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June 20, 2011

Enlarge a xen Image (.img) File

Filed under: Linux,Uncategorized — Tags: , , , , — admin @ 7:03 pm

This HOWTO will allow you to increase the size of .img files created with dd. Note that this process changes the on-disk image in place and hence it is highly recommended that you back up the image first. Also, make sure the image is not already mounted or backing a live domain or virtual machine! This process is *not* recommended for decreasing the overall size of an image and would likely cause the image itself to be corrupted if attempted.
Replace image_file and size_in_MB appropriately
# dd if=/dev/zero of=image_file bs=1M conv=notrunc count=1 seek=size_in_MB
# losetup /dev/loop0 image_file
# e2fsck -f /dev/loop0
# resize2fs /dev/loop0
# e2fsck -f /dev/loop0
# losetup -d /dev/loop0

1 Comment »

  1. There is no need to setup a loopback device to do this, e2fsck and resie2fs will work on the file directly.

    Comment by Geoffrey McRae — March 30, 2012 @ 12:33 pm

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