Citrix XenDesktop Architecture Deep Dive Part Three.ppt
Transcript of Citrix XenDesktop Architecture Deep Dive Part Three.ppt
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The architecture can be broken down into six core components:
1. Virtualization Infrastructure: The virtualization infrastructure allows for the dividing of a single physical server into multiple virtual servers all sharing resources. The virtualization infrastructure for this pilot architecture is based on XenServer as it is included as part of the XenDesktop overall solution. The virtualization infrastructure could also leverage Microsoft Hyper-V or VMware ESX.
2. Virtual Desktop Delivery Controller: The virtual desktop delivery controller is responsible for the registration of new virtual desktops and directing requests for virtual desktops to available systems. Users interact indirectly with the controller via the integrated Web Interface component. Through a web-based site, or through a locally installed receiver, users will be delivered their virtual desktop.
3. Virtual Desktop Provisioning: The provisioning server aspect of the XenDesktop solution delivers an operating system image to the virtual desktop instance on the virtualization infrastructure. A base operating system image is created that contains all operating system-level configurations as dictated by the organization’s policies. The base image, however, does not contain applications. As each virtual desktop boots, the operating system is streamed over the network to the virtual desktop. The power of this solution is identified when updates are
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required as only the base image requires updating and all virtual desktops will utilize the latest image upon next reboot. By stripping out the applications, a single instance of each operating system version is required for an organization.
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End-Point
Desktop Receiver: The Citrix client installed on the end-point, which allows connections to the virtual desktop using the Citrix ICA protocol.
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Access Gateway
SSL-VPN: Acts as a secure proxy from the external end-point to the virtual desktop. Traffic leaving the SSL-VPN and destined for the public network is encapsulated within SSL. The SSL-VPN website is where users enter in their logon credentials.
Authentication Service: Responsible for providing Web Interface with credentials. This process allows the user to authenticate once to the SSL-VPN and have the remaining authentication challenges provided automatically.
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Desktop Delivery Controllers (XenDesktop Servers)
Web Interface: Responsible for providing a graphical display for users to see their available virtual desktops.
XML Service: Responsible for communications between the Web Interface component and the XenDesktop farm. The XML Service authenticates users, provides a list of available virtual desktops, and generates the information to allow the end-point to make a connection to the virtual desktop.
Controller Service: Responsible for communicating with the Virtual Desktop Service on the virtual desktops. The Controller Service registers the virtual desktops and maintains the virtual desktop state.
Pool Service: Based on the XenDesktop farm configuration, the Pool Service contacts the virtualization infrastructure to spin up/down a virtual desktop.
IMA Service: The IMA Service is responsible for all inter-server communication between Desktop Delivery Controllers. This includes the traffic going to and coming from the data collector.
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Virtual Desktop
Virtual Desktop Service: Responsible for registering with a Desktop Delivery Controller and maintaining a heartbeat with the controller. If the heartbeat fails, the Virtual Desktop Service will re-register with another available Desktop Delivery Controller.
Application Receiver: With appropriate credentials, the Application Receiver contacts the Application Delivery Controller to receive a list of available applications. The Application Receiver also is responsible for making requests to the Application Delivery Controllers for application launches.
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Application Delivery Controllers (XenApp Servers)
Web Interface: Responsible for providing a set of available applications to the Application Receiver based on user credentials.
XML Service: Responsible for communications between the Application Delivery Controller’s Web Interface component and the XenApp farm. The XML Service authenticates users, provides a list of available applications, and generates the information to allow the virtual desktop to make a connection to the application (hosted or streamed).
IMA Service: The IMA Service is responsible for all inter-server communication between Application Delivery Controllers. This includes the traffic going to and coming from the data collector.
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Provisioning Servers
TFTP: When a new virtual desktop boots, it contacts DHCP to find an IP address and the location of the boot file. The boot file comes from the Provisioning Server via the TFTP service.
Streaming Service: After the virtual desktop receives the boot file with instructions, it contacts the provisioning server and provides its MAC address. Provisioning Server identifies the correct virtual disk based on the MAC address and uses the Streaming Service to send portions of the virtual disk to the virtual desktop as needed.
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Virtual Desktop Startup
The first stage of the XenDesktop architecture is getting virtual desktops online. The Data Collector refers to the Idle Desktop thresholds and determines current availability. When a new virtual desktop is required to meet the idle threshold limits, the Data Collector implements the startup procedure with the following process:
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Authentication
Users will need delivery of a virtual desktop. This requires proper authentication. For external users, the authentication happens initially at the Access Gateway, which prevents unauthorized users from gaining access to the internal network. The authentication process happens as follows:
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Virtual Desktop Connection
Once users have properly authenticated, they must make a request for an available virtual desktop. This requires the user to select a single icon or the environment could be configured to auto-launch the desktop upon completion of the authentication process. Regardless of the solution selected, the process flows as follows:
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Virtual Desktop Personalization
Once the virtual desktop has launched, the last item to accomplish is to integrate the applications into the virtual desktop. This process happens automatically as follows, when integrated with XenApp.
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Pilot Considerations
As the environment is being used with production data and with real users, it is advisable to build the environment with redundancy. The entire architecture can be made redundant with the duplication of key components.
Access Gateway: Multiple Access Gateway devices can be added and setup in a high-availability pair. If one Access Gateway were to fail, the other would take over automatically.
Desktop Delivery Controllers: Multiple Desktop Delivery Controllers should be used to provide redundancy.
o Web Interface: In the default setup, each Desktop Delivery Controllers contains a Web Interface site. Multiple Web Interface servers should be used to continue to allow availability if one fails.
o Data Collector: There is only one Data Collector in the XenDesktop Farm. If the Data Collector were to fail, another Desktop Delivery Controller would take on the role of the Data Collector automatically.
Virtualization Infrastructure: The virtualization infrastructure is the base for desktop virtualization. When XenDesktop is implemented with XenServer, multiple XenServers should be used and added to the same resource pool. If one XenServer fails, the other XenServer will still provide virtualization infrastructure to the virtual desktops. And the virtual desktops hosted from the failed XenServer can be
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