Shrink disk partition image: Difference between revisions
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Shrink your file system to the minimum size. Note that this does not shrink the image file itself. | Shrink your file system to the minimum size. Note: | ||
* that this does not shrink the image file itself. | |||
* that there can be free space between used space that is not freed | |||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
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The filesystem on /dev/loop20 is now 1304407 (4k) blocks long. | The filesystem on /dev/loop20 is now 1304407 (4k) blocks long. | ||
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1304407 * 4 * 1024 bytes = 5342851072 bytes | |||
Disconnect the device: | Disconnect the device: | ||
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sudo losetup -d /dev/loop20 | sudo losetup -d /dev/loop20 | ||
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Truncate the file: | Truncate the file: | ||
Revision as of 22:15, 20 December 2018
Create a copy:
cp org_partition.img new_partition.img
Create a device for the image, note the returned '/dev/loop20' might be different for you:
sudo losetup -f --show new_partition.img /dev/loop20
Check and fix the file system:
sudo e2fsck -f /dev/loop20
Shrink your file system to the minimum size. Note:
- that this does not shrink the image file itself.
- that there can be free space between used space that is not freed
sudo resize2fs -M /dev/loop20 Resizing the filesystem on /dev/loop20 to 1304407 (4k) blocks. The filesystem on /dev/loop20 is now 1304407 (4k) blocks long.
1304407 * 4 * 1024 bytes = 5342851072 bytes
Disconnect the device:
sudo losetup -d /dev/loop20
Truncate the file:
truncate -s 5342851072 new_partition.img
Enlarge the file system again to fit available space:
resize2fs -f new_partition.img The filesystem is already 1304407 (4k) blocks long. Nothing to do!
Check and allow the tool to fix errors:
e2fsck -f new_partition.img Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information Block bitmap differences: -(531654--531655) -(532478--532479) -(857474--858485) Fix<y>? yes Free blocks count wrong for group #16 (815, counted=819). Fix<y>? yes
