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TIP You probably don t need to install a new kernel just to add support for a new device. Kernels provide most device support in the form of modules, of which only those needed are installed with the kernel. Most likely, your current kernel has the module you need; you simply have to compile it and install it. For this task, see the Installing New Modules for the Kernel section in 7.
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You can learn more about the Linux kernel from kernel.org, the official repository for the current Linux kernels. The most current source code, as well as documentation, is there. Your distribution web site will also provide online documentation for installing and compiling the kernel on its systems. Several Linux HOW-TOs also exist on the subject. The kernel source code software packages also include extensive documentation. Kernel source code files are always installed in the /usr/src/linux-version directory, where version is the kernel version, as in /usr/ src/linux-2.4. In this directory, you can find a subdirectory named /Documentation, which contains an extensive set of files and directories documenting kernel features, modules, and commands. The following listing of kernel resources also contains more information. kernel.org The official Linux kernel web site. All new kernels originate from here. www.linuxhq.com Linux headquarters, kernel sources, and patches. kernelnewbies.org information. www.tldp.org Linux kernel sources and
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Several kernel features can be turned on or off without compiling and installing a new kernel or module, such
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as IP forwarding or the maximum number of files. These tunable parameters are controlled by the files in /proc/sys files. The proc file system is described in s 5 and 7. You can use the redhat-config-proc tool to assign values to these parameters. redhat-configproc is accessible from the More System Tools menu as Kernel Tuning. redhat-config-proc lists headings for Networking, File System, Virtual Memory, Kernel, and Hardware. Networking lets you control features such as IP forwarding, ICMP broadcast messages, and TCP time stamping. The File System option lets you set the maximum number of files. The Kernel option enables you to control logging, shared memory, and certain security features such as disabling debugging. The Hardware option lets you control RAID speeds. Parameters that you set are saved in the /etc/sysctl .conf file. Red Hat installs this file with basic configuration entries such as those for IP forwarding and debugging control. The redhat-config-proc tool overwrites this file, replacing it with entries for assigning values to different /proc/sys files. Changes to the /proc/sys file are not made until you click the Activate Saved Configuration button. For example, if you turn on IP forwarding in the Networking IP panel, the content of /proc/sys/net/ ipv4/ip_forward is set to 1, once you save and activate the proc values. Instead of using redhat-config-proc, you could use the sysctl command directly. The -p option causes sysctl to read parameters from the /etc/sysctl.conf file (you can specify a different file). You can use the -w option to change specific parameters. You reference a parameter with its key. A key is the parameter name prefixed with its proc system categories (directories), such as net.ipv4 .ip_forward for the ip_forward parameter located in /proc/sys/net/ipv4/. To display the value of a particular parameter, just use its key. The -a option lists all available changeable parameters. In the next example, the user changes the domain name parameter, referencing it with the kernel.domainname key (the domainname command also sets the kernel.domainname parameter): # sysctl -w kernel.domainname="mytrek.com"
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The following example turns on IP forwarding: # sysctl -w net.ipv4.ip_forward=1 If you use just the key, you display the parameter s current value: # sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 1
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