Crash recovery and backup of files

Backup via Legato Networker

• Startup script is /etc/init.d/networker

• Documentation is available via man nsrexecd

• save -v -l incr <directory>

• recover -a <file/directory>

• Ansprechpartner: [mailto:bk@rz.uni-saarland.de Herr Kett], Tel.: 3474

Examples

recover opens an interactive recovery prompt. You can use ls and cd like in a normal shell and version file to see the stored versions of file file.

recover -d restored /home/USER/foo/bar.txt copys the last backup of the file /home/USER/foo/bar.txt to the directory restored.

recover-a -d restored -t 11/28/07 /home/USER/foo/ copys the backup made at 28 November 2007 of the whole directory /home/USER/foo/ to the directory restored.

Crash Recovery Procedure

File server

• Note: Disks and CD-ROM's are in the locker in room 517.

• boot from boot/rescue CD (e.g. RH RescueCD or Knoppix)

• mount floppy labelled "recover grizzly" (e.g. on /mnt/floppy).

• partition hard disk (fdisk) and make file systems on partitions (mke2fs) according to the files on the recover-floppy ([http://www.ps.uni-saarland.de/Internal/system/partiton-table-grizzly.txt partiton-table-grizzly.txt] and [http://www.ps.uni-saarland.de/Internal/system/fstab-grizzly.txt fstab-grizzly.txt]).

• mount the newly created root filesystem (e.g. on /mnt/newroot) and the other filesystems on their places under the new root fs.

• Use the recover binary on the recover-floppy like this:

  • /mnt/floppy/recover -a -s zeus.rz.uni-saarland.de -d /mnt/newroot -q -f /

    Explaination about the different cmdline switches can be found in [http://www.ps.uni-saarland.de/Internal/system/recover-howTo.txt recover-howTo.txt].

• Install LILO bootloader like this:

  • chroot /mnt/newroot lilo -v

• reboot

Client

• boot from boot/rescue CD
• evtually configure network

• partition hard disk (fdisk) and make file systems on partitions (mke2fs). Root fs: 8GB, swap: 1GB, local: rest. If two disks are available sndlocal gets the rest of the first disk, local the complete second one.

• mount the new root filesystem (e.g. on /mnt/newroot) and chdir into it.

• run the following command:

  • ssh -l root ps.uni-saarland.de /root/bin/remote-installer | bash

    You will be asked for the root password on grizzly two times: Once for the above ssh-command, and once for the invoced scp-command copying the .ssh directory of root@grizzly (including its ssh keys) to the HOME on the boot/rescue CD you have booted from. After that, the complete installation runs automagically.

• reboot