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One important utility is Xconfigurator, the X Window System configuration program. If you have trouble with your X Window System configuration, you can use this utility to configure it again. Xconfigurator is also helpful for updating your X Window System if you change your video card. Simply run Xconfigurator again and select the card. You can run Xconfigurator by entering the Xconfigurator command on the command line, or by selecting the X configuration entry in the setuptool utility's menu.
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Xconfigurator first probes your system in an attempt to determine what type of video card you have. Failing that, Xconfigurator presents a list of video cards. Select your video card from the list and press ENTER. If your video card does not appear on the list, XFree86 may not support it. If you have technical knowledge about your card, however, you may choose Unlisted Card and attempt to configure it by matching your card's video chipset with one of the available X servers. Once you select your video card, the installation program installs the appropriate XFree86 server, and Xconfigurator presents a list of monitors. If your monitor appears on the list, select it and press ENTER. If it is not on the list, select Custom. This displays a screen where you enter the horizontal sync range and vertical sync range of your monitor (these values are generally available in the documentation that accompanies your monitor or from your monitor's vendor or manufacturer). Be careful to enter the correct horizontal and vertical frequencies. If you enter values that are too high, you may overclock your monitor, which could damage older models. You should not select a monitor similar to your monitor unless you are certain the monitor you are selecting does not exceed the capabilities of your monitor. The next screen prompts you for the amount of video memory installed on your video card. If you are not sure, please consult the documentation accompanying your video card. Choosing more memory than is available does not damage your video card, but the XFree86 server may not start correctly if you do. If the video card you selected has a video clock chip, Xconfigurator presents a list of clock chips. The recommended choice is No Clockchip Setting because, in most cases, XFree86 can automatically detect the proper clock chip. In the next screen, Xconfigurator prompts you to select the video modes you want to use. These are screen resolutions you may want to use. You can select one or more by moving to it and pressing the SPACEBAR. Xconfigurator then starts the X Window System and displays a dialog box asking if you can see it. Note Xconfigurator then generates an X Window System configuration file called /etc/X11/XF86Config. This is the file the X Window System uses to start up.
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Updating your Red Hat system has become a very simple procedure, using an automatic update utility called the Red Hat Update Agent. With the Red Hat Update Agent, downloading and installing updates can be accomplished with just a few mouse clicks. The Red Hat Update Agent takes advantage of an update service provided by the Red Hat Network. Registering with and configuring access to the Red Hat Network is a very simple procedure. New versions of distributions are often released every 6 to 12 months. In the meantime, new updates are continually being prepared for particular software packages. These are posted as updates you can download from the Red Hat FTP site and install onto your system. These include new versions of applications, servers, and even the kernel. In the period between major releases, Red Hat posts RPM package updates for software installed from your CDROM on its Web sites on the Red Hat Errata page at www.redhat.com/support/errata. Here you will find updates for different Red Hat releases. For the current release, updates are
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organized by security advisories, bug fixes, and package enhancement. Such updates may range from single software packages to whole components-for instance, all the core, application, and development packages issued when a new release of Gnome, KDE, or XFree86 is made available. Red Hat provides the Red Hat Network (RHN) that you can use to update your Red Hat system securely and automatically. The Red Hat Network provides secure access to officially certified updates, including bug fixes and security advisories. You can access the RHN either through a Web browser or with the Red Hat Update Agent installed on your system. This is an improved version of the Update Agent used in 6.2. With the Red Hat Update Agent, you can automatically locate, download, and install any updates for your Red Hat system. To use the Red Hat Network, however, you first must register using the Red Hat Network Registration client. Once registered, you are then provided with a user name and password with which to access the Red Hat Network where you can set up access to the Software Manager that will automatically download your updates through the Red Hat Update client. To start the Red Hat Network, select its entry in the Gnome System menu. The first time you use RHN, you will be asked to register. You are asked for your root user password as an added precaution. You will need to specify a user name and password, along with any other user information you want to provide. A system profile is then created, consisting of your hardware specifications and the packages you want to update. Your system is automatically probed for its hardware configuration. A list of all the RPM packages on your system is then generated with all entries selected. These will be the packages that the RHN network will update. You have the option of deselecting those you don't want to update. You then need set up access by your system to the Software Manager, identifying your computer by its host name. This enables access to Red Hat updates. Log into the Red Hat Network using your username and password, and then click the Your Network tab at the top to display the overview screen for your network. An entry should be there for your registered system with an upgrade link under the service level. Click the upgrade link (see Figure 4-9).
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Figure 4-9: Red Hat network system overview This displays a screen showing your status and the systems that have been added to the Software Manager. Initially your system will be in the "no service" box, shown on the left in Figure 4-10. Click its entry and click the Upgrade >> button to add it to the Software Manager
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box on the left. Then click the Update Account button at the bottom. Your Red Hat Update Agent now has access to the Red Hat Network and its updates. When you return to the network overview screen, you will see that your system has been activated and the upgrade link is gone.
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Figure 4-10: Red Hat Network Software Manager access Once you have registered and set up access to the Software Manager, you can access the RNN automatically with the Red Hat Update Agent (or manually with a Web browser). Once notified of updates, the Red Hat Update Agent will download and install them for you. To use the Red Hat Update Agent, you first have to configure it. On the Gnome desktop, select the Update Agent Configuration entry on the System menu. This displays the Configuration dialog box, shown in Figure 4-11, with three tabbed panels: General, Retrieval/Installation, and Package Exceptions. On the General panel you can enable your HTTP proxy server, should your ISP or local network use one. The Retrieval/Installation panel is where you enter download instructions and the download directory you want to use. The Package Exceptions panel holds the names of any packages you do not want to automatically update.
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Figure 4-11: Red Hat Update Agent configuration You are now ready to run the Red Hat Update Agent. Select Update Agent from the Gnome System menu. The first time you use the agent, you are prompted to install Red Hat GPG key. Click Yes to install. The Red Hat Update Agent then lists the possible updates it found. You can select individual packages by clicking the checkboxes nextto them or click the Select All Packages checkbox to select them all (see Figure 4-12).
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Figure 4-12: Red Hat Update Agent package selection When you click Next, the packages you selected are downloaded. Information for each package is displayed along with its download progress (See Figure 4-13). Once downloaded, the packages are installed. That is all there is to it.
Figure 4-13: Red Hat Update Agent software download Note Network administrators can use the Red Hat Network to download and install updates to several Red Hat systems on their network. Tip If you installed Ximian Gnome (see 8), you can use Ximian's Red Carpet update utility to update Red Hat.
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