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July 21, 2009

Newsletter/0903 - CentOS Wiki

This issue of Pulse contains some general and security releated news, an interview with CentOS developer Ralph Angenendt and information about 'The Definitive Guide to CentOS' which is a book available in both print and e-book format.
via wiki.centos.org

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July 16, 2009

restore grub installation [Fedora, Centos, RHEL & derivates]

Have you ever found yourself with a non-booting GNU/Linux box?
 
If the cause is a corrupted grub installation (by a bad move on kernel upgrade, a Windows update or whatever) all you have to do is simply:
 

  • set the BIOS of your machine to have CD/DVD-rom player as the 1st boot device; 
  • insert the Fedora/CentOS/RHEL media on it and boot the system, 
  • choose {or manually insert}: linux rescue and press return, 
  • a number of messages will be displayed until you will be taken to a working shell and your old system is mounted on /mnt/sysimage path, 
  • give 'chroot /mnt/sysimage' command to "phisically translate" the shell on your original installation 
  • 'cd /boot/grub' 
  • then check where grub results installed if you have different disks on your machine with a grep '#boot' grub.conf 
  • read the output, verify it's correct eventually with the help of an fdisk -l command, 
  • now you are ready to install grub, after you've choosen the device (or partition) where it sould is located give the command grub-install /dev/device-choosen {ie that could be /dev/sda} 
  • now close the shell and reboot, the system should be working correctly now! 
 
Enjoy ;-)

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