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Planning
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There is another design driver that is particularly salient in larger organizations: WSUS can be administered only by users who are local administrators on the WSUS server. There is no other way to delegate administration of WSUS. Therefore, you should co-locate WSUS only with other services and resources for which the same users are administrators. This security and delegation characteristic also suggests that, where possible, WSUS should be installed on a member server rather than on a domain controller. Otherwise, to administer WSUS, a user must be logged on with credentials that have administrative privileges for the entire domain.
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Using SUS, a server could have only one list of approved updates. Therefore, if you wanted to deliver different sets of updates to different clients for example, one collection of updates to servers and a different collection of updates to workstations you needed to point each group of computers to a separately administered SUS server.
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9
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Maintaining the Operating System
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WSUS introduces the concept of client groups, which allows you to create virtual collections of systems, each of which can receive a unique set of updates on a unique release schedule. For example, you might create a group called Test Systems for which you approve updates for installation soon after Microsoft releases the updates. If these test systems prove that the updates are appropriate for your organization, you can then approve the updates for installation on other computers. Using client groups, you can support many update configurations using a single WSUS server. Therefore, with WSUS, you no are no longer forced into a multiple-server model solely to support multiple combinations of updates. The purpose of using multiple WSUS servers is solely to deliver the updates with minimal network cost to update clients. After selecting the servers on which WSUS will be hosted, you must determine how updates will flow from Microsoft Update to each server. One or more servers can synchronize their updates directly from Microsoft Update. Each such server can be independently administered, allowing you to have a completely unique collection of approved updates on each server. In a highly decentralized update infrastructure, this might be desirable. A more typical configuration involves one upstream WSUS server that synchronizes from Microsoft Update, with other downstream servers synchronizing from that server. You can, in fact, have several levels of downstream servers, each pointing to an upstream server as its source for updates. However, update service models more than three levels deep are not recommended. A hierarchical configuration can be structured in two ways: as a replica or as a decentralized model. In a replica model, the downstream WSUS server mirrors exactly the updates and approvals of its upstream server. This highly centralized administrative model ensures consistently applied updates. Clients pointed to either of the WSUS servers will receive the same updates. The only differences between two replicas are the set of computers that have been pointed to each server and, therefore, the specific computers that belong to client computer groups on each server. In a decentralized model, each downstream server synchronizes updates from an upstream server, but update approvals are managed on each downstream server individually. Downstream servers will synchronize an update from its upstream server only if the update has been approved on the upstream server. Therefore, the upstream server, rather than Microsoft Update, acts as the authoritative source of available updates. Administrators of downstream servers can approve any subset of those updates. Such a structure allows administrators of upstream servers to prevent updates that might cause problems from propagating to downstream servers and clients.
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Lesson 1
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Windows Server Update Services
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Installing WSUS on a Windows Server 2003 Computer
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An update infrastructure has both client and server components. The client component, Automatic Updates, will be discussed later in this lesson. The server component, WSUS, runs on Windows 2000 Server (Service Pack 4) or Windows Server 2003 on a 32-bit system. WSUS cannot be installed on 64-bit Windows Server 2003 platforms. This is an important exception. Windows Server 2003 64-bit systems can be clients of WSUS: they can receive updates from WSUS but cannot actually provide update services to other clients. WSUS is not included with the Windows Server 2003 media, but it is a free download from the Microsoft WSUS Web site at http://www.microsoft.com/wsus. WSUS includes the SQL Server 2000 Desktop Engine (Windows) (WMSDE) database, which is required to support WSUS, unless you choose to use an instance of SQL Server 2000 or later. WSUS requires BITS 2.0 or later, which is integrated into SP1 and can be downloaded separately from the WSUS site for earlier versions of Windows Server 2003 or Windows 2000.
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Note The WSUS download is not available in every localized language. However, this download determines the installation and administrative interface for the server component only. Patches for all locales can be made available through WSUS.
Prior to installing WSUS, you must install IIS, which, as you learned in 6, is not installed by default on Windows Server 2003. For information about how to install IIS, see 6. You must also install BITS 2.0 or later if the server is not running SP1. Then run the WSUS installation package. After you agree to the license agreement, the Setup Wizard will prompt you for the following information:
Select Update Source Each update consists of two components: the patch file itself and metadata that specifies the platforms and languages to which the patch applies. WSUS always downloads metadata, which you will use to approve updates and which clients on your intranet will retrieve from WSUS. You can choose whether to download the update installation files themselves and, if so, where to save the updates.
If you elect to maintain the update files on Microsoft Windows Update servers, Automatic Updates clients will connect to your WSUS server to obtain the list of approved updates and will then connect to Microsoft Update servers to download the files. You can thereby maintain control of client updating and take advantage of the globally dispersed hosting provided by Microsoft.
9-10
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