I want to create a disk under CoreOS that is automatically mounted at /var/lib/docker
So I created a var-lib-docker.mount unit file to do it and decided to use the by-label path under /dev/disk.
Initially I found my partitions appear under the by-partlabel path.
It works great however.
In the process I found out that there is a program called e2label, and also under fdisk expert mode I can also create a partition label.
Having not found e2label initially I found I could label partitions with the word "DOCKER" in fdisk. But they actually come through to the path /dev/disk/by-partlabel and not /dev/disk/by-label
What are the differences between these? should one be favoured over the other?
Best Answer
The ArchLinux wiki has (as always) good documentation on this issue. You wrote:
I assume you meant "do NOT come through"? That could be explained by the fact that you created a partition label and your labeled disk should show up under
/dev/disk/by-partlabel/
instead. Once you create a filesystem label (e.g. viae2label
(tune2fs -L
) for ext{2,3,4} file systems), the disk should show up under/dev/disk/by-label
.partition labels are only available for GPT disks. For filesystem labels one would need some filesystem tool to apply a label to the partition. All major on-disk file systems seem to have this (
tune2fs -L
,jfs_tune -L
,xfs_admin -L
,reiserfstune -l
) so unless it's something more exotic, file system labels should work just fine.