Is it possible to mount a directory using a uuid in fstab something like:

UUID, yes, but I have never used it with a directory appended. Normally this would be used so you don't have to reference the drive device designation directly, in case you move it. For example:

No, you need 2 fstab lines. One to mount the file system to /opt and the second as a bind mount to remount /opt to /home/john/opt. As an example using your UUID but may not be exactly as your original fstab

Note that the filesystem mount options maintained by kernel will remain the same as those on the original mount point.

Thanks, but that mounts the (whole) partition on /disk2p2. I'm looking for a way to mount one particular directory on that partition. Using uuid is independent of drive cabling.

Why didn't you just try it ?. You might learn something.

You can not mount a directory within a filesystem without mounting the filesystem itself.

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Thank you michaelk.
My reply was intended to sevendogsbsd . I had not seen your message at that stage.

I have now tried your suggestion (in fstab). It mounted the whole drive in /opt.

My original question may have been miss-leading in that I was presuming it may be a one stage process. /home/john/opt was a test location; if that worked I intended the destination be /opt

I have several OS and decided to have one /opt directory common to all (with frequently updates apps like Firefox, etc)

If I cannot mount only the directory, ie need to mount the drive first, then I may as well use a symlink to "mount" the required directory(?).