asked on

NFS mount

I have an NFS server which is mounting /home onto another server. I am using NFS 4 to mount the FS

ON server
# cat /etc/exports
/exports *(ro,sync,insecure,root_squash,no_subtree_check,fsid=0)
/exports/home *(rw,nohide,sync,insecure,root_squash,no_subtree_check)

ON client
mount SERVER:/home -o soft -t nfs4 /home_new

I am able to mount fine. But I went ahead and created a file on the server in home
drwxr-x--- 2 root root 4096 Apr 21 18:06 test

On the Client
home_new]# ls -ltr
total 0

I dont see the file, what might be the problem..

farzanj

As I understand you can mount correctly.

In Server file : /etc/export
Comment the first line

Then do
service nfs restart

Then on client
service netfs restart

Then issue this command and show me the output
touch /home/a

mnis2008

ASKER

The command hangs

mnis2008

ASKER

I have used this link as reference
http://www.crazysquirrel.com/computing/debian/servers/setting-up-nfs4.jspx

farzanj

which command hangs?

Make sure you are not accessing the mounted file systems while you are restarting the service.

Also make sure that the exported folder permissions on the server is also correct.

mnis2008

ASKER

The touch command hangs I am still able to mount it.

On the server
# ls -l |grep home
drwxr-xr-x 4 root root 4096 Apr 21 18:06 home

mnis2008

ASKER

here is the error

# touch a
touch: cannot touch `a': Permission denied

mnis2008

ASKER

I figured out some thing, logging as root I am not able to write to the directories but as user I am able to write to those directories

wesly_chen

That's the "root_squash" do:
The root user on clients that connect has the permissions of the user 'nfsnobody'.

mnis2008

ASKER

How do I check it, I have root_squash defined in the exports.

mnis2008

ASKER

Do u think the flags need to be modified in /etc/exports
- rw,nohide,sync,insecure,root_squash,no_subtree_check

mnis2008

ASKER

NFSnobody exits on my server and client

Server - nfsnobody:x:4294967294:4294967294:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

Client - nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

wesly_chen

Since in NFS /etc/exports has "root_squash" set,
so "root" on the client side will be treated as "nfsnobody".

So the permission on client /home
-----------
drwxr-xr-x 4 root root 4096 Apr 21 18:06 home
-----------
User "nfsnobody" has no permission to write. Unless you chmod o+rwx for /exports/home on NFS server

wesly_chen

User "root" has no permission to write since root is "nfsnobody" for this nfs mount.

mnis2008

ASKER

How do I give permissions to root

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wesly_chen

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mnis2008

ASKER

I just learnt that this is an insecure option, But I need this only till I copy some files to the share then I am going to remove the option and just use root_squash.

Thanks Chen