The magic of ZFS and NFS (2nd try)

[Rainer Duffner]

> Am 20.02.2015 um 20:11 schrieb Christian Baer <christian.baer at uni-dortmund.de>:
> 
> Hi everyone!
> 
> I've already asked this question (basically) in the questions list, but I 
> didn't get anything that really helped me along. I am hoping to get a little 
> further on this list.
> 
> Using my search engines, I have found out that exporting a ZFS is a by 
> picky. However I have found no general rules of what to do - yet.
> 
> My file server is called obelix, my workstation falbala. Feel free to make 
> fun of that fact. :-)
> 
> obelix boots from an SSD. There is a raidz2 configured with 7 HDDs, mounted 
> under /zfs/arc1. This is the main (basic, root) mount point of the ZFS pool 
> and it is pretty much empty. There are other tanks I have defined and they 
> are under /usr/archive/. The directory /usr/archive/ is of course still part 
> of the SSD.
> 
> When I set /usr/archive as an export in /etc/exports, I can mount that from 
> falabala. I see all the subdirectories too - each of these are ZFS tanks. 
> However, I cannot access the contents of the tanks. I've played around here 
> a bit and there are two things that can happen:
> 
> 1. I can dive into the directories but they look empty from falbala.
> 2. Access to the directories is refused completely.
> 
> I don't remember what I did to get each of these results, so please don't 
> ask. :-)
> 
> Ok, so I read that I cannot export all ZFS mounts together like this and 
> have to create an export for each seperately. Fine with me. :-)
> 
> So I created and export to /usr/archive/shared which is the mount point of a 
> ZFS tank. But if I try to mount that via NFS from falbala, the connection is 
> denied completely. This is logged in /var/log/messages on obelix - without 
> any reason however.
> 
> Now it might be that I am just to dumb to understand the works of NFS and 
> ZFS or I am just missing a piece of the puzzle. Can someone please give me a 
> push, please?




You must use the syntax of exports(5) also with zfs set sharenfs=
AFAIK, you shouldn’t use /etc/exports to do zfs exports but the above command

If your hosts you export to are in your nfs-server’s /etc/hosts, you will need to use the names they resolve to also in the exports-statement.
(Though that might be wrong - it was the case with Solaris, though).

uids/gids should match, too, of course.




Rainer