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Securing-Optimizing-RH-Linux-1_2_91
Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 91 Formatting ... done Verifying ... done 2.     Copy the file “vmlinuz” from the “/boot” directory to the floppy disk: [root@deep /]# cp /boot/vmlinuz /dev/fd0 cp: overwrite `/dev/fd0'? y The “vmlinuz” file is a symbolic link that point to the real Linux kernel. 3.     Determine the kernel’s root device with the following command: [root@deep /]# rdev /dev/sda12 / The kernel’s root device is the disk partition where the root file system is located. In this example, the root device is “dev/sda12”; the device name may be different on your system. 4.     Set the kernel’s root device with the following command: [root@deep /]# rdev /dev/fd0 /dev/sda12 To set the kernel’s root device, use the device reported by the “rdev” command utility in the previous step. 5.     Mark the root device as read-only with the following command: [root@deep /]# rdev -R /dev/fd0 1 This causes Linux initially to mount the root file system as read-only. By setting the root device as read-only, you avoid several warning and error messages. 6.     Now put the boot floppy in the drive A: and reboot your system with the following command: [root@deep /]# reboot Update your “/dev” entries If you have added a new devices to your system or have done recently a major kernel upgrade (a major kernel upgrade is for example when you pass from kernel version 2.2.9 to 2.2.15 directly), it may be important to update your “/dev” entries to avoid problems related to missing devices. We can accomplish this task with the MAKEDEV script utility that scan the “/dev” directory where all devices that interfaces with drivers in the kernel are keep. A special option named “update” allow the MAKEDEV utility to create new devices that you are configured in your kernel and delete those which are no longer configured. · To update your “/dev” entries, execute the following commands: [root@deep /]# cd /dev [root@deep /dev]# ./MAKEDEV update