RedHatEnterpriseLinux2.9.5AS release notes

Article title: RedHatEnterpriseLinux2.9.5AS release notes. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
These release notes cover the following topics:
　　
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Guide Anaconda
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Installation-related remarks
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General remarks
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Kernel remarks
　　
Guide Anaconda
　　
This section describes the processes required to guide the Red Hat Enterprise Linux installation program (Anaconda.
　　
The first CD is bootable and can be used to start the installation process. If you do not want to use a CD-based installation (for example, if you want to install Red Hat Enterprise Linux 2.9.5AS through a network connection), only the CD image file boot required to start the process is included. iso can be found in the images/directory of the first disc.
Installation-related remarks
　　
This section describes problems related to the Red Hat Enterprise Linux installer Anaconda.
　　
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The steps for Red Hat Enterprise Linux 2.9.5AS to process the CD have been changed. You need the first disc when guiding the installation program, and you need it after processing the remaining disc.
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Red Hat Enterprise Linux installer can test the integrity of the installation media. It can be used in CD, hard disk ISO, and nfs iso installation methods. Red Hat recommends that you test all the installation media before installation and before reporting any installation problems (many submitted errors are caused by incorrect discs ). To perform the test, enter the linux mediacheck command at boot: prompt.
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Most modern computers can boot the installation process directly from the first Red Hat Enterprise Linux release CD. boot disks are required for some hardware configurations. If your hardware needs boot disks, pay attention to the following changes.
　　
Red Hat Enterprise Linux 2.9.5AS uses a different boot disk layout from the previous Red Hat Enterprise Linux version. This version uses only one boot disk image file (bootdisk. img) to guide all systems that require boot disks.
　　
If you perform a task other than installation from an IDE or USB device, you are asked to insert a driver disk created based on one of the following image files:
　　
-Drvnet. img-used for network installation
　　
-Drvblock. img-used for SCSI installation
　　
-Pcmciadd. img-for PCMCIA installation
　　
Like the previously released Red Hat Enterprise Linux, these image files can be found in the images/directory on the first installation disc.
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Use the text mode installation of the serial terminal and use it when the terminal supports UTF-8. In UNIX and Linux, Kermit supports UTF-8. In Windows, Kermit '95 also runs well. If the installation is in English, terminals that do not have the UTF-8 capability can also run. The enhanced window display can be used by passing the "utf8" boot time option to the installer. For example:
　　
Linux console = ttyS0 utf8
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Now you can use VNC to install it. To enable VNC-based installation, pass the "vnc" option during the boot time. If necessary, pass "vncpassword =" to the boot time option You can also set a password. VNC displays" : 1 ".
　　
General remarks
　　
This section contains general remarks related to post-installation issues.
　　
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The Eclipse integrated development environment has been added to Red Hat Enterprise Linux 2.9.5AS. Eclipse 2.1 supports Java and C/C ++ projects, and provides editing, compilation, and debugging environments, and support for file builders in the RPM and OProfile systems. For more information, see the Eclipse website: http://www.eclipse.org/
　　
Note: Sun JDK version 1.4.1 is required for Eclipse included in Red Hat Enterprise Linux 2.9.5AS.
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The Apache HTTP Server has been updated to version 2.0. The updated software package replaces version 1.3 and is renamed as httpd.
　　
-The auth_ldap, mod_put, mod_roaming, mod_auth_any, mod_bandwidth, mod_throttle, and mod_dav modules have been deleted.
　　
-The WebDAV function has been included in the httpd software package.
　　
Note: You may need to change the existing configuration file. Third-party Apache modules may also need to be updated. For details, see at/usr/share/doc/httpd- /Migration.html Migration Guide.
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Red Hat Enterprise Linux 2.9.5AS supports using PXE (Pre-Boot Execution Environment) for network Boot. Like the previous release version, you may configure Red Hat Enterprise Linux 2.9.5AS as the installation server, which prepares the kernel and image files for network installation.
　　
Red Hat Enterprise Linux 2.9.5AS also provides support for diskless environments. A server without a disk environment (similar to the installation server). The diskless client system provides kernel files and image files. After the boot, the diskless client system mounts the root file system through NFS, so that you do not need to use a local storage device.
　　
Redhat-config-netboot graphical configuration attack allows you to configure two environments.
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Red Hat Enterprise Linux 2.9.5AS contains a new graphical cluster configuration tool (redhat-config-cluster ). It is the preferred tool for cluster configuration.
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CUPS is now the default printing off-line, and redhat-config-printer is the tool we recommend to configure it. It can be started from the system settings menu and use the print menu item.
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GNOME print manager, a simple graphical print queue management tool, is now included. It can be started from the System Tools menu and use the print manager menu item. In addition, when a print job is in the queue, an icon appears in the system notification area of the panel.
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Red Hat Enterprise Linux 2.9.5AS includes Native POSIX Thread Library (NPTL), which is a new implementation of POSIX threads in Linux. This library improves performance and increases scalability.
　　
The thread library is designed to be binary compatible with the original LinuxThreads implementation. However, applications dependent on the implementation of the POSIX standard LinuxThreads will need to be corrected. Note the following differences:
　　
-Signal processing has changed from signal processing per thread to POSIX process signal processing.
　　
-Getpid () returns the same value in all threads.
　　
-If vfork () is used, the thread handler registered with pthread_atfork will not run.
　　
-No management thread.
　　
Known applications that encounter problems when using NPTL include:
　　
-Sun JRE earlier than version 1.4.1
　　
-IBM JRE
　　
If an application cannot run properly using NPTL, it can run with the original LinuxThreads implementation by setting the following environment variables:
　　
LD_ASSUME_KERNEL =
　　
The available versions are as follows:
　　
-2.4.19-Linuxthreads with floating stack
　　
-2.2.5-Linuxthreads without floating stacks
　　
Note that software using errno, h_errno, and _ res must include (# include) the appropriate header files (errno in sequence) before they are used. h. netdb. h, and resolv. h ). However, before the software is corrected, you can use LD_ASSUME_KERNEL = 2.4.19 as a bypass measure.
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The new system message has been added to Red Hat Enterprise Linux 2.9.5AS:
　　
Application Error: The SIGCHLD of () is set to SIG_IGN, but wait () is called (). (See "man 2 wait" in this note ). The bypass action is activated.
　　
The message (displayed on the system console and/or system log files) indicates that the application is not fully compliant with the standard in processing sub-processes. If you see this message, you should warn the developer of the application.
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Fileutils, textutils, sh-utils, and stat packages have been replaced by the new coreutils package.
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The RPM containing the network management tool has been renamed and its function has changed. Redhat-config-network RPM contains the graphical user interface of the tool. redhat-config-network-tui contains the tool itself (and its text-based user interface ).
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Support for XHTML1-HTML restructuring in XML-has been improved. This is achieved by adding xhtml1-dtd packages, installing DTD in the system directory, and adding original support to libxml2 and ttproc tools.
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The XML toolkit has been extended. It now supports Relax-NG verification and streaming of large files.
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The Oprofile system range file builder has been added to Red Hat Enterprise Linux 2.9.5AS. OProfile is a tool used by programmers to analyze system performance. It uses special hardware built in many modern computers. The OProfile document is located in the oprofile package. after installation, Red Hat Enterprise Linux 2.9.5AS uses the rpm-qd oprofile command to obtain a list of available documents. For more information, see OProfile's website: http://oprofile.sourceforge.net.
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GDB has been promoted to allow the debugging information of the application to be read from different files. This makes it possible to extract debugging information from the library and place the information in the additional software package. During the development of Red Hat Enterprise Linux 2.9.5AS, by implementing special RPM macro commands, the "debuginfo" software package is generated for almost all software packages. According to the default settings, the RPM Macro command in Red Hat Enterprise Linux 2.9.5AS generates the "debuginfo" package and adds the following to your ~ /. Rpmmacros file:
　　
% Debug_package % {nil}
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Currently, the X window system uses two font subsystems with different characteristics:
　　
-The original (more than 15 years old) subsystem is called "core X font subsystem ". The font drawn by this subsystem is not a smooth font, which is processed by the X server with the same name:
　　
-Misc-fixed-medium-r-normal -- 10-100-75-75-c-60-iso8859-1
　　
The new fontconfig sub-system is called "fontconfig ". It allows applications to directly use font files. Fontconfig is often used with the "Xft" library, which allows applications to draw smooth fonts on the screen. The names used by fontconfig are more humane. they are similar:
　　
Luxi Sans-10
　　
Over time, fontconfig/Xft will replace the core X font child