Licensing Communication
An administrator must perform the following tasks for a license server to accept connection and license requests:
- Add a license file to the license server
- Configure the farm to use a specific license server
License Communication Process
The following steps describe the licensing communication process for checking out a license for a client device:
- A user connects to Farm A.
- A server in Farm A requests a license from License Server 1.
- License Server 1 grants the requests and checks out a license for the client device.
- The same users connects to Farm B.
- A server in Farm B requests a license from License Server 1.
- License Server 1 grants the requests and uses the existing license for the client device.
License Types
XenApp uses concurrent user licenses, which are licenses that are not tied to specific users.
When a server requests a license, it is reserved for a specific client device/user combination. When the user logs off from the session, the license is returned to the license pool and made available for another user. Users connecting from multiple devices will consume multiple licenses.
Microsoft Remote Desktop Services
XenApp extends the functionality of Microsoft Remote Desktop Services (formerly Terminal Services), which is a presentation virtualization platform for Windows Server.
XenApp 6 leverages Windows Server 2008 R2 security enhancements and Remote Desktop Services architecture to add dimensions of flexibility, manageability, security and Performance.
Remote Desktop Licensing
Administrators must configure a Remote Desktop Licensing server in the environment to distribute Remote Desktop licenses.
To avoid adding the Remote Desktop Licensing server to each new Remote Desktop Services server that joins the domain, administrators can configure an Active Directory group policy to automatically assign the Remote Desktop Licensing server to each new server that joins the domain.
Additional Licensing Considerations
Include the following:
- Different connections can consume multiple licenses.
- Most application manufacturers require user licenses for their products
License Administration Console
The License Administration Console is a required, web-based interface that allows an administrator to maintain the license server and manage license files for that license server.
The console can be used to perform the following actions:
- Tracking license usage
- Reporting on current license usage
- Configuring license alerts
- Configuring delegated administrators
Installing Licensing
It is a best practice to install the license server first. If licensing is installed after XenApp, a policy must be configured to point to the license server.
Licensing can exist on a separate server or can share a server with another component.
Uninstalling Licensing
An administrator may needto uninstall licensing for a variety of reasons, including moving the component to another system or renaming the system. Some of the files are not deleted, such as the license file.
When the license file is moved to a server with a different name from the current hostname, the license file must be returned to Citrix and exchanged for a license file that indicates the new server name.
License Server Considerations
Additional considerations include the following:
• XenApp does not need to be on the same system as the license server.
• For fewer than 200 product servers, a shared license server is recommended
License File Management
License files store the company license information in a plain text format with authenticated content. Each license file can store information for one or more licenses; a license server can store one or more license files.
The license file is stored on a license server in the
%PROGRAMFILES%\CITRIX\LICENSING\MYFILES\ Directory
Subscription Advantage
Citrix products include a one-year membership to Subscription Advantage. This membership provides major releases minor releases and product update downloads through the MyCitrix web site. The membership includes email notifications concerning the account and new items available for members. Members can view, update and obtain benefit information and privileges on MyCitrix at any time.
High Availability Considerations
A duplicate license server is one option for creating a backup license server. The backup license server must duplicate such essential information as the hostname and the server IP
address. This is especially important if the farm or servers are pointing to an IP address instead of the server name to resolve to the license server.
Additional License Server Processes
Additional License Server processes include:
• Enabling a replacement license server
• Connecting to a different license server
• Replacing the license server
License Server Clustering
Licensing provides administrators with a 30 day recovery grace period. To ensure high availability of the license server beyond the 30 day recovery grace period, licensing supports Microsoft clustering. Clustering the license server provides users with continuous access to applications in failure situations.
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