Reducing a Digital Ocean volume in size

Fremantle
2020 February 4 (Tuesday), 8:19AM

For my own future reference:

1. Create new volume.
2. Mount it:

   sudo mount -o discard,defaults,noatime /dev/disk/by-id/scsi-0DO_Volume_data2 /mnt/data2

3. Stop Apache:

   sudo apache2ctl stop

4. Copy everything from old to new with rsync (note trailing slashes):

   rsync -av /mnt/data/ /mnt/data2/

5. Unmount the old volume:

   sudo umount /mnt/data

6. Mount new to old place:

   sudo mount -o discard,defaults,noatime /dev/disk/by-id/scsi-0DO_Volume_data2 /mnt/data

7. Restart Apache:

   sudo apache2ctl start

8. Edit the entry in fstab to use the new volume ID:

   /dev/disk/by-id/scsi-0DO_Volume_data2 /mnt/data2 ext4 defaults,nofail,discard 0 0

9. Remove the temporary mount point:

   sudo rmdir data2/

10. Restart to make sure everything comes back up as it should (this isn't really a good way to do this, but I'm lazy and not many people use this server).

    sudo shutdown -r now