size down moma VM, now that it no longer hosts rabbitmq

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moma has now been shrunk to 20GiB.

Steps:

• Shut down the VM
• Add partitions mappings for the moma disk on beaubourg : kpartx -a -p -part /dev/mapper/drbdvg-vm--103--disk--2
• Shrink the ext4 partition to its minimum size

e2fsck -f /dev/mapper/drbdvg-vm--103--disk--2-part1
resize2fs -M /dev/mapper/drbdvg-vm--103--disk--2-part1

resize2fs tells you the new size of the partition (in that case, 1488401 4k blocks = 5815 MiB)

• Remove partition mappings : kpartx -d -p -part /dev/mapper/drbdvg-vm--103--disk--2
• Shrink the disk partition with fdisk : remove the partition, create a new partition with the same start offset and a size between the resize2fs size and the target disk size (in that case, I chose +15G)
• Shrink the LVM volume to the target size : lvresize -L 20G drbdvg/vm-103-disk-2
• Increase the disk partition size with fdisk to match the disk : remove and create again, using defaults
• Recreate the partition mappings with kpartx
• Increase the ext4 partition size with fsck + resize2fs
• Remove the partition mappings
• Update the VM configuration in /etc/pve with the new disk size
• Reboot the VM.

This task has been migrated to GitLab.