Red Hat

Hello all,

I have looked through the forums and I have seen people with this same issue, but none of the fixes have worked for me.

The NFSv4 server is running on Solaris 10. The clients are RHEL 5.4
I am using the NFS server as a high availability storage place for some MQv7 files.

Info prevalent to the problem from other posts:
1. NFSMAPID_DOMAIN is commented out because the resolv.conf files on the client and server do not have the same domain.
2. /etc/dfs/dfstab has "share -F nfs -o rw /export/home/MQHA"
3. I need the mount to be mounted as "mqm:mqm" as that is the user on the client side that must have access to the files for the HA to work. Therefore, I have tried "-o rw=mqm", but when I try to mount it, I get a permission denied response. Trying to mount as the mqm user results in "only root can do that."
4. Both the mqm uid and mqm guid are the same across all 3 servers


I hope I covered everything. The mount command I am using is:
mount -t nfs4 -o hard,intr xx.x.xx.xx:/export/home/MQHA /MQHA

Thanks for any help.

Hi,

Couple of points, as your post alludes to a bit of confusion.

1) The function "-o rw=" is to export r/w to hosts, not to users.

2) Only root can mount an NFS filesystem - this is true. It sounds like all you want is ownership for the mqm user/group over the newly-mounted filesystem. Once you've mounted the filesystem as root, chown mqm:mqm on the mountpoint and this should be what you're looking for (you only need to do the chown once, not every time you mount).

3) Have I misunderstood your problem, and the filesystem is mounted as nobody:nobody?

Here is what is shown:


drwxr-xr-x 25 root root 4096 Jan 14 16:32 .
drwxr-xr-x 25 root root 4096 Jan 14 16:32 ..
-rw-r--r-- 1 root root 0 Jan 14 11:57 .autofsck
-rw-r--r-- 1 root root 0 Feb 23 2010 .autorelabel
drwxr-xr-x 2 root root 4096 Jan 17 15:53 bin
drwxr-xr-x 4 root root 1024 Feb 23 2010 boot
drwxr-xr-x 10 root root 3660 Jan 14 11:57 dev
drwxr-xr-x 101 root root 12288 Jan 27 09:34 etc
drwxr-xr-x 4 root root 4096 Jan 14 14:37 home
drwxr-xr-x 13 root root 4096 Jan 14 13:05 lib
drwx------ 2 root root 16384 Feb 23 2010 lost+found
drwxr-xr-x 2 root root 4096 Jan 14 11:57 media
drwxr-xr-x 2 root root 0 Jan 14 11:57 misc
drwxr-xr-x 2 root root 4096 Aug 8 2008 mnt
drwxrwxr-x 7 nobody nobody 1536 Jan 25 14:46 MQHA
drwxr-xr-x 2 root root 0 Jan 14 11:57 net
drwxr-xr-x 3 root root 4096 Jan 17 15:44 opt
dr-xr-xr-x 112 root root 0 Jan 14 11:56 proc
drwxr-x--- 15 root root 4096 Jan 14 11:55 root
drwxr-xr-x 2 root root 12288 Jan 14 13:08 sbin
drwxr-xr-x 2 root root 4096 Feb 23 2010 selinux
drwxr-xr-x 2 root root 4096 Aug 8 2008 srv
drwxr-xr-x 11 root root 0 Jan 14 11:56 sys
drwxr-xr-x 3 root root 4096 May 19 2009 tftpboot
drwxrwxrwt 5 root root 4096 Jan 27 04:02 tmp
drwxr-xr-x 14 root root 4096 Feb 23 2010 usr
drwxr-xr-x 23 root root 4096 Jan 17 15:44 var
[root@MQfailover /]# chown mqm:mqm MQHA
chown: changing ownership of `MQHA': Invalid argument


the line that is bolded is the mount. at the bottom is the output of the chown attempt.

On the server, can you post the the output of the 'share' command / or the relevant line in /etc/dfs/dfstab.

It would be handy to know how this is exported.

The problem is basically, root uid is "squashed" to nobody, so it looks like the /export/home/MQHA dir is owned by root on the NFS server. The answer would be to chown mqm on the export on the *server*.

the share command outputs:

/export/home/MQHA rw " "

the /etc/dfs/dfstab has:

share -F nfs -o rw /export/home/MQHA

the folder MQHA in /export/home has 775 permissions and mqm:mqm

The folder on the client side, /MQHA, has 775 permissions and is also owned by mqm:mqm

Thanks for the help

I installed a patch for RHEL that is know to potentially cause this problem with the nfs, but it unfortunately did not fix the issue.

Does anyone else have any ideas?

these are the nfs packages that are installed:
rpm -qa | grep nfs
nfs-utils-1.0.9-42.el5
nfs-utils-lib-1.0.8-7.6.el5
nfs-utils-lib-devel-1.0.8-7.6.el5

Thanks.