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To install a new kernel on Red Hat, you need to download the software packages for that kernel to your system. It is advisable to download the RPM packages for new kernels from the Red Hat FTP site. Alternatively, you can download the most recent version from www.kernel.org. You can install a new kernel either by downloading a binary version from your distribution's Web site and installing it or by downloading the source code, compiling the kernel, and then installing the resulting binary file. For Red Hat, the binary version of the kernel is provided in an RPM package. You can install a new kernel using the Red Hat Package Manager, just as you would any other RPM software package. The easiest way to install a new kernel on Red Hat is to use the Red Hat Update Agent. The Agent will not automatically select kernel file for download. Though listed, you have to explicitly select them for them to be downloaded and installed. The source code version is available either from the Red Hat FPT site, ftp.redhat.com for Red Hat, or from www.kernel.org. Wherever you download a kernel version from, it is always the same. The source code downloaded for a particular kernel version from Red Hat is the same as the one for www.kernel.org. Patches for that version can be applied to any distribution. If you wish to download kernel RPM packages directly from ftp://ftp.redhat.com, you will need to locate the corresponding updates directory for your Red Hat distribution, such as 7.1. A series of RPM packages are there, all beginning with the term kernel. There are also other packages you may need, which contain updated system configuration files used by the new kernel. As an example, the kernel packages for the 2.4 kernel are listed in the following code. Only install one of the kernel-version-ix86 packages and one of the kernel-smp packages. Choose the one for your machine for example, i686 for a Pentium II, i586 for a Pentium, and i386 for other PCs. The following list shows the RPM packages for the Red Hat version of kernel 2.4:
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kernel-2.4.7-10.i386.rpm kernel-2.4.7-10.althion.rpm kernel-2.4.7-10.i686.rpm
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kernel-doc-2.4.7-10.i386.rpm kernel-enterprise-2.4.7-10.i686.rpm kernel-headers-2.4.7-10.i386.rpm kernel-pcmcia-cs-2.4.7-10.i386.rpm kernel-smp-2.4.7-10.i386.rpm kernel-smp-2.4.7-10.althion.rpm kernel-smp-2.4.7-10.i686.rpm kernel-source-2.4.7-10.i386.rpm
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To make sure a kernel RPM package was downloaded without any errors, you can use the rpm command with the -K --nopgp options to check it:
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rpm -K --nopgp *rpm
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You are now ready to install the new kernel. First, install updated versions, if any, of other support packages. In Red Hat, these currently include mkinitrd, SysVinit, and initscripts. Use the -Uvh option to update those packages:
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# rpm -Uvh mkinitrd*rpm SysVinit*rpm initscripts*rpm
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Installing the source code and headers for the kernel is also essential. You use the source code to generate any modules and tailor the kernel to your own needs. For example, you can use the source code to generate modules containing devices drivers for any uncommon devices you may have installed, as shown here:
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# rpm -Uvh kernel-headers-2.4.7-10.i386.rpm # rpm -Uvh kernel-source-2.4.7-10.i386.rpm
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You can now install the kernel. On Red Hat systems, you install the kernel, kernel-ibcs, and the kernel-pcmia-cs packages. As a safety precaution, it is advisable to preserve your old kernel in case the new one does not work out for some reason. This involves installing with the install (-i) option instead of the update(-U) option, creating a separate RAM disk for the new kernel, and then modifying grub.conf to have GRUB start up using the new kernel.
# rpm -Uvh kernel-2.4.7-10.i686.rpm # rpm -Uvh kernel-pcmcia-cs-2.4.7-10.386.rpm # rpm Uvh kernel-smp-2.4.7-10.i686.rpm
On Red Hat, kernels are installed in the /boot directory. Performing an ls -l operation on this directory lists all the currently installed kernels. A file for your old kernel and a file for your new one now exist, as well as a link file called vmlinuz that links to the new kernel file. If you took the precautions described in the previous section, you may have already renamed the older kernel. On Red Hat, if you are using a boot loader like GRUB, you needn't change its configuration file (grub.conf) because the entry to invoke the kernel still references the /boot/vmlinuz link, which now points to the new kernel. Red Hat boots the kernel using the /boot/vmlinux link to the kernel file. In your grub.conf file, the kernel line for the kernel file references this link.
kernel = /boot/vmlinuz-2.4.7-10
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