Fs-images: Difference between revisions
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== How to backup a whole HD == |
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The byte size ''bs'' is useful to do a fast copy, specially then output location is remotly on a network |
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<pre><nowiki> |
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dd if=/dev/sda of=/path/to/store/disk.img bs=4096 |
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</nowiki></pre> |
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To mount a partition from here, you have to consider that you have to ignore partition table. |
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<pre><nowiki> |
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mount -o loop,offset=32256 /path/to/store/disk.img /mnt/mydisk |
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</nowiki></pre> |
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== How to backup only one partition from a HD == |
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<pre><nowiki> |
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dd if=/dev/sda1 of=/path/to/store/disk.img bs=4096 |
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</nowiki></pre> |
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== How to convert a raw image from HD in a VMWare HD image == |
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<pre><nowiki> |
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qemu-img convert -f raw /path/to/image/XPSP2.img -O vmdk /path/to/image/XPSP2.vmdk |
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</nowiki></pre> |
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== How to create a filesystem for CentOS 5 an older distros == |
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One of the issues is grub is unable to read the filesystem, and must of the time is because the recent distros uses 256-byte node size. |
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In order to fix it, specially on VMs, do: |
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# Create the virtual drive as usual |
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<pre><nowiki> |
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# qemu-img create -f raw disk.img 20G |
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</nowiki></pre> |
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# boot using a knoppix image as cdrom |
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<pre><nowiki> |
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# qemu-system-x86_64 -m1024 -hda disk.img -cdrom knoppix.iso -boot d |
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</nowiki></pre> |
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# On knoppix prompt, type ''knoppix 3'', in order to boot in init level 3 |
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# From the shell, start cfdisk and add only one linux partition. |
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# Create the filesyste in the created partition with 128-byte node size |
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<pre><nowiki> |
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# mkfs.ext3 -I 128 /dev/sda1 |
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</nowiki></pre> |
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# Turn off the virtual machine |
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# Now, you can mount the drive as a real physical disk with |
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<pre><nowiki> |
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# mkdir disk |
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# mount -o loop,offset=32256 disk.img disk/ |
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</nowiki></pre> |
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Latest revision as of 05:19, 12 June 2015
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