The Fedora Project provides a rescue CD with the Fedora Core 3 software set. The CD image The Fedora Core 3 Rescue CD contains those features needed to rescue your Fedora system if, for example, the system fails to boot because of a corrupted file system. The Rescue CD image is included on the Fedora DVD (in images/rescuecd.iso). As with the other Fedora Core CDs, you can also download this CD image separately from fedora.redhat.com/download.
It's a good idea to make a separate boot CD and store it for safekeeping. To create your Fedora Rescue CD from the image stored on the DVD, do the following:
With Fedora installed and running, insert the Fedora DVD into the DVD drive.
The Fedora DVD may mount automatically. If it does not, type something like the following (depending on the type of DVD drive you have) as root user from a shell:
# mount /media/cdrw_dvdrom
Copy the Rescue CD image to your hard disk:
# cp / media/cdrw_dvdrom/images/rescuecd.iso /tmp
Unmount your DVD, eject it, and remove it:
# umount /media/cdrw_dvdrom
Insert a blank CD into your CD burner.
Refer to the Red Hat Linux Getting Started Guide for procedures for writing iso images to CD (www.redhat.com/docs/manuals/linux/RHL-9-Manual/getting-started-guide/s1-disks-cdrw.html). Or, just try the following command:
# cdrecord -v -pad speed=2 /dev/cdrom /tmp/rescuecd.iso
It's likely that you will be able to record at a higher speed than 2. If you like, you can just skip the speed=2 and let cdrecord determine how fast the drive can write. However, if you find that you are unable to boot the CD you create, you will find that a slower record speed will often fix the problem. Eject the CD when you are done and label it appropriately.
To use the Fedora Core 3 Rescue CD after you have created it, do the following:
Insert the Rescue CD into the CD drive.
Reboot your computer. You will see the Fedora Core 3 Rescue CD welcome screen with the boot: prompt at the bottom.
Press Enter to begin rescue mode. (You could also type linux to begin a Fedora Core install with this CD, or press the F2 function key to see other options.) The rescue CD asks you to choose a language.
Choose a language and select OK. You are asked to choose a keyboard type.
Choose a keyboard type and select OK. You are asked if you want to start network interfaces.
Choose Yes (to start a network interface, if you have a network interface card installed) or No (to continue booting without a network interface).
If you said Yes, choose DHCP, or type in a static IP address and Netmask for your computer. Also, identify your gateway (the machine that connects you to the Internet) and one or more DNS servers you need for address resolution.
When you enter the rescue environment. you need to choose whether or not to mount your Linux installation (under /mnt/sysimage directory) by selecting Continue, to mount it as read-only (select Read-Only), or to not mount it (select Skip).
If everything went well, you should receive the message: Your system is mounted under the /mnt/sysimage directory. You will see a shell prompt. Now you can:
Try to fix any errors in your Linux configuration, beginning at /mnt/sysimage to find your normal root (/) directory.
Backup or transfer files from your computer to other media or computers, if your system remains unbootable, so you can save any critical files.
When you are done, remove the CD and reboot your computer.
Everything you do with the rescue CD you can also do with the Fedora DVD or first CD in your Fedora Core 3 installation CD set. The rescue CD is just more convenient in some cases because it is smaller to copy (only about 74MB as compared with over 4GB for the Fedora DVD) and quicker to boot up. It will also fit on a medium that is smaller than a full-size CD.