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Am Sonntag, 11. November 2007 16:45:31 schrieb Beso: |
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> this way copies everything that is needed to make a system run. i'll make |
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> an example so that you can understand better: |
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> now you have |
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> /dev/hda1 as / |
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> /dev/hda2 as /boot |
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> /dev/hda3 as swap |
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> /dev/hda4 as /usr |
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> /dev/sda1 as /mnt/disk |
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> |
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> when you make cp -a with the system in run (all the partitions mounted |
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> right) you'll get a single partition in /mnt/disk that contains /, /boot |
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> and /usr. |
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> later on you aren't sattisfied with the partition table and decide to move |
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> to the following: |
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> /dev/hda1 /boot |
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> /dev/hda4 extended |
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> /dev/hda5 / |
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> /dev/hda6 /usr |
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> /dev/hda7 /var |
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> /dev/hda8 /tmp |
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> /dev/hda9 /opt |
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> /dev/hda10 swap |
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> /dev/hda11 /home |
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> |
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> all that you'll have to do is boot into some livecd and mount the drives in |
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> some directories (we'll assume in the /mnt) and then mount the external |
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> disk into /mnt/sda. |
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> now all that you have to do is do: |
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> cp -a /mnt/sda/var/* /mnt/var/ |
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> cp -a /mnt/sda/usr/* /mnt/usr/ |
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> . |
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> . |
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> . |
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> cp -a the dirs in their partitions and /etc /mnt /lib /sbin /bin /root /dev |
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> /include /media /mnt /share /sys on the new root partition (these need to |
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> be on the root partition otherwise you cannot boot). |
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> after recopying you go to /etc/fstab and point the new root and other |
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> partitions to the new location following the fstab example inside. |
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> then you only have to reinstall the bootloader. unmount all the partitions, |
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> remount the new root under /mnt/root, remount the new /boot into |
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> /mnt/root/boot and the others partitions in the /mnt/root/[partition] and |
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> the chroot into the new environment with |
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> chroot /mnt/root /bin/bash |
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> do a env-update && source /etc/profile |
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> then type grub |
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> you'll get the grub command line |
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> write root (hd0,0) |
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> then setup (hd0) |
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> quit |
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> then exit, unmount the partitions and reboot |
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> you'll be able to reboot into the old linux with the new partitioning. |
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> this was an example on how the cp -a helps you do a backup of the things |
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> that you have on disk and on how you can use it if you want to modify your |
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> partitioning. obviously, you can also just do a backup and then copy the |
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> stuff on a partition that doesn't boot anymore. |
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> if you change your partition table but you mantain the same hdd and don't |
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> change /boot partition then you don't need to reinstall grub, but only to |
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> repoint your /etc/fstab. |
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> this type of work is better than partimage's one since partimage can only |
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> backup a partition and recopy in the same way it was and you can only do it |
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> |
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> >from partimage, while the cp -a stuff works independently from the linux |
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> |
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> version you're using and on whatever pc you have, since cp is a base linux |
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> command. |
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> |
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Thanks a lot!! |
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