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Resizing XEN images

By Tobias Roeser - Posted on July 8th, 2008
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Another shell snippet I'm looking for regularly...

To resize a block image file (like those that are used as virtual disks in Xen) from 2GB to 10GB you need the following. The used filesystem is ext2/3.

dd if=/dev/zero of=<image file> bs=1M conv=notrunc count=1 seek=10000 
losetup /dev/loop0 <image file>
e2fsck -f /dev/loop0
resize2fs /dev/loop0
e2fsck -f /dev/loop0
losetup -d /dev/loop0

Update: newer versions of e2fsck and resize2fs can handle image files natively, so you don't have to setup a loopback device. The new variant is therefore shorter:

dd if=/dev/zero of=<image file> bs=1M conv=notrunc count=1 seek=10000 
e2fsck -f <image file>
resize2fs <image file>
e2fsck -f <image file>

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