Prevention is Better than Repair: Get ahead of Problems before they occur
Since a number of emergency scenarios can be caused by a few system problems, it would probably be worth your time to consider how to avoid these problems in the first place. The following are some preventive measures you can take:
When creating a LILO configuration file, make sure you maintain a section for both the new kernel and the old kernel. Incorrectly installing new kernels can be a recipe for disaster. Even if your new kernel has some unexpected problem, you have an existing, known kernel to fall back on.
Reuse the /usr/src/linux.config file created by the kernel configuration process when upgrading between kernel revisions. This helps ensure you don’t forget support for vital hardware.
It is also a good idea to maintain a boot disk with a known working kernel with as few modules as possible. The simplest way to create such a boot disk is to write a copy of your kernel directly to the floppy:
dd if=/boot/vmlinuz of=/dev/fd0
and then tell it which file system to mount as root:
rdev /dev/fd0 /dev/hda2
Then, if your system will not boot for some reason, you can fall back to a kernel on removable media.
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