

  5. (Optional) Specify settings in unattend.xml and other configuration files. If plan to attend to the installation, then you don't need to make changes in these files. The files are located in the following directory by default: C:\ProgramData\Amazon\EC2-Windows\Launch\Sysprep.

  6. In Windows PowerShell, run ./InitializeInstance.ps1 -Schedule. The script is located in the following directory, by default: C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts. This script schedules the instance to initialize during the next boot. You must run this script before you run the SysprepInstance.ps1 script in the next step.

  7. In Windows PowerShell, run ./SysprepInstance.ps1. The script is located in the following directory by default: C:\ProgramData\Amazon\EC2-Windows\Launch\Scripts.

You are logged off the instance, and the instance shuts down. If you check the Instances page in the Amazon EC2 console, the instance state changes from running to stopping, and then finally to stopped. At this point, it's safe to create an AMI from this instance.