How is ownership of tmpfs folders created via /etc/fstab determined?

archuser · 03-09-2015, 01:01 AM

If one defines a tmpfs file system in a folder using fstab like so:

Code:

tmpfs      /mnt/ramdisk tmpfs     defaults,size=4096M 0    0

how are the owner and group decided by the OS?

Assume that /mnt and /mnt/ramdisk are owned by root.

veerain · 03-09-2015, 03:40 AM

With default permissions the unix permissions are 0755.

So the permissions of /mnt/ramdisk would change to 0755, no matter what original permissions of /mnt/ramdisk were.

archuser · 03-09-2015, 05:05 AM

Thanks for the pointer, I'll look into that tonight to get permissions sorted. Any idea why if I specify uid and gid in that fstab entry it is also ignored?

veerain · 03-09-2015, 09:01 AM

Read man page of mount. It has a section on tmpfs.

archuser · 03-09-2015, 01:46 PM

Ok, I've looked at the tmpfs documentation

Changed /etc/fstab to read:

Code:

tmpfs      /mnt/ramdisk tmpfs     size=4096M,mode=0777,uid=998,gid=998 0    0

Yet still the folder is owned by samba and its permissions are:

Quote:

drwxr-xr-x 6 samba samba 300 Mar 7 23:38 ramdisk

How is it that it does not change?

veerain · 03-10-2015, 01:22 AM

Try using the command line instead of fstab. May be some other script is changing after fstab.
Why is it samba because you are using that directory for samba server.