NFS mapping NEW user

Voha · 10-30-2013, 09:52 AM

Hi!

I'm (well, me too

) trying to map users from NFS client to server.

I add new user to server, like "useradd -r -u 10000 some_user", and also do the same on client. But it works only after I restart the client. Before restart client see NFS files belonging to nobody (99), after restart all works fine.

Any ideas? Actually it's users for running programs, so restart or even instance mount loose it's not solution... (anyway, umount and the mount doesn't help)

Thanks.

voleg · 10-30-2013, 11:20 AM

Probably you are using NFSv4 (as default for CentOS 6.x),
then it map unknown users to "nobody".
There is a deamon "idmapd" that map users, probaly restart or reload of it may help:

Code:

# /etc/init.d/rpcidmapd
Usage: /etc/init.d/rpcidmapd {start|stop|restart|force-reload|condstart|condrestart|try-restart|status|condstop}

Voha · 10-30-2013, 11:24 AM

I have tried this, doesn't help. ((

voleg · 10-31-2013, 03:48 AM

NFS < v4 was talking UID/GID, when NFSv4 talking user/group, therefore some process to translate required. Probably, server's idmapd should be reloaded too.

As an ultimate solution, you can switch to NFSv3. Locate /etc/sysconfig/nfs file on server and disable v4. All clients should remount.

Code:

# Optional arguments passed to rpc.nfsd. See rpc.nfsd(8)
#RPCNFSDARGS=""
RPCNFSDARGS="--no-nfs-version 4"

Voha · 10-31-2013, 09:24 AM

Quote:

Originally Posted by voleg

Probably, server's idmapd should be reloaded too.

It doesn't help. What helps is just to disable rpcidmapd on server via chkconfig. Thus UIDs from server are passed to client as is. Probably it's not secure for open environment with live users, but I'm talking about close network.