Amazon AppStream 2.0
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 AWS Documentation » Amazon AppStream 2.0 » Developer Guide » Fleets and Stacks » Customize an AppStream 2.0 Fleet to Optimize Your Users' Application Streaming Experience

# Customize an AppStream 2.0 Fleet to Optimize Your Users' Application Streaming Experience

By customizing AppStream 2.0 fleet instances, you can define specific aspects of your AppStream 2.0 environment to optimize your users' application streaming experience. For example, you can persist environment variables to dynamically pass settings across applications and set default file associations that are applied to all of your users. At a high level, customizing a fleet instance includes the following tasks:

• Connecting to an image builder and customizing it as needed.

• On the image builder, using Image Assistant to create a new image that includes your customizations.

• Creating a new fleet instance or modifying an existing one. When you configure the fleet instance, select the new customized image that you created.

• Creating a new stack or modifying an existing one and associating it with your fleet instance.

Note

For certain fleet customizations, in Active Directory environments, you might need to use the Group Policy Management Console (GPMC) to update Group Policy object (GPO) settings on a domain-joined computer.

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## Persist Environment Variables

Environment variables enable you to dynamically pass settings across applications. For example, many engineering applications rely on environment variables to specify the IP address or host name of a license server to locate and check out a license from that server.

Follow the steps in these procedures to make environment variables available across your fleet instances.

Contents

Note

If you are using Active Directory and Group Policy with AppStream 2.0, keep in mind that streaming instances must be joined to an Active Directory domain to use Group Policy for environment variables. For information about how to configure the Group Policy Environment Variable preference item, see Configure an Environment Variable Item in the Microsoft documentation.

### Change System Environment Variables

Follow these steps to change system environment variables across your fleet instances.

To change system environment variables on an image builder

This procedure applies only to system environment variables, not user environment variables. To change user environment variables that persist across your fleet instances, follow the steps in the next procedure.

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. In the left navigation pane, choose Images, Image Builder.

3. Choose the image builder on which to change system environment variables, verify that it is in the Running state, and choose Connect.

4. Log in to the image builder by doing either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, specify the credentials for a domain user account that has local administrator permissions on the image builder, then choose Log in.

5. Choose the Windows Start button, open the context (right-click) menu for Computer, and then choose Properties.

7. In System variables, change the environment variables that you want to persist across your fleet instances, and then choose OK.

8. On the image builder desktop, open Image Assistant.

9. Follow the necessary steps in Image Assistant to finish creating your image. For more information, see Tutorial: Create a Custom AppStream 2.0 Image.

The changes to the system environment variables persist across your fleet instances and are available to streaming sessions launched from those instances.

Note

Setting AWS CLI credentials as system environment variables might prevent AppStream 2.0 from creating the image.

### Change User Environment Variables

Follow these steps to change user environment variables across your fleet instances.

To change user environment variables

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. In the left navigation pane, choose Images, Image Builder.

3. Choose the image builder on which to change user environment variables, verify that it is in the Running state, and choose Connect.

4. On the Local User tab, choose Template User.

5. On the image builder, choose the Windows Start button, Control Panel, User Accounts.

6. Choose User Accounts again. In the left navigation pane, choose Change my environment variables.

7. Under User environment variables for DefaultProfileUser, set or create the user environment variables as needed, then choose OK.

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, and log in as a domain user who has local administrator permissions on the image builder.

9. On the image builder desktop, open Image Assistant.

10. Follow the necessary steps in Image Assistant to finish creating your image. For more information, see Tutorial: Create a Custom AppStream 2.0 Image.

### Create an Environment Variable That is Limited in Scope

Follow these steps to create an environment variable that is limited in scope to the processes that are spawned off the script. This approach is useful when you need to use the same environment variable name with different values for different applications. For example, if you have two different applications that use the environment variable "LIC_SERVER", but each application has a different value for "LIC_SERVER".

To create an environment variable that is limited in scope

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. In the left navigation pane, choose Images, Image Builder.

3. Choose the image builder on which to create an environment variable that is limited in scope, verify that it is in the Running state, and choose Connect.

4. Log in to the image builder by doing either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, specify the credentials for a domain user account that has local administrator permissions on the image builder, then choose Log in.

5. Create a child folder of C:\ drive for the script (for example, C:\Scripts).

6. Open Notepad to create the new script, and enter the following lines:

set variable=value

start " " "C:\path\to\application.exe"

Where:

variable is the variable name to be used

value is the value for the given variable name

Note

If the application path includes spaces, the entire string must be encapsulated within quotation marks. For example:

start " " "C:\Program Files\application.exe"

7. Choose File, Save. Name the file and save it with the .bat extension to C:\Scripts. For example, name the file LaunchApp.bat.

8. If needed, repeat steps 4 and 5 to create a script for each additional application that requires its own environment variable and values.

9. On the image builder desktop, start Image Assistant.

10. Choose Add App, navigate to C:\Scripts, and select one of the scripts that you created in step 5. Choose Open.

11. In the App Launch Settings dialog box, keep or change the settings as needed. When you're done, choose Save.

12. If you created multiple scripts, repeat steps 8 and 9 for each script.

13. Follow the necessary steps in Image Assistant to finish creating your image. For more information, see Tutorial: Create a Custom AppStream 2.0 Image.

The environment variable and specific value are now available for processes that are run from the script. Other processes cannot access this variable and value.

## Set Default File Associations for Your Users

The associations for application file extensions are set on a per-user basis and so are not automatically applied to all users who launch AppStream 2.0 streaming sessions. For example, if you set Adobe Reader as the default application for .pdf files on your image builder, this change is not applied to your users.

To set default file associations for your users

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. Choose the image builder on which to set default file associations, verify that it is in the Running state, and choose Connect.

3. Log in to the image builder by doing either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, specify the credentials for a domain user account that has local administrator permissions on the image builder, then choose Log in.

4. Set default file associations as needed.

5. Open the Windows command prompt as an administrator.

6. At the command prompt, type the following command to export the image builder file associations as an XML file, and then press ENTER:

dism.exe /online /export-DefaultAppAssociations:c:\default_associations.xml

If you receive an error message stating that you cannot service a running 64-bit operating system with a 32-bit version of DISM, close the command prompt window. Open File Explorer, browse to C:\Windows\System32, right-click cmd.exe, choose Run as Administrator, and run the command again.

7. Open Local Group Policy Editor by opening the command prompt as an administrator, typing gpedit.msc, and then pressing ENTER.

8. In the console tree, under Computer Configuration, expand Administrative Templates, Windows Components, and then choose File Explorer.

9. Double-click Set a default associations configuration file.

10. In the Set a default associations configuration file properties dialog box, choose Enabled, and enter this path: c:\default_associations.xml.

11. Choose Apply, OK.

12. Close Local Group Policy Editor.

13. On the image builder desktop, open Image Assistant.

14. Follow the necessary steps in Image Assistant to finish creating your image. For more information, see Tutorial: Create a Custom AppStream 2.0 Image.

The file associations that you configured are applied to the fleet instances and user streaming sessions that are launched from those instances.

## Set Google Chrome as the Default Browser for Users' Streaming Sessions

By default, new user accounts for Microsoft Windows have Internet Explorer set as the default browser. Follow these steps to set Google Chrome as the default browser for your fleet instances.

To set Google Chrome as the default browser for fleet instances

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. Choose the image builder on which to set Chrome as the default browser, verify that it is in the Running state, and choose Connect.

3. Log in to the image builder by doing either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, specify the credentials for a domain user account that has local administrator permissions on the image builder, then choose Log in.

4. On the image builder desktop, start Image Assistant.

5. Choose + Add App, navigate to the location where Chrome is installed (for example, C:\Program Files (x86)\Google\Chrome\Application\), and select chrome.exe.

6. In the App Launch Settings dialog box, in Launch Parameters, enter the following:

--make-default-browser-for-user --no-first-run

7. Choose Save.

8. Continue installing and configuring applications as needed.

Users who are connected to streaming sessions launched from those fleet instances have Google Chrome as the default browser for http:// and https:// connections. The users’ existing application preferences for opening files with .htm and .html extensions are not changed.

## Disable Internet Explorer Enhanced Security Configuration

Internet Explorer Enhanced Security Configuration (ESC) places servers and Internet Explorer in a configuration that limits exposure to the internet. However, this configuration can impact the AppStream 2.0 end user experience. Users who are connected to AppStream 2.0 streaming sessions may find that websites do not display or perform as expected when:

• Internet Explorer ESC is enabled on fleet instances from which users’ streaming sessions are launched

• Users run Internet Explorer during their streaming sessions

• Applications use Internet Explorer to load data

To disable Internet Explorer Enhanced Security Configuration

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. In the left navigation pane, choose Images, Image Builder.

3. Choose the image builder on which to disable Internet Explorer ESC, verify that it is in the Running state, and choose Connect.

4. Log in to the image builder by doing either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, specify the credentials for a domain user account that has local administrator permissions on the image builder, then choose Log in.

5. On the image builder, disable Internet Explorer ESC by doing the following:

1. Open Server Manager. Choose the Windows Start button, and then choose Server Manager.

2. In the left navigation pane, choose Local Server.

3. In the right properties pane, choose the On link next to IE Enhanced Security Configuration.

4. In the Internet Explorer Enhanced Configuration dialog box, choose the Off option under Administrators and Users, then choose OK.

6. In the upper right area of the image builder desktop, choose Admin Commands, Switch User.

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Template User.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, and log in as a domain user who does not have local administrator permissions on the image builder.

8. Open Internet Explorer and reset your settings by doing the following:

1. In the upper right area of the Internet Explorer browser window, choose the Tools icon, then choose Internet options.

2. Choose the Advanced tab, then choose Reset.

3. When prompted to confirm your choice, choose Reset again.

4. When the Reset Internet Explorer Settings message displays, choose Close.

9. Choose Admin Commands, Switch User, and then do either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, and log in with the same domain user account that you used in step 4.

10. On the image builder desktop, open Image Assistant.

11. Follow the necessary steps in Image Assistant to finish creating your image. For more information, see Tutorial: Create a Custom AppStream 2.0 Image.

## Change the Default Internet Explorer Home Page for Users' Streaming Sessions

You can use Group Policy to change the default Internet Explorer home page for users' streaming sessions. Alternatively, if you do not have Group Policy in your environment or prefer not to use Group Policy, you can use the AppStream 2.0 Template User account instead.

### Use Group Policy to Change the Default Internet Explorer Home Page

In Active Directory environments, you use the Group Policy Management (GPMC) MMC-snap-in to set a default home page that users can't change. If Active Directory is not in your environment, you can use Local Group Policy Editor to perform this task. To set a home page that users can change, you must use the GPMC.

To use the GPMC, do the following first:

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. If you are not using Active Directory in your environment, open Local Group Policy Editor. If you are using Active Directory, open the GPMC. Locate the Scripts (Logon\Logoff) policy setting:

• Local Group Policy Editor:

On your image builder, open the command prompt as an administrator, type gpedit.msc, and then press ENTER.

Under User Configuration, expand Administrative Templates, Windows Components, and then choose Internet Explorer.

• GPMC:

In your directory or on a domain controller, open the command prompt as an administrator, type gpmc.msc, and then press ENTER.

In the left console tree, select the OU in which you want to create a new GPO, or use an existing GPO, and then do either of the following: :

• Create a new GPO by opening the context (right-click) menu and choosing Create a GPO in this domain, Link it here. For Name, provide a descriptive name for this GPO.

• Select an existing GPO.

Open the context menu for the GPO, and choose Edit.

Under User Configuration, expand Policies, Administrative Templates, Windows Components, and then choose Internet Explorer.

4. Choose Apply, OK.

5. Close Local Group Policy Editor or the GPMC.

To change the default Internet Explorer home page by using Group Policy preferences

You can use Group Policy preferences to set a default home page that users can change. For more information about working with Group Policy preferences, see Configure a Registry Item and Group Policy Preferences Getting Started Guide in the Microsoft documentation.

1. In your directory or on a domain controller, open the command prompt as an administrator, type gpmc.msc, and then press ENTER.

2. In the left console tree, select the OU in which you want to create a new GPO, or use an existing GPO, and then do either of the following:

• Create a new GPO by opening the context (right-click) menu and choosing Create a GPO in this domain, Link it here. For Name, provide a descriptive name for this GPO.

• Select an existing GPO.

3. Open the context menu for the GPO, and choose Edit.

4. Under User Configuration, expand Preferences, and then choose Windows Settings.

5. Open the context (right-click) menu for Registry and choose New, Registry Item.

6. In the New Registry Properties dialog box, specify the following registry settings for Group Policy to configure:

• For Action, choose Update.

• For Hive, choose HKEY_CURRENT_USER.

• For Key Path, browse to and select HKEY_CURRENT_USER\SOFWARE\Microsoft\Internet Explorer\Main.

• For Value Name, enter Start Page.

7. On the Common tab, choose Apply Once, Do not Re-Apply.

Note

To enable your users to choose the Use Default button in their Internet Explorer browser settings and reset their default home page to your company home page, you can also set a value for Default_Page_URL without choosing Apply Once and Do not Re-Apply.

8. Choose OK and close the GPMC.

## Use the AppStream 2.0 Template User Account to Change the Default Internet Explorer Home Page

Follow these steps to use the Template User account to change the default Internet Explorer home page.

To change the default Internet Explorer Home page by using the Template User account

1. Open the AppStream 2.0 console at https://console.aws.amazon.com/appstream2.

2. In the left navigation pane, choose Images, Image Builder.

3. Choose the image builder on which to change the default Internet Explorer home page, verify that it is in the Running state, and choose Connect.

4. Log in to the image builder by doing either of the following:

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Template User.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, specify the credentials for a domain user account that does not have local administrator permissions on the image builder, then choose Log in.

5. Open Internet Explorer and complete the necessary steps to change the default home page.

6. In the upper right area of the image builder desktop, choose Admin Commands, Switch User.

• If your image builder is not joined to an Active Directory domain, on the Local User tab, choose Administrator.

• If your image builder is joined to an Active Directory domain, choose the Directory User tab, and log in as a domain user who has local administrator permissions on the image builder.

8. On the image builder desktop, open Image Assistant.

9. Follow the necessary steps in Image Assistant to finish creating your image. For more information, see Tutorial: Create a Custom AppStream 2.0 Image.

## User and Instance Metadata for AppStream 2.0 Fleets

AppStream 2.0 fleet instances have user and instance metadata available through Windows environment variables. You can use the following environment variables in your applications and scripts to modify your environment based on the fleet instance details.

Environment Variable Context Description
AppStream_Stack_Name User The name of the stack that the streaming session started from.
AppStream_User_Access_Mode User The access mode that the user is using to stream. The values are custom, userpool, or saml.
AppStream_Session_Reservation_DateTime User The date and time when the user’s streaming session started.
AppStream_UserName User The user name for the user.
AppStream_Session_ID User The session identifier for the user's streaming session.
APPSTREAM_SESSION_CONTEXT Machine

The session context that was provided when the streaming URL was created.

Note

This environment variable is only available when you use the AppStream 2.0 CreateStreamingURL API action with the SessionContext parameter.

AppStream_Image_Arn Machine The ARN of the image that was used to create the streaming instance.
AppStream_Instance_Type Machine The instance type of the streaming instance. For example, stream.standard.medium.
AppStream_Resource_Type Machine The type of AppStream 2.0 resource. The value is either fleet or imagebuilder.
AppStream_Resource_Name Machine The name of the fleet.