> I want to learn to upgrade kernel You have a couple options. One is using redhat's up2date. It will automatically do everything for you; however, since this probably isn't what you had in mind, find redhat rpm's your machine. Be sure you know what type of machine you have. To find out, try the command uname -p. Then find the rpm for the kernel, the kernel source, and the docs. Then to install them do rpm -ivh kernel name rpm -ivh kernel source name rpm -ivh kernel doc names Now reboot. You should have 2 kernels listed in your grub. Choose the newer one. If you have problems, you can always reboot back into your old one. Of course, you could try building your own from source, but that might be a bit ambitious. If you do try to build your own, you will end up with a better kernel for your machine, but be prepared for some down time and have your disc's ready to do rescue mode.