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The Citrix XenApp Reference Design

The Citrix XenApp Reference Design
Table of Contents
Part One Executive Summary
1.1      Introduction
1.2      Implementation Overview
1.3      Document Overview
2.        Architectural Overview
2.1      Overall Architecture
2.2      XenApp Design
2.3      Support
Part 1 Reference Design
3.        XenApp Architecture
3.1      Farm Configuration
3.2      Data Store and License Server Configuration
3.3      Application Integration
3.4      Load Management
3.5      Features and components of XenApp Server
3.6      XenApp Server Configuration
3.7      Client Environment
3.8      Web Interface Configuration
3.9      Printing Architecture
4.        Shared Infrastructure Components
4.1      Hardware Virtualization Architecture
4.2      Operating System Configuration and Lockdown
4.3      Active Directory Integration
4.4      Profile and Policy Management
4.5      User Logon Process
4.6      Data Storage
4.7      Network Topology
4.8      Network Security Architecture
5.        Perimeter
Password Manager
5.1      Application Access Definition Design
5.2      Local Credential Storage
5.3      Agent Synchronization Architecture
5.4      Password Generation Policies Design
5.5      Password Sharing Groups Design
5.6      Agent Settings and User Interface Design
5.7      Agent Deployment Design
6.        Support Services Citrix On-line
6.1      Support Structure
6.2      GoToAssist Design 
1.1      Introduction
The XenApp Platinum Reference Design is a best-practice based comprehensive standard. The XenApp Platinum Reference Design was designed with simplicity, reproducibility, usability, scalability, supportability, security, privacy and accessibility in mind.
The XenApp Platinum Reference Design represents a complete XenApp Platinum standard that can be leveraged as a vanilla solution or modified to more accurately reflect organizational-specific needs. The XenApp Platinum Reference Design includes the following categories and solutions:
  • Perimeter. A secure perimeter for internal and external access.
  • Hardware Virtualization. Hardware virtualization provides an abstraction layer that allows multiple virtual machines to share the processor, memory, storage and networking resources ofa shared hardware environment allowing server consolidation, and rapid server provisioning.
  • XenApp. Citrix XenApp enables the centralization, management and delivery of Windows applications.
  • Application Streaming. Citrix XenApp Streaming allows applications to be packaged, streamed and executed in an isolated environment on XenApp Servers or Windows Desktops.
  • Enterprise Single Sign-on. Citrix Password Manager enables single-sign on capabilities for published and local applications, whether they are host (legacy), web, or windows based.
  • Server Utilization Monitoring: Citrix EdgeSight for XenApp monitors applications, devices, and the network in real time, allowing organizations to quickly analyze, resolve, and proactively prevent problems.
  • Web Interface Portal. A consistent user interface containing XenApp applications, streamed desktop applications, web applications, web content, documents, announcements and information.
1.2      Implementation Overview
The XenApp Platinum Reference Design provides a well defined starting point for each implementation. It also serves as a baseline upon which all solution additions, revisions, and tools will be based.  As such, there is an increasing value to XenApp Platinum Reference Design users in keeping implementations as close to the reference design as possible.
Prior to implementing XenApp Platinum based upon the XenApp Platinum Reference Design, it’s important that an infrastructure assessment and gap analysis be performed. During the IA/GA, the architecture of the solution will be customized to match the customer’s business needs while maintaining the integrity of the XenApp Platinum Reference Design. Implementation and support will follow the analysis phase after careful consideration has been given to any specific design modifications that deviate from the reference.
1.3      Document Overview
This document outlines the decision points necessary for implementing the XenApp Platinum Reference Design. For decisions that rely on pre-existing factors or specific organizational needs, the appropriate best practice has been provided. The best practices should be analyzed carefully and decisions should be made based on organizational needs, architecture present and budget resources availability.
2.     Architectural Overview
2.1      Overall Architecture
The XenApp Platinum Reference Design is designed to be scalable and resilient for ease of implementation, high availability, and ease of maintenance. The complete solution is made up of six architectural components that work together to provide flexibility and options with respect to server consolidation, monitoring, authentication and security requirements, user access scenarios, and component migration/modification.  The design breaks down into the following six components:
  • Perimeter. The XenApp Platinum Reference Design supports the use of multiple secured perimeters. This allows for flexibility in global load balancing, accommodating different applications and their performance requirements, authentication, security, and branding (look/feel) requirements. It also supports techniques for multiple brands, making it possible to support multiple business unites, and partners.
  • The XenApp Server farm. The XenApp Platinum Reference Design may have one or more XenApp Server farms available to provide application resources for the environment. This design builds on the ability to test new farm builds alongside production farm builds, leveraging the other two components without sacrificing the integrity of the production environment. This will allow the customer to be agile and proactive in their efforts to deliver the most current, feature rich, stable OS, application functionality, and XenApp Server versions. 
  • Application Streaming. The XenApp Platinum Reference Design will support an organizations entire application portfolio with a single Citrix XenApp Server silo. Application streaming allows applications to be packaged, streamed and executed in an isolated environment on Citrix XenApp Servers or to Windows Desktops. Application streaming used in conjunction with XenApp CPU management allows organization to safely run an entire application portfolio on a single XenApp Server silo.  
  • Server Utilization Monitoring: The XenApp Platinum Reference Design provides complete transparency from an end user perspective to any application running on a XenApp farm to see exactly what’s happening for a specific user or group of users. Citrix EdgeSight allows organizations to consistently and quantitatively measure performance across the organization for all XenApp hosted applications.
  • Hardware Virtualization. The XenApp Platinum Reference Design offers a generic hardware virtualization layer that allows multiple Windows and Linux virtual machines to run on a shared hardware environment allowing x86 and x86-64 bit server consolidation, and rapid VM provisioning.
  • Web Interface Portal. The XenApp Platinum Reference Design supports existing corporate portals used to deliver both XenApp and streamed desktop application using Citrix XenApp Platinum.
Figure2.0 show a high level overview of the XenApp Platinum Reference Design components.
The XenApp Platinum Reference Design supports a variety of access scenarios, providing users with the most functional, best performing user experience possible. The user is guided to the appropriate access scenario through end point analysis and global load balancing. The users’ location, device/operating system type, browser version, and connectivity method can be considered. The two primary supported use cases, with available services/functionality, are listed below:

1 – Win32 OS, Internet Explorer, broadband quality connectivity. 

To read the entire article at its source, please refer to the Citrix XenApp Reference Design

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