After backing up (step 1) and unmounting (between 2 and 3), run fsck to ensure that the filesystem is healthy:
e2fsck -f /dev/mapper/ExistingExt4
Other than that, the steps are OK.
what should I choose for $SECTORS? Is this step even necessary?
This step is necessary, otherwise the partition would still show up at the old side. This is confirmed with Nautilus, even after resizing with This step is not necessary. It only affects the current size status as shown in the file browser. After changing the size and closing/opening the partition again, the number is restored. So, when closing the LUKS partition as shown later will make this obsolete.resize2fs, the LUKS partition showed up as the old size. After running cryptsetup resize, the correct number is shown.
$SECTORS can be determined by looking at the output of cryptsetup status ExistingExt4:
/dev/mapper/ExistingExt4 is active.
type: LUKS1
cipher: aes-cbc-essiv:sha256
keysize: 256 bits
device: /dev/sda2
offset: 2056 sectors
size: 156049348 sectors
mode: read/write
One sector is always 512 bytes (mentioned in cryptsetup manual page). Thus, to subtract 15 GiB, use a sector size of 156049348 - 15 * 1024 * 1024 * 2 = 124592068:
cryptsetup resize ExistingExt4 -b 124592068
As for resizing the partition, parted works fine with GPT partitions. The resize command does not work however, as a workaround (or solution), remove the partition information and create a new partition as inspired by http://ubuntuforums.org/showthread.php?p=8721017#post8721017:
# cryptsetup luksClose ExistingExt4 # parted /dev/sda2 GNU Parted 2.3 Using /dev/sda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) unit s (parted) p Model: ATA INTEL SSDSA2CW08 (scsi) Disk /dev/sda: 156301488s Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 34s 2082s 2049s Boot bios_grub 3 2083s 250034s 247952s ext2 RootBoot 2 250035s 156301438s 156051404s Everything
As 15 GiB has to be shaved off, the new end becomes 156301438 - 15 * 1024 * 1024 * 2 = 124844158. Since I want to change partition 2, I first have to remove it and then recreate it with the label "Everything" (this could be changed if you like). Note: this disk has a GPT layout. For MBR, you should replace Everything by primary or extended (untested, resizing a partition on MBR has not been tested and is not recommended because it is untested).
WARNING: the following commands has destructed data. Do not copy it without understanding what is happening. The sector dimensions must be changed, otherwise you WILL destroy your partition(s). I am in no way responsible for your stupidness, BACKUP BACKUP BACKUP your data to a second storage medium before risking your data.
(parted) rm 2 (parted) mkpart Everything 250035s 124844158s Warning: The resulting partition is not properly aligned for best performance. Ignore/Cancel? ignore (parted) p Model: ATA INTEL SSDSA2CW08 (scsi) Disk /dev/sda: 156301488s Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 34s 2082s 2049s Boot bios_grub 3 2083s 250034s 247952s ext2 RootBoot 2 250035s 124844158s 124594124s Everything (parted) quit
In the above parted example, my sectors are not aligned which is a mistake from an earlier installation, do not pay too much attention to it.
That is it! You can use cryptsetup status and file -Ls /dev/... to verify that everything is OK and then reboot.